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REVIEW 4 major objections 7 minor 43 references

Integrated thin film lithium niobate mid-infrared modulator

T0 review · 4 major / 7 minor · reviewed 2026-08-07 · deepseek-v4-flash

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Pith's one-line read An integrated lithium-niobate modulator brings 20+ GHz speed to the mid-infrared, where molecular spectra live.

desk verdict A real and useful MIR modulator demonstration, but the abstract's '>20 GHz' bandwidth is an extrapolation that should be fixed before publication. read the letter →

arxiv 2505.23632 v2 pith:AYQP4PUC submitted 2025-05-29 physics.optics physics.app-ph

Pierre Didier , Prakhar Jain , Mathieu Bertrand , Jost Kellner , Oliver Pitz , Zhecheng Dai , Mattias Beck , Baile Chen
show 2 more authors
Jérôme Faist Rachel Grange
This is my paper
classification physics.opticsphysics.app-ph
keywords mid-infraredphotonicslithiumniobateonsapphireMach-Zehndermodulatorelectro-opticmodulationfrequencycombgenerationfree-spaceopticalcommunicationintegrated
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper reports the first integrated Mach–Zehnder electro-optic modulator built for the mid-infrared, using thin-film lithium niobate on sapphire. The device works from 3.95 to 4.3 µm, where many pollutant and greenhouse gases have strong absorption lines and where the atmosphere has low-loss windows for free-space communication. It claims a 3 dB bandwidth above 20 GHz, a 34 dB extinction ratio, and a half-wave voltage–length product of 22 V·cm, and it uses these to transmit data at 10 Gbit/s and to generate a frequency comb. The point of the claim is that compact, high-speed, energy-efficient modulators can now be made in a spectral range previously served only by bulky or slow alternatives.

What carries the argument

The central object is a travelling-wave Mach–Zehnder interferometer on the lithium niobate on sapphire platform. Light is split by a multimode interferometer into two waveguide arms inside a ground–signal–ground coplanar microwave line; a voltage applied along the travelling electrode produces opposite phase shifts in the two arms through the Pockels effect ($\chi^{(2)}$), and the arms recombine to give amplitude modulation. A thermal phase shifter on one arm biases the device at quadrature, and the relatively thick (1.5 µm) lithium niobate film keeps the optical mode confined so the electrodes can sit close without plasmonic loss. The $V_\pi L$ of 22 V·cm and the flat 20 GHz response are both consequences of this electrode/waveguide geometry.

What would settle it

Measure the electro-optic S21 of the same 1.5 µm-film modulator with a setup that reaches 40 GHz or more (a faster VNA and a faster photodetector). If the response drops by 3 dB at or below 20 GHz, or shows a resonance or impedance mismatch just above 20 GHz, the bandwidth claim in the abstract is wrong.

Watch

Extended reading notes

Core claim

On a lithium niobate on sapphire platform, the authors build a travelling-wave Mach–Zehnder modulator whose two arms sit between ground–signal–ground electrodes, so the Pockels effect creates an antisymmetric refractive-index shift and converts an applied voltage into amplitude modulation. They report operation over a 300 nm band centred near 4 µm, a $V_\pi L$ of 22.4 V·cm, an extinction ratio of 34.1 dB, and a total insertion loss of 14.1 dB. The high-speed S21 response is flat to 20 GHz, which the authors take to mean the intrinsic 3 dB bandwidth likely exceeds 20 GHz; with this device they demonstrate 10 Gbit/s transmission with a bit error rate below 5×10⁻⁵ and an optical frequency comb about 80 GHz wide. They also show full π-phase modulation, which they identify as a missing capability for integrated mid-infrared photonics. The thicker 1.5 µm film confines the optical mode more tightly and gives a lower $V_\pi L$ than the 0.9 µm film, pointing to a design direction for even lower drive voltages.

Load-bearing premise

The load-bearing assumption is that the modulator's frequency response stays flat beyond 20 GHz: the measured S21 curve is flat only up to 20 GHz, which is the combined limit of the vector network analyzer and photodetector, so the 'exceeding 20 GHz' bandwidth is an extrapolation rather than a direct measurement.

Editorial extensions

If this is right

  • A compact MIR modulator with multi-gigahertz bandwidth and 34 dB contrast makes integrated high-speed spectroscopy practical, where modulation depth and speed have been the bottleneck.
  • The 10 Gbit/s link demonstrates that the device can carry real data in the 3–5 µm atmospheric window; faster drivers should push the bit rate higher since the optical bandwidth is not the limit.
  • The 80 GHz-wide frequency comb generated by amplitude modulation offers a path to integrated MIR comb sources without bulky tabletop systems.
  • Full π-phase modulation at 4 µm unlocks coherent sensing and phase-encoded free-space links on a chip, beyond simple intensity modulation.
  • The better confinement of the 1.5 µm film reduces $V_\pi L$ below 20 V·cm, so further electrode optimization can cut drive voltage and power.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the flat S21 response really extends past 20 GHz, the same travelling-wave design should reach several tens of gigahertz with only RF packaging changes, because nothing in the measured response hints at an intrinsic roll-off.
  • The transparency cutoff near 4.5 µm, where propagation loss jumps to 7.7 dB/cm, sets a hard upper limit for this platform; the practical modulator window will be the 3.95–4.3 µm range demonstrated unless the material stack is modified.
  • Because the modulation is based on the Pockels effect rather than carrier injection, the device should have the intrinsic speed to generate mid-infrared pulses in the tens-of-picoseconds range when driven by a suitable RF source, a capability the paper mentions as future work.
  • Combining this modulator with lithium niobate's Kerr nonlinearity could produce integrated MIR Kerr combs, a direction the authors state as a next step.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 7 minor

Summary. The manuscript reports an integrated Mach–Zehnder electro-optic modulator on the lithium niobate on sapphire (LNOS) platform operating near 4 µm. The authors present static characterization (VπL ≈ 22 V·cm, extinction ratio ≈ 34 dB, insertion loss 14.1 dB, operation from 3.95 to 4.3 µm), high-frequency S21 measurements up to 20 GHz, a 10 Gbit/s data transmission experiment, and frequency comb generation with ~7 GHz sideband spacing. The central claims are that this is the first integrated MIR MZM and that its 3 dB bandwidth exceeds 20 GHz, with the broader goal of establishing LNOS as a platform for high-speed MIR photonics.

Significance. If fully substantiated, the work would be an important step for the mid-infrared: a thin-film lithium niobate modulator with high extinction ratio, low VπL, and multi-gigahertz operation would enable compact spectrometers, sensors, and free-space communication systems. The static characterization is direct and convincing, the VπL values agree reasonably with simulation, the fabrication details are concrete, and the 10 Gbit/s eye diagram plus frequency comb demonstrations add practical value. The main weakness is that the headline bandwidth number is an extrapolation rather than a measured 3 dB roll-off, and the detector calibration is performed at 1550 nm while the modulator operates near 4 µm. These issues affect the central performance claim and need to be addressed or reworded.

major comments (4)
  1. [§2.3, Fig. 4b, Abstract] The statement that the modulator has a '3 dB bandwidth exceeding 20 GHz' is not directly supported by the data. The measured S21 trace is flat only up to 20 GHz, which coincides with the VNA limit (Keysight P5004A, §4.6), the driver amplifier bandwidth (~20 GHz), and the packaged photodetector bandwidth of 20.3 GHz (Appendix D). The text itself says the true bandwidth 'likely exceeds 20 GHz', but the abstract reports it as a definite fact. Please either report a measured lower bound ('≥20 GHz') or extend the measurement with a higher-bandwidth VNA, driver, and detector; otherwise the headline number remains an extrapolation.
  2. [§4.6, Appendix D] The normalization procedure for the S21 data is a second concern. The detector's frequency response was measured independently with a 1550 nm lightwave component analyzer and then divided out of the 4 µm S21 response. A photodetector's high-speed response can depend on wavelength through the absorption profile, carrier generation depth, and transit time; if the 4 µm response rolls off before the 1550 nm calibration, the corrected S21 would appear artificially flat. Please quantify this wavelength dependence, for example by measuring the detector frequency response at 4 µm or by validating with an independent high-speed detector, and state the resulting uncertainty in the bandwidth claim.
  3. [§1 and Ref. [19,21]] The priority claim that this is 'the first photonic integrated MZM demonstrated in the MIR' should be reconciled with the previously reported integrated MIR modulators cited as Refs. [19] and [21]. If those devices are not Mach–Zehnder modulators, the text should say so explicitly; if they are, the claim should be qualified (e.g., first thin-film lithium niobate MZM in the MIR). The current comparison to the review Ref. [34] alone does not justify the unqualified 'first' statement.
  4. [Abstract and §2.3] The 'full π-phase modulation' claim, repeated in the abstract and the introduction, is inferred from the MZM transmission curve rather than from a direct phase measurement. Since a π phase difference between arms is needed to reach extinction, the inference is reasonable, but the wording should make clear that this is extracted from the Vπ measurement rather than demonstrated as an independent phase characterization.
minor comments (7)
  1. [Fig. 4 and §2.3] The text refers to the eye diagram as Fig. 4c and the frequency comb as Fig. 4d, but the figure captions label them in the opposite order (c = comb, d = transmission). Please swap either the panels or the references.
  2. [Fig. 3b and §2.2] The caption of Fig. 3b says 'exhibiting a Vπ of 28 V.cm'; Vπ is a voltage, so this should read 'a Vπ of 28 V' (with VπL = 22 V·cm). In addition, the electrode gap is given as 10.5 µm in the text and 11 µm in the caption; please harmonize these values.
  3. [Abstract, §1, §2.2] The output power is described as 'half-milliwatt level' in the abstract and 'exceeding half a milliwatt' in the introduction, but §2.2 reports a modulated output power of 350 µW. Please state one consistent, accurate value.
  4. [Fig. 4c caption and §4.6] The caption says the comb was generated using '40 dBm amplitude modulation', which corresponds to 10 W and is inconsistent with the ~20 dBm driver amplifier described in §4.6. Please correct the power value or the units.
  5. [Abstract and §2.3] The abstract states a comb width of 80 GHz, while §2.3 describes '8 visible sidebands spaced by 7 GHz' and also mentions 'ten distinct spectral lines'. Please clarify the number of lines and how the 80 GHz width is obtained.
  6. [§4.1] The methods text says the chips were fabricated from a wafer with a '900 or 1500-µm LN layer'; this should be 900 nm or 1500 nm. The same section later correctly uses '0.9-µm-thick and 1.5-µm'.
  7. [§4.2] There is a typo: 'Electro-optic simulations using using multiphysics and FDTD software'. Please remove the duplicated word.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: the reported performances are direct measurements, with the only caveat being an extrapolated bandwidth that is a measurement-range limitation, not a circular derivation.

full rationale

The paper reports experimental device characterization: static V_pi and extinction ratio from transmission curves, high-speed S21 traces, eye-diagram/BER measurements, and optical spectra. None of these central claims is derived from a fitted parameter that is then renamed as a prediction; the V_pi value is extracted from a measured cos^2 response, the extinction ratio is read directly from the transmission minimum/maximum, and the 10 Gbit/s and comb results are direct measurements. The only soft point is the abstract's statement of a '3 dB bandwidth exceeding 20 GHz', while Section 2.3 states 'These results suggest that the actual 3 dB bandwidth of the modulator likely exceeds 20 GHz' and notes that the measurement is limited by the VNA and detector bandwidth. That is an extrapolation beyond the measurement range, and the normalization uses a detector frequency response measured at 1550 nm rather than at 4 um. This is a legitimate experimental-correctness concern, but it is not circularity: the bandwidth is not defined in terms of a fitted input, nor does any equation reduce to an earlier assumption. The self-citations (e.g., refs. 14, 18, 42, 43) concern background on directly modulated interband cascade lasers and the photodetector's on-chip bandwidth; they provide context or supporting component data, but they are not the load-bearing derivation of the modulator's performance. The modulator's own V_pi, extinction ratio, S21 flatness, eye diagram, and comb sidebands are independently measured in this work. Therefore no step in the claimed derivation chain is equivalent to its own input by construction.

Assumptions & free parameters 0 free parameters · 2 assumptions · 0 invented entities

The central claims are experimental measurements. The design relies on standard lithium niobate electro-optic coefficients and sapphire transparency in the MIR; these are taken from prior literature and not re-derived.

assumptions (2)
  • domain assumption The Pockels electro-optic coefficient of x-cut lithium niobate at 4 μm is the same as at shorter wavelengths (approximately 33 pm/V, from ref 27).
    The modulator's phase shift depends on the LN Pockels coefficient; the paper does not measure r at 4 μm but uses literature values.
  • domain assumption Sapphire is transparent and low-absorption in the 3.95 to 4.3 μm range, extending LN transparency beyond the SiO2 absorption limit.
    The LNOS platform's advantage over LNOI depends on sapphire having negligible absorption in this band, as cited from ref 32.

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Cite this review

Pith. "Pith review of Integrated thin film lithium niobate mid-infrared modulator." pith.science (2026). https://pith.science/paper/AYQP4PUC

@misc{pith2026250523632,
  author       = {Pith},
  title        = {Pith review of: Integrated thin film lithium niobate mid-infrared modulator},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/AYQP4PUC}},
  note         = {Machine review of arXiv:2505.23632}
}
abstract

The mid-infrared spectral range holds great promise for applications such as molecular spectroscopy and telecommunications. Many key molecules exhibit strong absorption features in this range, and free-space optical communication benefits from reduced atmospheric attenuation and low transmission losses in specific wavelength bands spanning from 3 to 14 $\mu m$. Recent progress in MIR photonics has been fuelled by the rapid development of efficient light sources and detectors. However, further advancement is hindered by the lack of low-loss, high-performance integrated photonic platforms and modulators. Lithium niobate on sapphire is a promising candidate, operating across a broad spectral range from 0.4 $\mu m$ to 4.5 $\mu m$. We demonstrate a broadband, high-speed lithium niobate on sapphire Mach-Zehnder electro-optic modulator operating from 3.95 to 4.3 $\mu m$. The device achieves a 3 dB bandwidth exceeding 20 GHz, an extinction ratio of 34 dB, and a half-wave voltage of 22 V$\cdot$cm, delivering optical output power at the half-milliwatt level. These properties are leveraged to demonstrate data transmission at 10 Gbit/s. The modulator is also used to generate a frequency comb with a width of 80 GHz. Furthermore, we demonstrate full $\pi$-phase modulation in the MIR, representing a key milestone for integrated MIR photonics. These results establish a pathway toward high-speed, energy-efficient MIR photonic systems for applications in telecommunications, sensing, and quantum technologies.

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Works this paper leans on

43 extracted references · 43 canonical work pages

  1. [19]

    Photonics Research7(8), 828–836 (2019)

    Li, T., Nedeljkovic, M., Hattasan, N., Cao, W., Qu, Z., Littlejohns, C.G., Penades, J.S., Mastronardi, L., Mittal, V., Benedikovic, D.,et al.: Ge-on-si modulators operating at mid-infrared wavelengths up to 8µm. Photonics Research7(8), 828–836 (2019)

    work page 2019

  2. [21]

    ACS photonics9(1), 249–255 (2022)

    Montesinos-Ballester, M., Deniel, L., Koompai, N., Nguyen, T.H.N., Frigerio, J., Ballabio, A., Falcone, V., Le Roux, X., Alonso-Ramos, C., Vivien, L.,et al.: Mid- infrared integrated electro-optic modulator operating up to 225 mhz between 6.4 and 10.7µm wavelength. ACS photonics9(1), 249–255 (2022)

    work page 2022

  3. [34]

    Nanophotonics 12(19), 3683–3706 (2023)

    Xu, T., Dong, Y., Zhong, Q., Zheng, S., Qiu, Y., Zhao, X., Jia, L., Lee, C., Hu, T.: Mid-infrared integrated electro-optic modulators: a review. Nanophotonics 12(19), 3683–3706 (2023)

    work page 2023

  4. [1]

    Laser Communication and Propagation through the Atmosphere and Oceans VIII11133, 1113302 (2019)

    Liu, J.J., Stann, B.L., Klett, K.K., Cho, P.S., Pellegrino, P.M.: Mid and long- wave infrared free-space optical communication. Laser Communication and Propagation through the Atmosphere and Oceans VIII11133, 1113302 (2019)

    work page 2019

  5. [2]

    IEEE Journal of Selected Topics in Quantum Electronics28(1), 1–9 (2021)

    Spitz, O., Didier, P., Durupt, L., D ´ ıaz-Thomas, D.A., Baranov, A.N., Cerutti, L., Grillot, F.: Free-Space Communication with Directly Modulated Mid-Infrared Quantum Cascade Devices. IEEE Journal of Selected Topics in Quantum Electronics28(1), 1–9 (2021)

    work page 2021

  6. [3]

    Optics Express17(6), 4355–4359 (2009)

    Corrigan, P., Martini, R., Whittaker, E.A., Bethea, C.: Quantum cascade lasers and the Kruse model in free space optical communication. Optics Express17(6), 4355–4359 (2009)

    work page 2009

  7. [4]

    In: Laser Communication and Propagation Through the Atmosphere and Oceans VIII, vol

    Liu, J.J., Stann, B.L., Klett, K.K., Cho, P.S., Pellegrino, P.M.: Mid and long- wave infrared free-space optical communication. In: Laser Communication and Propagation Through the Atmosphere and Oceans VIII, vol. 11133, p. 1113302 (2019). International Society for Optics and Photonics

    work page 2019

  8. [5]

    IEEE Photonics J.9(1) (2017)

    Esmail, M.A., Ragheb, A., Fathallah, H., Alouini, M.S.: Investigation and Demon- stration of High Speed Full-Optical Hybrid FSO/Fiber Communication System under Light Sand Storm Condition. IEEE Photonics J.9(1) (2017)

    work page 2017

Show all 43 references
  1. [6]

    Haas, J., Mizaikoff, B.: Advances in mid-infrared spectroscopy for chemical analysis. Annu. Rev. Anal. Chem9(1), 45–68 (2016)

    2016

  2. [7]

    Applied spectroscopy68(10), 1095–1107 (2014) 17

    Zhang, L., Tian, G., Li, J., Yu, B.: Applications of absorption spectroscopy using quantum cascade lasers. Applied spectroscopy68(10), 1095–1107 (2014) 17

    2014

  3. [8]

    Applied optics42(33), 6728–6738 (2003)

    Schilt, S., Thevenaz, L., Robert, P.: Wavelength modulation spectroscopy: com- bined frequency and intensity laser modulation. Applied optics42(33), 6728–6738 (2003)

    2003

  4. [9]

    Science264(5158), 553–556 (1994)

    Faist, J., Capasso, F., Sivco, D.L., Sirtori, C., Hutchinson, A.L., Cho, A.Y.: Quantum cascade laser. Science264(5158), 553–556 (1994)

    1994

  5. [10]

    Applied physics letters67(6), 757–759 (1995)

    Meyer, J., Hoffman, C., Bartoli, F., Ram-Mohan, L.: Type-II quantum-well lasers for the mid-wavelength infrared. Applied physics letters67(6), 757–759 (1995)

    1995

  6. [11]

    Applied physics letters71(17), 2409–2411 (1997)

    Yang, R.Q., Yang, B., Zhang, D., Lin, C.-H., Murry, S., Wu, H., Pei, S.: High power mid-infrared interband cascade lasers based on type-ii quantum wells. Applied physics letters71(17), 2409–2411 (1997)

    1997

  7. [12]

    Nature Communications15(1), 8040 (2024)

    Dely, H., Joharifar, M., Durupt, L., Ostrovskis, A., Schatz, R., Bonazzi, T., Maisons, G., Gacemi, D., Salgals, T., Zhang, L.,et al.: Unipolar quantum optoelectronics for high speed direct modulation and transmission in 8–14µm atmospheric window. Nature Communications15(1), 80...

    2024

  8. [13]

    Optics express24(4), 3294–3312 (2016)

    Hinkov, B., Hugi, A., Beck, M., Faist, J.: Rf-modulation of mid-infrared dis- tributed feedback quantum cascade lasers. Optics express24(4), 3294–3312 (2016)

    2016

  9. [14]

    Photonics Research11(4), 582–590 (2023)

    Didier, P., Kn¨ otig, H., Spitz, O., Cerutti, L., Lardschneider, A., Awwad, E., Diaz-Thomas, D., Baranov, A., Weih, R., Koeth, J.,et al.: Interband cascade technology for energy-efficient mid-infrared free-space communication. Photonics Research11(4), 582–590 (2023)

    2023

  10. [15]

    APL Photonics9(11) (2024)

    Bonazzi, T., Dely, H., Didier, P., Gacemi, D., Fix, B., Beck, M., Faist, J., Harouri, A., Sagnes, I., Grillot, F., et al.: Metamaterial unipolar quantum optoelectronics for mid-infrared free-space optics. APL Photonics9(11) (2024)

    2024

  11. [16]

    Nature communications12(1), 1–6 (2021)

    Pirotta, S., Tran, N.-L., Jollivet, A., Biasiol, G., Crozat, P., Manceau, J.-M., Bousseksou, A., Colombelli, R.: Fast amplitude modulation up to 1.5 GHz of mid-IR free-space beams at room-temperature. Nature communications12(1), 1–6 (2021)

    2021

  12. [17]

    Laser & Photonics Reviews16(2) (2022)

    Dely, H., Bonazzi, T., Spitz, O., Rodriguez, E., Gacemi, D., Todorov, Y., Pantzas, K., Beaudoin, G., Sagnes, I., Li, L., et al.: 10 Gbit·s-1 free space data transmission at 9 um wavelength with unipolar quantum optoelectronics . Laser & Photonics Reviews16(2) (2022)

    2022

  13. [18]

    Advanced Photonics4(5), 056004–056004 (2022) 18

    Didier, P., Dely, H., Bonazzi, T., Spitz, O., Awwad, E., Rodriguez, ´E., Vasanelli, A., Sirtori, C., Grillot, F.: High-capacity free-space optical link in the midin- frared thermal atmospheric windows using unipolar quantum devices. Advanced Photonics4(5), 056004–056004 (2022) 18

    2022

  14. [20]

    Optics Letters44(4), 915–918 (2019)

    Nedeljkovic, M., Littlejohns, C.G., Khokhar, A.Z., Banakar, M., Cao, W., Penades, J.S., Tran, D.T., Gardes, F.Y., Thomson, D.J., Reed, G.T.,et al.: Silicon-on-insulator free-carrier injection modulators for the mid-infrared. Optics Letters44(4), 915–918 (2019)

    2019

  15. [22]

    Nature Communications13(1), 7662 (2022)

    Zou, K., Pang, K., Song, H., Fan, J., Zhao, Z., Song, H., Zhang, R., Zhou, H., Minoofar, A., Liu, C.,et al.: High-capacity free-space optical communications using wavelength-and mode-division-multiplexing in the mid-infrared region. Nature Communications13(1), 7662 (2022)

    2022

  16. [23]

    Journal of Lightwave Technology (2024)

    Zhou, H., Duan, Y., Ramakrishnan, M., Jiang, Z., Su, X., Zou, K., Heinige, A.T., Tur, M., Willner, A.E.: Demonstration of an Optical Parametric Oscilla- tor (OPO)-based High-Power Data Transmitter for a 10-Gbit/s QPSK Mid-IR Coherent Free-Space Link through Fog. Journal of Lig...

    2024

  17. [24]

    Optics Express31(19), 30876–30883 (2023)

    Dely, H., Chomet, B., Bonazzi, T., Gacemi, D., Vasanelli, A., Evirgen, A., Lopez, O., Darqui´ e, B., Kapsalidis, F., Faist, J.,et al.: Heterodyne coherent detection of phase modulation in a mid-infrared unipolar device. Optics Express31(19), 30876–30883 (2023)

    2023

  18. [25]

    Advanced Science, 2207520 (2023)

    Chung, H., Hwang, I., Yu, J., Boehm, G., Belkin, M.A., Lee, J.: Electrical phase modulation based on mid-infrared intersubband polaritonic metasurfaces. Advanced Science, 2207520 (2023)

    2023

  19. [26]

    Nano letters17(5), 3027–3034 (2017)

    Sherrott, M.C., Hon, P.W., Fountaine, K.T., Garcia, J.C., Ponti, S.M., Brar, V.W., Sweatlock, L.A., Atwater, H.A.: Experimental demonstration of¿ 230 phase modulation in gate-tunable graphene–gold reconfigurable mid-infrared metasurfaces. Nano letters17(5), 3027–3034 (2017)

    2017

  20. [27]

    In: Springer Handbook of Atomic, Molecular, and Optical Physics, pp

    Boyd, R.W., Gaeta, A.L., Giese, E.: Nonlinear optics. In: Springer Handbook of Atomic, Molecular, and Optical Physics, pp. 1097–1110. Springer, ??? (2008)

    2008

  21. [28]

    Advanced Photonics4(3), 030502–030502 (2022)

    Xie, Z., Zhu, S.: Linbo3 crystals: from bulk to film. Advanced Photonics4(3), 030502–030502 (2022)

    2022

  22. [29]

    Nature562(7725), 101–104 (2018)

    Wang, C., Zhang, M., Chen, X., Bertrand, M., Shams-Ansari, A., Chandrasekhar, S., Winzer, P., Lonˇ car, M.: Integrated lithium niobate electro-optic modulators 19 operating at cmos-compatible voltages. Nature562(7725), 101–104 (2018)

    2018

  23. [30]

    Nature communications11(1), 3911 (2020)

    Xu, M., He, M., Zhang, H., Jian, J., Pan, Y., Liu, X., Chen, L., Meng, X., Chen, H., Li, Z.,et al.: High-performance coherent optical modulators based on thin-film lithium niobate platform. Nature communications11(1), 3911 (2020)

    2020

  24. [31]

    Journal of Optics A: Pure and Applied Optics 8(10), 840 (2006)

    Soref, R.A., Emelett, S.J., Buchwald, W.R.: Silicon waveguided components for the long-wave infrared region. Journal of Optics A: Pure and Applied Optics 8(10), 840 (2006)

    2006

  25. [32]

    Optica8, 921–924 (2021)

    Mishra, J., McKenna, T.P., Ng, E., Stokowski, H.S., Jankowski, M., Langrock, C., Heydari, D., Mabuchi, H., Fejer, M.M., Safavi-Naeini, A.H.: Mid-infrared nonlinear optics in thin-film lithium niobate on sapphire. Optica8, 921–924 (2021)

    2021

  26. [33]

    Sapphire, 55–176 (2009)

    Dobrovinskaya, E.R., Lytvynov, L.A., Pishchik, V.: Properties of sapphire. Sapphire, 55–176 (2009)

    2009

  27. [35]

    Nanophoton- ics12(8), 1601–1611 (2023)

    Kaufmann, F., Finco, G., Maeder, A., Grange, R.: Redeposition-free inductively- coupled plasma etching of lithium niobate for integrated photonics. Nanophoton- ics12(8), 1601–1611 (2023)

    2023

  28. [36]

    Nature492(7428), 229–233 (2012)

    Hugi, A., Villares, G., Blaser, S., Liu, H., Faist, J.: Mid-infrared frequency comb based on a quantum cascade laser. Nature492(7428), 229–233 (2012)

    2012

  29. [37]

    Science382(6669), 434–438 (2023)

    Heckelmann, I., Bertrand, M., Dikopoltsev, A., Beck, M., Scalari, G., Faist, J.: Quantum walk comb in a fast gain laser. Science382(6669), 434–438 (2023)

    2023

  30. [38]

    Nature Photonics9(11), 721–724 (2015)

    Pupeza, I., S´ anchez, D., Zhang, J., Lilienfein, N., Seidel, M., Karpowicz, N., Paasch-Colberg, T., Znakovskaya, I., Pescher, M., Schweinberger, W.,et al.: High-power sub-two-cycle mid-infrared pulses at 100 mhz repetition rate. Nature Photonics9(11), 721–724 (2015)

    2015

  31. [39]

    Micromachines13(12), 2063 (2022)

    Wang, F., Qi, X., Chen, Z., Razeghi, M., Dhillon, S.: Ultrafast pulse generation from quantum cascade lasers. Micromachines13(12), 2063 (2022)

    2022

  32. [40]

    Nature Photonics15(12), 919–924 (2021)

    T¨ aschler, P., Bertrand, M., Schneider, B., Singleton, M., Jouy, P., Kapsalidis, F., Beck, M., Faist, J.: Femtosecond pulses from a mid-infrared quantum cascade laser. Nature Photonics15(12), 919–924 (2021)

    2021

  33. [41]

    Nature, 1–7 (2025) 20

    Kazakov, D., Letsou, T.P., Piccardo, M., Columbo, L.L., Brambilla, M., Prati, F., Dal Cin, S., Beiser, M., Opaˇ cak, N., Ratra, P., et al.: Driven bright solitons on a mid-infrared laser chip. Nature, 1–7 (2025) 20

    2025

  34. [42]

    IEEE Electron Device Letters43(5), 745–748 (2022)

    Huang, J., Shen, Z., Wang, Z., Zhou, Z., Wang, Z., Peng, B., Liu, W., Chen, Y., Chen, B.: High-speed mid-wave infrared uni-traveling carrier photodetector based on InAs/InAsSb type-II superlattice. IEEE Electron Device Letters43(5), 745–748 (2022)

    2022

  35. [43]

    In: 2022 IEEE Photonics Conference (IPC), pp

    Dai, Z., Huang, J., Chen, B.: Mwir inas/inassb type-ii superlattice photodetector for high-speed operation. In: 2022 IEEE Photonics Conference (IPC), pp. 1–2 (2022). IEEE 21

    2022

Pith tools

Reviewed August 7, 2026 · model on record in the stance chip above.