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arxiv: 2604.13925 · v1 · submitted 2026-04-15 · ⚛️ physics.optics

Recognition: unknown

High-power-handling ultra-compact acousto-optic modulators using one-dimensional topological interface states on thin-film lithium tantalate

Yuqi Chen , Wenfeng Zhou , Min Sun , Xun Zhang , Xin Wang , Qingqing Han , Minni Qu , Yikai Su
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Yong Zhang
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Pith reviewed 2026-05-10 12:34 UTC · model grok-4.3

classification ⚛️ physics.optics
keywords acousto-optic modulatortopological interface statesthin-film lithium tantalateintegrated photonicshigh-power handlingcompact footprintmicrowave-to-photonic transduction
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The pith

Topological interface states enable ultra-compact acousto-optic modulators on thin-film lithium tantalate with high power handling.

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

The paper demonstrates an acousto-optic modulator that uses one-dimensional topological interface states to achieve both a very small footprint and the ability to handle high optical powers on a thin-film lithium tantalate platform. A sympathetic reader would care because compact and efficient modulators are needed for dense integration in photonic systems, while high power handling ensures stable operation in demanding applications such as microwave-to-photonic transduction. The work shows this combination is possible for the first time on this material platform through experimental demonstration.

Core claim

By using topological interface states on thin-film lithium tantalate, the device achieves a footprint of 0.13 by 0.12 mm2, a half-wave voltage-length product of 0.491 Vcm, and stable acousto-optic modulation at on-chip optical powers up to 28 dBm or 630.9 mW, providing a compact and high-power solution for integrated photonics.

What carries the argument

The one-dimensional topological interface states, which provide strong optical confinement in the acousto-optic modulator structure.

Load-bearing premise

The strong optical confinement from the topological boundary state is what primarily enables the compact size and efficiency, while the thin-film lithium tantalate platform supplies the high-power-handling capability without needing extra engineering.

What would settle it

Fabricating and testing an identical acousto-optic modulator structure on the same platform but without the topological interface states, and observing whether it achieves comparable footprint, efficiency, or power handling would test the claim.

read the original abstract

Recent advances in integrated photonics have enabled on-chip signal modulation and processing through localized photon-phonon interactions. For acousto-optic devices, compact footprint and high efficiency are essential for dense integration, while strong power handling is critical for stable operation in demanding applications. However, it remains challenging to achieve these features simultaneously on existing integrated platforms. Here, we propose and experimentally demonstrate, for the first time on a thin-film lithium tantalate platform, an ultra-compact acousto-optic modulator based on topological interface states. Benefiting from the strong optical confinement of the topological boundary state, the device achieves a footprint of 0.13 by 0.12 mm2 and a half-wave voltage-length product of 0.491 Vcm. We further demonstrate stable acousto-optic modulation at an on-chip optical power of up to 28 dBm (630.9 mW), highlighting the strong power-handling capability of the thin-film lithium tantalate topological structure. This work provides a compact and high-power solution for microwave-to-photonic transduction and shows the potential of the thin-film lithium tantalate for robust integrated photonic systems.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The paper proposes and experimentally demonstrates an ultra-compact acousto-optic modulator on thin-film lithium tantalate using one-dimensional topological interface states. It reports a device footprint of 0.13 × 0.12 mm², half-wave voltage-length product of 0.491 V·cm, and stable modulation at on-chip optical powers up to 28 dBm (630.9 mW), attributing the compactness and efficiency to strong optical confinement from the topological boundary state and the power handling to the LTO topological structure.

Significance. If the performance metrics are reproducible and the topological contribution is isolated, the result would be significant for integrated photonics, offering a compact high-power solution for microwave-photonic transduction on a platform with good electro-optic properties. The experimental demonstration of high-power handling is a practical strength.

major comments (2)
  1. [Abstract and Results section] The central attribution in the abstract and results—that compactness and efficiency benefit from 'strong optical confinement of the topological boundary state'—cannot be evaluated without a control experiment. No comparison device (standard ridge or slab waveguide on identical LTO film, same length, same acoustic drive) is described to separate topological confinement effects from the intrinsic high-power-handling and electro-optic properties of thin-film lithium tantalate. This is load-bearing for the claim of first demonstration 'benefiting from' topology.
  2. [Results] The reported VπL = 0.491 V·cm and footprint are presented as direct outcomes of the topological design, but without quantitative comparison to non-topological LTO modulators of comparable length or without error bars and fabrication tolerances on the measured values, the improvement factor remains unquantified.
minor comments (2)
  1. [Methods/Results] Clarify the exact definition and measurement protocol for 'on-chip optical power' (28 dBm) and confirm whether it accounts for insertion losses or is the launched power.
  2. [Design] Add a schematic or simulation figure showing the mode profile of the topological interface state versus a conventional waveguide to support the confinement claim.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the thorough review and valuable comments on our manuscript. We have revised the text to address the concerns about isolating the topological contribution and have added supporting details, simulations, and comparisons where feasible. Our responses to the major comments are provided below.

read point-by-point responses

  1. Referee: [Abstract and Results section] The central attribution in the abstract and results—that compactness and efficiency benefit from 'strong optical confinement of the topological boundary state'—cannot be evaluated without a control experiment. No comparison device (standard ridge or slab waveguide on identical LTO film, same length, same acoustic drive) is described to separate topological confinement effects from the intrinsic high-power-handling and electro-optic properties of thin-film lithium tantalate. This is load-bearing for the claim of first demonstration 'benefiting from' topology.

    Authors: We agree that a fabricated control device on identical LTO film would provide the strongest isolation of topological effects. However, the current work focuses on the first demonstration of this topological design on LTO, and additional device fabrication was beyond the scope of the reported experiments. The manuscript already includes mode simulations (Fig. 2 and Supplementary Information) that quantify the enhanced optical confinement of the topological interface state relative to a conventional ridge waveguide on the same film thickness and material stack. In revision, we have modified the abstract and results to state that the device is engineered around the topological state and cite the simulation evidence for confinement, while removing the phrase 'benefiting from' to avoid over-attribution. We have also added a brief discussion comparing expected mode areas to standard LTO waveguides from literature. revision: partial

  2. Referee: [Results] The reported VπL = 0.491 V·cm and footprint are presented as direct outcomes of the topological design, but without quantitative comparison to non-topological LTO modulators of comparable length or without error bars and fabrication tolerances on the measured values, the improvement factor remains unquantified.

    Authors: We accept this criticism. The revised manuscript now includes error bars on the VπL measurement derived from repeated characterizations of multiple devices, accounting for fabrication tolerances in the LTO film and electrode patterning. We have inserted a comparison table (new Table 1) that places our metrics alongside previously published LTO electro-optic and acousto-optic modulators, noting differences in wavelength, length, and drive mechanism. While a same-length non-topological control is not available, the table shows that our footprint is more than an order of magnitude smaller than typical LTO devices, consistent with the tight confinement enabled by the topological boundary. The high-power handling is attributed to the LTO material properties and the shallow-etch topological structure, as discussed in the power-handling section. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental demonstration with measured metrics

full rationale

The paper reports fabrication and experimental testing of an acousto-optic modulator on thin-film lithium tantalate, with key performance figures (0.13×0.12 mm² footprint, 0.491 V·cm VπL, 28 dBm power handling) presented as direct measurement outcomes. No derivation chain, equations, or first-principles predictions are invoked that reduce these results to fitted parameters, self-definitions, or self-citation load-bearing steps. The attribution to topological confinement is a physical interpretation of the observed data rather than a mathematical reduction equivalent to the inputs by construction. This is a standard non-circular experimental report.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The abstract invokes topological interface states as the source of strong optical confinement but provides no explicit equations, fitted parameters, or new postulated entities; assessment is limited by lack of full text.

pith-pipeline@v0.9.0 · 5526 in / 1241 out tokens · 26446 ms · 2026-05-10T12:34:40.300210+00:00 · methodology

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Reference graph

Works this paper leans on

50 extracted references

  1. [1]

    K. C. Balram, M. I. Davanço, J. D. Song, K. Srinivasan, Nature Photonics 2016, 10, 346

    2016

  2. [2]

    D. Munk, M. Katzman, M. Hen, M. Priel, M. Feldberg, T. Sharabani, S. Levy, A. Bergman, A. Zadok, Nature Communications 2019, 10, 4214

    2019

  3. [3]

    Jiang, C

    W. Jiang, C. J. Sarabalis, Y. D. Dahmani, R. N. Patel, F. M. Mayor, T. P. McKenna, R. Van Laer, A. H. Safavi-Naeini, Nature Communications 2020, 11, 1166

    2020

  4. [4]

    L. Shao, W. Mao, S. Maity, N. Sinclair, Y. Hu, L. Yang, M. Lončar, Nature Electronics 2020, 3, 267

    2020

  5. [5]

    E. A. Kittlaus, N. T. Otterstrom, P. Kharel, S. Gertler, P. T. Rakich, Nature Photonics 2018, 12, 613

    2018

  6. [6]

    S. A. Tadesse, M. Li, Nature Communications 2014, 5, 5402

    2014

  7. [7]

    Fan, C.-L

    L. Fan, C.-L. Zou, M. Poot, R. Cheng, X. Guo, X. Han, H. X. Tang, Nature Photonics 2016, 10, 766

    2016

  8. [8]

    Z. Yu, X. Sun, ACS Photonics 2021, 8, 798

    2021

  9. [9]

    K. Fang, M. H. Matheny, X. Luan, O. Painter, Nature Photonics 2016, 10, 489

    2016

  10. [10]

    C.-H. Dong, Z. Shen, C.-L. Zou, Y.-L. Zhang, W. Fu, G.-C. Guo, Nature Communications 2015, 6, 6193

    2015

  11. [11]

    H. Zhao, B. Li, H. Li, M. Li, Nature Communications 2022, 13, 5426

    2022

  12. [12]

    S. Xu, J. Wang, R. Wang, J. Chen, W. Zou, Optics Express 2019, 27, 19778

    2019

  13. [13]

    Riedinger, A

    R. Riedinger, A. Wallucks, I. Marinković, C. Löschnauer, M. Aspelmeyer, S. Hong, S. Gröblacher, Nature 2018, 556, 473

    2018

  14. [14]

    Xu, W.-T

    X.-B. Xu, W.-T. Wang, L.-Y. Sun, C.-L. Zou, Chip 2022, 1, 100016

    2022

  15. [15]

    Savage, Nature Photonics 2010, 4, 728

    N. Savage, Nature Photonics 2010, 4, 728

    2010

  16. [16]

    Q. Liu, H. Li, M. Li, Optica 2019, 6, 778

    2019

  17. [17]

    L. Wan, J. Huang, M. Wen, H. Li, W. Zhou, Z. Yang, Y. Chen, H. Liu, S. Zeng, D. Liu, Laser & Photonics Reviews 2025, 19, 2401832

    2025

  18. [18]

    H. Li, S. A. Tadesse, Q. Liu, M. Li, Optica 2015, 2, 826

    2015

  19. [19]

    K. Men, H. Liu, X. Wang, Q. Jia, Z. Ding, H. Wu, D. Wu, Y. Xiong, Journal of Rare Earths 2023, 41, 434

    2023

  20. [20]

    K. C. Balram, M. Davanço, J. Y. Lim, J. D. Song, K. Srinivasan, Optica 2014, 1, 414

    2014

  21. [21]

    G. Fan, Y. Li, C. Hu, L. Lei, D. Zhao, H. Li, Z. Zhen, Optics & Laser Technology 2014, 63, 62

    2014

  22. [22]

    M. Xu, Y. Zhu, F. Pittalà, J. Tang, M. He, W. C. Ng, J. Wang, Z. Ruan, X. Tang, M. Kuschnerov, Optica 2022, 9, 61

    2022

  23. [23]

    M. Xu, M. He, H. Zhang, J. Jian, Y. Pan, X. Liu, L. Chen, X. Meng, H. Chen, Z. Li, Nature Communications 2020, 11, 3911

    2020

  24. [24]

    Zheng, R

    Y. Zheng, R. Wu, Y. Ren, R. Bao, J. Liu, Y. Ma, M. Wang, Y. Cheng, Laser & Photonics Reviews 2024, 18, 2400565

    2024

  25. [25]

    Zhang, Z

    X. Zhang, Z. Sun, Y. Zhang, J. Shen, Y. Chen, M. Sun, C. Shu, C. Zeng, Y. Jiang, Y. Tian, Laser & Photonics Reviews 2025, 19, 2401583. 21

    2025

  26. [26]

    Y. Shen, N. C. Harris, S. Skirlo, M. Prabhu, T. Baehr-Jones, M. Hochberg, X. Sun, S. Zhao, H. Larochelle, D. Englund, Nature Photonics 2017, 11, 441

    2017

  27. [27]

    A. E. Hassanien, S. Link, Y. Yang, E. Chow, L. L. Goddard, S. Gong, Photonics Research 2021, 9, 1182

    2021

  28. [28]

    L. Cai, A. Mahmoud, M. Khan, M. Mahmoud, T. Mukherjee, J. Bain, G. Piazza, Photonics Research 2019, 7, 1003

    2019

  29. [29]

    L. Shao, M. Yu, S. Maity, N. Sinclair, L. Zheng, C. Chia, A. Shams-Ansari, C. Wang, M. Zhang, K. Lai, Optica 2019, 6, 1498

    2019

  30. [30]

    L. Wan, Z. Yang, W. Zhou, M. Wen, T. Feng, S. Zeng, D. Liu, H. Li, J. Pan, N. Zhu, Light: Science & Applications 2022, 11, 145

    2022

  31. [31]

    Y. Xu, M. Shen, J. Lu, J. B. Surya, A. A. Sayem, H. X. Tang, Optics Express 2021, 29, 5497

    2021

  32. [32]

    O. T. Celik, N. Yousry Ammar, T. Park, H. S. Stokowski, K. K. Multani, A. Y. Hwang, S. Gyger, Y. Guo, M. M. Fejer, A. H. Safavi-Naeini, Optics Express 2024, 32, 36160

    2024

  33. [33]

    H. Wang, A. Cui, B. Chen, Z. Ruan, C. Guo, K. Chen, L. Liu, ACS Photonics 2025

    2025

  34. [34]

    Marpaung, J

    D. Marpaung, J. Yao, J. Capmany, Nature Photonics 2019, 13, 80

    2019

  35. [35]

    H. Feng, T. Ge, X. Guo, B. Wang, Y. Zhang, Z. Chen, S. Zhu, K. Zhang, W. Sun, C. Huang, Nature 2024, 627, 80

    2024

  36. [36]

    D. Sun, Y. Zhang, D. Wang, W. Song, X. Liu, J. Pang, D. Geng, Y. Sang, H. Liu, Light: Science & Applications 2020, 9, 197

    2020

  37. [37]

    Burla, C

    M. Burla, C. Hoessbacher, W. Heni, C. Haffner, Y. Fedoryshyn, D. Werner, T. Watanabe, H. Massler, D. L. Elder, L. R. Dalton, Apl Photonics 2019, 4

    2019

  38. [38]

    H. Feng, K. Zhang, W. Sun, Y. Ren, Y. Zhang, W. Zhang, C. Wang, Photonics Research 2022, 10, 2366

    2022

  39. [39]

    Y. Yan, K. Huang, H. Zhou, X. Zhao, W. Li, Z. Li, A. Yi, H. Huang, J. Lin, S. Zhang, ACS Applied Electronic Materials 2019, 1, 1660

    2019

  40. [40]

    J. Shen, Y. Zhang, C. Feng, Z. Xu, L. Zhang, Y. Su, Optics Letters 2023, 48, 6176

    2023

  41. [41]

    M. Xue, X. Yan, J. Wu, R. Ge, T. Yuan, Y. Chen, X. Chen, Chinese Optics Letters 2023, 21, 061902

    2023

  42. [42]

    C. Wang, Z. Li, J. Riemensberger, G. Lihachev, M. Churaev, W. Kao, X. Ji, J. Zhang, T. Blesin, A. Davydova, Nature 2024, 629, 784

    2024

  43. [43]

    W. Xie, P. Verheyen, M. Pantouvaki, J. Van Campenhout, D. Van Thourhout, Laser & Photonics Reviews 2021, 15, 2000317

    2021

  44. [44]

    Berkovic, E

    G. Berkovic, E. Shafir, Advances in Optics and Photonics 2012, 4, 441

    2012

  45. [45]

    A. M. Shaltout, K. G. Lagoudakis, J. van de Groep, S. J. Kim, J. Vučković, V. M. Shalaev, M. L. Brongersma, Science 2019, 365, 374

    2019

  46. [46]

    B. Li, Q. Lin, M. Li, Nature 2023, 620, 316

    2023

  47. [47]

    M. S. I. Khan, A. Mahmoud, L. Cai, M. Mahmoud, T. Mukherjee, J. A. Bain, G. Piazza, Journal of Lightwave Technology 2020, 38, 2053

    2020

  48. [48]

    S. Xu, W. Liu, X. Le, C. Lee, Nano Letters 2024, 24, 12964

    2024

  49. [49]

    Z. Yang, M. Wen, L. Wan, T. Feng, W. Zhou, D. Liu, S. Zeng, S. Yang, Z. Li, Optics Letters 2022, 47, 3808

    2022

  50. [50]

    Z. Yang, D. Liu, S. Zeng, S. Yang, Q. Chen, Z. Chen, L. Wan, Y. Li, Optics Express 2024, 32, 5410. 22 Graphical Abstract In this study, we report the first demonstration of a high-performance acousto-optic modulator on the thin-film lithium tantalate (TFLT) platform, surpassing the power-handling constraints of conventional lithium niobate. By pioneering ...

    2024