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REVIEW 3 major objections 3 minor 2 cited by

Periodically Poled Piezoelectric Lithium Niobate Resonator for Piezoelectric Power Conversion

T0 review · 3 major / 3 minor · reviewed 2026-08-05 · deepseek-v4-flash

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Pith's one-line read A two-layer lithium niobate resonator reaches 19.23 MHz with Q of 3187 and 29% coupling.

desk verdict Real device progress with inflated headline numbers: the P3F A2-mode demonstration is worth refereeing, but Q=3187 and k2=29% don't hold up against the paper's own data. read the letter →

arxiv 2508.09407 v1 pith:URUP6YRX submitted 2025-08-13 physics.app-ph

Ziqian Yao , Clarissa Daniel , Lezli Matto , Heather Chang , Vakhtang Chuluhadze , Michael Liao , Jack Kramer , Eric Stolt
show 3 more authors
Mark S. Goorsky Juan Rivas-Davila Ruochen Lu
This is my paper
classification physics.app-ph
keywords periodicallypoledpiezoelectricfilmlithiumniobatethickness-extensionalresonatorpowerconversionelectromechanicalcouplingqualityfactorwaferbondinghigh-powertesting
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

Periodically poled piezoelectric film (P3F) structures—two lithium niobate layers bonded with opposite crystal polarity—can excite the second-order antisymmetric thickness-extensional (A2) mode that a single-layer resonator suppresses. The paper reports the first P3F lithium niobate resonator built for power conversion, operating at 19.23 MHz with a claimed electromechanical coupling of 29% and a quality factor of 3187. If these values hold, the device achieves the highest frequency-times-quality product among reported piezoelectric power resonators, opening a path to smaller, higher-frequency power converters that replace magnetic inductors with vibrating crystals. The paper also documents thermal behavior to 150°C and a high-power failure study up to 58 dBm.

What carries the argument

The periodically poled piezoelectric film (P3F) stack: two lithium niobate layers bonded face-to-face with opposite crystal orientation, so piezoelectric coefficients odd under inversion (e33, e31, e32) flip sign across the interface. This alternating polarity is the mechanism that selectively couples even-order antisymmetric thickness modes (A2, A6) while cancelling odd-order symmetric modes (S1), enabling higher resonance frequencies with a thicker film stack.

What would settle it

Measure the device impedance at low input power and recompute k2 from the series and parallel resonance frequencies with the IEEE-176 effective coupling formula; if k2 comes out near 19% rather than 29%, or if the quality factor from the 3-dB bandwidth is 1282 instead of the smoothed BodeQ peak of 3187, the state-of-the-art fs·Q claim does not hold.

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Extended reading notes

Core claim

The central claim is that reversing the piezoelectric polarity between two bonded 36° Y-cut lithium niobate layers lets a thickness-extensional resonator couple strongly to its second-order antisymmetric (A2) overtone, instead of the fundamental symmetric (S1) mode. In a single layer, opposing stress phases cancel the charge buildup for even-order modes, so overtones are suppressed; in the P3F stack, the inverted piezoelectric coefficients flip the sign of e33 across the interface, making charge buildup constructive for A2 and destructive for S1. This lets the device operate at 19.23 MHz using a 0.34 mm-thick stack—thicker than a single-layer resonator at the same frequency—preserving acoust

Load-bearing premise

The record-breaking frequency-quality product depends on accepting the smoothed BodeQ of 3187 as the quality factor and the 29% coupling extracted from the series and parallel resonances; using the standard IEEE-176 effective coupling formula on the same resonances gives about 19%, and the 3-dB bandwidth Q is 1282.

Editorial extensions

If this is right

  • The P3F design breaks the usual trade-off between frequency scaling and coupling efficiency: higher-order thickness modes can be excited at higher fs without thinning the film or shrinking the active region.
  • The same polarity-alternation principle extends to multilayer stacks, offering additional frequency scaling and bandwidth control.
  • Because the resonator operates at 19.23 MHz with high k2 and Q, it is suited for piezoelectric DC-DC converters targeting high-frequency, high power-density operation.
  • The demonstrated A6 mode at 63.9 MHz shows that the P3F structure can excite still higher overtones, potentially pushing power conversion into the tens-of-megahertz range.
  • Wafer bonding and electroplating processes yield >97% bonded area and about 1 J/m2 bond strength, providing a manufacturable integration route for P3F devices.

Reading between the lines

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

  • Applying the standard IEEE-176 effective coupling formula to the measured series and parallel resonances (19.23 MHz and 21.38 MHz) gives roughly 19% rather than 29%; if that value is used, the claimed state-of-the-art fs·Q product drops below the cited single-layer LN-TE figure. This is an extraction choice the paper makes, not a paper claim.
  • The same polarity-alternation mechanism could be tested in other piezoelectric materials such as lithium tantalate or aluminum nitride; if it generalizes, the frequency-scaling benefit would extend beyond lithium niobate.
  • The grounded-ring layout suppresses spurious modes less effectively in the P3F configuration than in single-layer resonators; optimizing the ring geometry or adopting a different lateral-mode trap is a testable path to cleaner spectra.
  • Power handling was measured at a single frequency; mapping the failure threshold across the full resonance band would show whether the 58 dBm limit reflects a material limit or a particular operating point.
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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

3 major / 3 minor

Summary. The paper reports a bi-layer 36°Y-cut lithium niobate resonator using the periodically poled piezoelectric film (P3F) concept, in which two oppositely oriented LN layers are bonded to excite the second-order antisymmetric thickness-extensional (A2) mode. The authors present FEA mode-shape evidence, a wafer-bonding and fabrication process, electrical characterization (fs = 19.23 MHz, fp = 21.38 MHz), a claimed k2 of 29% and Q of 3187, temperature-dependent measurements, and destructive high-power testing up to 58 dBm. The central claims are that this is the first P3F TE LN resonator for power conversion and that it achieves a record fs·Q product among piezoelectric power resonators.

Significance. If the headline numbers are correct, the work is significant for power electronics: it demonstrates a structural route to higher operating frequency without thinning the piezoelectric layer, and it provides the first systematic high-power and temperature data on P3F LN. The measured absence of the S1 mode and the FEA mode-shape comparison give credible support to the proposed A2 excitation mechanism, and the wafer-bonding and power-handling results are useful to the community. However, the quantitative performance claims rest on nonstandard or unspecified Q and k2 extraction procedures, so the paper's main quantitative contribution is not yet established as stated.

major comments (3)
  1. [Section V, Figs. 8–9, and Table I] The headline Q = 3187 is the peak of a Gaussian-smoothed BodeQ trace, while the paper itself reports a 3-dB Q of 1282 for the same device, attributed to electrode loading. The state-of-the-art fs·Q value in Table I uses 3187. For a power-conversion resonator, the loaded 3-dB Q is the relevant figure. With 1282, fs·Q = 19.23 MHz × 1282 = 2.46×10^10, which is below the single-layer LN-TE value already tabulated (10.14 MHz × 4000 = 4.06×10^10). The smoothed BodeQ also has an unspecified Gaussian filter width and is not a conservative estimate. The conclusion even states Q = 3148, inconsistent with 3187. Please report both Q values, specify the extraction procedure, and recompute all SOTA comparisons using the loaded Q.
  2. [Section V, Fig. 8, and Section II.B] The coupling coefficient k2 = 29% is stated to be 'extracted' from fs = 19.23 MHz and fp = 21.38 MHz, but no formula is given. Standard effective-coupling formulas from these two frequencies give lower values: (fp^2 − fs^2)/fp^2 ≈ 19%, and the IEEE-176 thickness-mode relation gives about 23%. The 29% value therefore appears to require a different or fitted definition. Since k2 enters the FoM and Table I, and since the FEA section also reports k2 = 24% without giving its formula, the experimental/simulation comparison is not verifiable. Specify the extraction formula and use one consistent definition for all k2 numbers.
  3. [Section VI, Figs. 14–15, and Conclusion] The device shows a permanent change in the frequency response at 42 dBm, attributed by the authors to bonding damage, and the 58 dBm value is complete physical failure with visible cracks and burned electrodes. The conclusion states 'power handling up to a failure threshold of 58 dBm,' but the useful operating range is limited by the irreversible degradation at 42 dBm. Please report both thresholds explicitly and clarify that 58 dBm is catastrophic failure, not the maximum power level at which the resonator remains functional.
minor comments (3)
  1. [Section V, temperature measurements] The text refers to 'Fig. 9(a)' and 'Fig. 9(b)' when discussing the temperature-dependent impedance and extracted fs; these should be Fig. 11(a) and Fig. 11(b).
  2. [References] Several references contain encoding artifacts, e.g., 'Jkslashorgensen', 'Bę', and '5.1kslash%' and '19.4kslash%'. These should be cleaned before submission.
  3. [Section V, Fig. 8] The measured impedance trace shows multiple in-band spurious peaks, yet the abstract and introduction list 'spurious-free response' as a target. The paper is honest about the residual spurious modes in the text, but the framing could be adjusted to avoid implying that the demonstrated device is spurious-free.

Circularity Check

0 steps flagged · score 1.0 of 10

No significant circularity; the paper is an experimental demonstration with independent FEA and measurements.

full rationale

The manuscript contains no formal derivation chain that reduces to its own inputs. The central claims are experimental: a fabricated P3F TE-mode LN resonator is measured, and its fs, k2, and Q are extracted from the measured impedance/admittance. The FEA simulations (Section II) use literature material constants and are not fitted to the measured results; the simulated fs (19.39 MHz) and k2 (24%) are close to but not identical to the measured values, indicating an independent prediction. The P3F concept is cited from prior work by the same authors, but the present contribution is the device demonstration and power-handling study, so the citations provide context rather than bearing the weight of the claim. The only near-concern is the metric choice for Q: the abstract and Table I use the smoothed peak BodeQ (3187) while the paper itself reports a 3dB Q of 1282, and the k2 extraction from fs/fp is not specified with a formula. These are measurement-interpretation or reporting choices that affect the strength of the state-of-the-art comparison, but they are not circular: the Q and k2 values are not fitted to make the fs·Q claim true, and the paper explicitly discloses the alternative 3dB Q. No fitted parameter is renamed as a prediction, no uniqueness theorem is imported from the authors, and no known result is merely relabeled. Under the rules, disagreement with the chosen metric or inconsistency between abstract and conclusion is a correctness/consistency issue, not circularity. Therefore the circularity score is low (1), reflecting only a minor self-citation presence that is not load-bearing.

Assumptions & free parameters 1 free parameters · 4 assumptions · 0 invented entities

The central claims rest on literature material constants, an ideal-bond assumption in FEA, and two measurement definitions (smoothed BodeQ and an unspecified k2 extraction). No new physical entities are introduced.

free parameters (1)
  • Gaussian moving average filter width for BodeQ = not stated
    The reported peak Q of 3187 comes from a smoothed BodeQ curve; the filter width is chosen by the authors and not quantified, and it directly sets the headline performance metric.
assumptions (4)
  • domain assumption 36 degree Y-cut LN piezoelectric constants in Eq. (1) are valid for both bonded layers
    FEA and mode analysis rely on these literature constants; the bonded stack is assumed to behave as two ideal oppositely poled crystals.
  • domain assumption The bonded interface is acoustically transparent in the FEA and does not add loss
    Simulation treats the P3F stack as continuous; interface roughness, voids, and bond compliance are not modeled, yet Q=3187 depends on low loss.
  • ad hoc to paper The coupling coefficient is extracted by an unstated formula that yields 29% from the stated resonances
    The standard effective coupling formula gives about 19% for fs=19.23 MHz and fp=21.38 MHz; the paper's 29% requires a different, unspecified definition.
  • ad hoc to paper Smoothed peak BodeQ represents the resonator quality factor for SOTA comparison
    The 3dB Q of the same device is 1282; using 3187 instead is a measurement-interpretation choice that sustains the fs*Q record claim.

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Cite this review

Pith. "Pith review of Periodically Poled Piezoelectric Lithium Niobate Resonator for Piezoelectric Power Conversion." pith.science (2026). https://pith.science/paper/URUP6YRX

@misc{pith2026250809407,
  author       = {Pith},
  title        = {Pith review of: Periodically Poled Piezoelectric Lithium Niobate Resonator for Piezoelectric Power Conversion},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/URUP6YRX}},
  note         = {Machine review of arXiv:2508.09407}
}
abstract

As the demand for compact and efficient power conversion systems increases, piezoelectric power converters have gained attention for their ability to replace bulky magnetic inductors with acoustic resonators, enabling higher power density and improved efficiency. Achieving optimal converter performance requires resonators with high quality factor ($Q$), strong electromechanical coupling ($k^2$), high power handling capability, and a spurious-free response. Lithium niobate (LN) has emerged as a promising material in this context due to its high figure of merit (FoM = $Q \cdot k^2$). While previous studies on single-layer LN resonators have demonstrated high FoM values, they typically operate at relatively low resonance frequencies ($f_s$). Recently, periodically poled piezoelectric film (P3F) structures, formed by stacking piezoelectric layers with alternating crystal orientations, have shown the potential to both scale up the operating frequency and enhance the FoM compared to single-layer counterparts in piezoelectric power conversion. This work presents the first P3F thickness-extensional (TE) LN resonator for power conversion, operating at 19.23 MHz, with a large \textit{$k^2$} of 29\% and a high \textit{Q} of 3187, achieving a state-of-the-art (\textit{ $f_s \cdot Q$}) product among piezoelectric power resonators. A high-power testing procedure is performed to systematically study the nonlinear behavior and power handling of P3F LN for power applications. With further optimization, P3F TE resonators have the potential to open up a new design space for high-power and high-frequency power conversion.

Figures

Figures reproduced from arXiv: 2508.09407 by the authors.

Figure 1
Figure 1. Schematics of (a) side-view with material axes of P3F [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 3
Figure 3. FEA simulated results of the proposed P3F resonator: (a) [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figure 4
Figure 4. Simulated wideband impedance response from 1–100 MHz [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗
Figures from the paper (9 more)
Figure 5
Figure 5. Figure 5: (a) Optical image of the bonded 36°Y-cut|36°Y-cut LiNbO3 pair with 97% effective bonded area. Inset: bonding design schematic. Schematics of wafer orientation for the (b) top and the (c) bottom wafer [PITH_FULL_IMAGE:figures/full_fig_p004_5.png]
Figure 6
Figure 6. Figure 6: Bond strength measurement showing a crack length of 4.7 [PITH_FULL_IMAGE:figures/full_fig_p004_6.png]
Figure 8
Figure 8. Figure 8: Measured frequency domain impedance and resistance of [PITH_FULL_IMAGE:figures/full_fig_p005_8.png]
Figure 7
Figure 7. Figure 7: Fabrication and integration process for P3F TE LN resonator. [PITH_FULL_IMAGE:figures/full_fig_p005_7.png]
Figure 10
Figure 10. Figure 10: Measured wideband impedance response from 1–100 MHz [PITH_FULL_IMAGE:figures/full_fig_p005_10.png]
Figure 11
Figure 11. Figure 11: (a) Measured frequency domain impedance and resistance at [PITH_FULL_IMAGE:figures/full_fig_p006_11.png]
Figure 13
Figure 13. Figure 13: High power resonator impedance testing setup. [PITH_FULL_IMAGE:figures/full_fig_p007_13.png]
Figure 14
Figure 14. Figure 14: (a) New resonator and matching network frequency response [PITH_FULL_IMAGE:figures/full_fig_p007_14.png]
Figure 15
Figure 15. Figure 15: (a) Normalized |Z| vs power of new resonator from 10dBm to [PITH_FULL_IMAGE:figures/full_fig_p007_15.png]

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Forward citations

Cited by 2 Pith papers

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  1. Spurious-Free Lithium Niobate Bulk Acoustic Wave Resonator with Grounded-Ring Electrode

    eess.SY 2026-04 conditional novelty 7.0 of 10

    A grounded-ring electrode in lithium niobate creates a spurious-free thickness-extensional BAW resonator operating at 10.14 MHz with 29.6% electromechanical coupling and maximum Q of 5230.

  2. Bimorph Lithium Niobate Piezoelectric Micromachined Ultrasonic Transducer

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Pith tools

Reviewed August 5, 2026 · model on record in the stance chip above.