Jason Herrmann

All Publications

• Integrated millimeter-wave cavity electro-optic transduction. Nature communications Multani, K. K., Herrmann, J. F., Nanni, E. A., Safavi-Naeini, A. H. 2026

  Abstract

  Emerging communications and computing technologies will rely ever-more on expanding the useful radio frequency spectrum into the millimeter-wave and terahertz frequency range. Both classical and quantum applications would benefit from advancing integration and incorporation of millimeter-wave and electro-optic technologies into common devices, such as modulators. Here we demonstrate an integrated triply-resonant, superconducting electro-optic transducer. Our design incorporates an on-chip 107 GHz niobium titanium nitride superconducting resonator, modulating a thin-film lithium niobate optical racetrack resonator operating at telecom wavelengths. We observe a maximum photon transduction efficiency of etaOE0.82*10-6 and an average single-photon electro-optic interaction rate of g0/2pi0.7kHz. We also present a study and analysis of the challenges associated with the design of integrated millimeter-wave resonators and propose possible solutions to these challenges. Our work paves the way for further advancements in resonant electro-optic technologies operating at millimeter-wave frequencies.

  View details for DOI 10.1038/s41467-025-67932-w

  View details for PubMedID 41495046

• Low-loss, highly tunable Sagnac loop reflectors and Fabry-Perot cavities on thin-film lithium niobate OPTICS LETTERS Qi, L., Khalatpour, A., Herrmann, J. F., Park, T., Dean, D., Robison, S., Hwang, A., Stokowski, H., Serkland, D., Fejer, M. M., Safavi-Naeini, A. H. 2025; 50 (16): 5173-5176

  Abstract

  We present low-loss (<1.5%) and power-efficient Mach-Zehnder interferometers (MZIs) on thin-film lithium niobate. To accurately measure small MZI losses, we develop a self-calibrated method using tunable Sagnac loop reflectors (SLRs) to build cavities. Fabry-Pérot cavities constructed from these SLRs achieve an intrinsic quality factor of 2×106. By implementing thermal isolation trenches, we also demonstrate a >10× reduction in power consumption for thermo-optic phase shifters, achieving a Pπ of 2.5 mW. These components are crucial for scaling up complex photonic integrated circuits.

  View details for DOI 10.1364/OL.568165

  View details for Web of Science ID 001564056000003

  View details for PubMedID 40815768

• Arbitrary electro-optic bandwidth and frequency control in lithium niobate optical resonators. Optics express Herrmann, J. F., Dean, D. J., Sarabalis, C. J., Ansari, V., Multani, K., Wollack, E. A., McKenna, T. P., Witmer, J. D., Safavi-Naeini, A. H. 2024; 32 (4): 6168-6177

  Abstract

  In situ tunable photonic filters and memories are important for emerging quantum and classical optics technologies. However, most photonic devices have fixed resonances and bandwidths determined at the time of fabrication. Here we present an in situ tunable optical resonator on thin-film lithium niobate. By leveraging the linear electro-optic effect, we demonstrate widely tunable control over resonator frequency and bandwidth on two different devices. We observe up to 50* tuning in the bandwidth over 50 V with linear frequency control of 230 MHz/V. We also develop a closed-form model predicting the tuning behavior of the device. This paves the way for rapid phase and amplitude control over light transmitted through our device.

  View details for DOI 10.1364/OE.502142

  View details for PubMedID 38439326

• Efficient Photonic Integration of Diamond Color Centers and Thin-Film Lithium Niobate ACS PHOTONICS Riedel, D., Lee, H., Herrmann, J. F., Grzesik, J., Ansari, V., Borit, J., Stokowski, H. S., Aghaeimeibodi, S., Lu, H., McQuade, P. J., Melosh, N. A., Shen, Z., Safavi-Naeini, A. H., Vuckovic, J. 2023; 10 (12): 4236-4243

  View details for DOI 10.1021/acsphotonics.3c00992

  View details for Web of Science ID 001128748300001

• Platform-agnostic waveguide integration of high-speed photodetectors with evaporated tellurium thin films OPTICA Ahn, G., White, A. D., Kim, H., Higashitarumizu, N., Mayor, F. M., Herrmann, J. F., Jiang, W., Multani, K. K. S., Safavi-Naeini, A. H., Javey, A., Vuckovic, J. 2023; 10 (3): 349-355

  View details for DOI 10.1364/OPTICA.475387

  View details for Web of Science ID 000983216600001

• Tunable dual wavelength laser on thin film lithium niobate Lufungula, I., Mayor, F. M., Herrmann, J. F., Park, T., Stokowski, H. S., Hwang, A. Y., De Beeck, C., Atalar, O., Jiang, W., Kuyken, B., Safavi-Naeini, A. H., IEEE IEEE. 2023

  View details for DOI 10.1109/IPC57732.2023.10360651

  View details for Web of Science ID 001156890300147

• Ultra-low-power second-order nonlinear optics on a chip. Nature communications McKenna, T. P., Stokowski, H. S., Ansari, V., Mishra, J., Jankowski, M., Sarabalis, C. J., Herrmann, J. F., Langrock, C., Fejer, M. M., Safavi-Naeini, A. H. 2022; 13 (1): 4532

  Abstract

  Second-order nonlinear optical processes convert light from one wavelength to another and generate quantum entanglement. Creating chip-scale devices to efficiently control these interactions greatly increases the reach of photonics. Existing silicon-based photonic circuits utilize the third-order optical nonlinearity, but an analogous integrated platform for second-order nonlinear optics remains an outstanding challenge. Here we demonstrate efficient frequency doubling and parametric oscillation with a threshold of tens of micro-watts in an integrated thin-film lithium niobate photonic circuit. We achieve degenerate and non-degenerate operation of the parametric oscillator at room temperature and tune its emission over one terahertz by varying the pump frequency by hundreds of megahertz. Finally, we observe cascaded second-order processes that result in parametric oscillation. These resonant second-order nonlinear circuits will form a crucial part of the emerging nonlinear and quantum photonics platforms.

  View details for DOI 10.1038/s41467-022-31134-5

  View details for PubMedID 35927246

• Mirror symmetric on-chip frequency circulation of light NATURE PHOTONICS Herrmann, J. F., Ansari, V., Wang, J., Witmer, J. D., Fan, S., Safavi-Naeini, A. H. 2022

  View details for DOI 10.1038/s41566-022-01026-7

  View details for Web of Science ID 000824862900001

• High-bandwidth CMOS-voltage-level electro-optic modulation of 780 nm light in thin-film lithium niobate OPTICS EXPRESS Celik, O., Sarabalis, C. J., Mayor, F. M., Stokowski, H. S., Herrmann, J. F., McKenna, T. P., Lee, N. R. A., Jiang, W., Multani, K. K. S., Safavi-Naeini, A. H. 2022; 30 (13): 23177-23186

  View details for DOI 10.1364/OE.460119

  View details for Web of Science ID 000813479600073

• III/V-on-lithium niobate amplifiers and lasers OPTICA de Beeck, C., Mayor, F. M., Cuyvers, S., Poelman, S., Herrmann, J. F., Atalar, O., McKenna, T. P., Haq, B., Jiang, W., Witmer, J. D., Roelkens, G., Safavi-Naeini, A. H., Van Laer, R., Kuyken, B. 2021; 8 (10): 1288-1289

  View details for DOI 10.1364/OPTICA.438620

  View details for Web of Science ID 000709553000008

• Photonic Modal Circulator Using Temporal Refractive-Index Modulation with Spatial Inversion Symmetry. Physical review letters Wang, J., Herrmann, J. F., Witmer, J. D., Safavi-Naeini, A. H., Fan, S. 2021; 126 (19): 193901

  Abstract

  It has been demonstrated that dynamic refractive-index modulation, which breaks time-reversal symmetry, can be used to create on-chip nonreciprocal photonic devices. In order to achieve amplitude nonreciprocity, all such devices moreover require modulations that break spatial symmetries, which adds complexity in implementations. Here we introduce a modal circulator, which achieves amplitude nonreciprocity through a circulation motion among three modes. We show that such a circulator can be achieved in a dynamically modulated structure that preserves mirror symmetry, and as a result can be implemented using only a single standing-wave modulator, which significantly simplifies the implementation of dynamically modulated nonreciprocal devices. We also prove that in terms of the number of modes involved in the transport process, the modal circulator represents the minimum configuration in which complete amplitude nonreciprocity can be achieved while preserving spatial symmetry.

  View details for DOI 10.1103/PhysRevLett.126.193901

  View details for PubMedID 34047603

• Cryogenic microwave-to-optical conversion using a triply resonant lithium-niobate-on-sapphire transducer OPTICA McKenna, T. P., Witmer, J. D., Patel, R. N., Jiang, W., Van Laer, R., Arrangoiz-Arriola, P., Wollack, E., Herrmann, J. F., Safavi-Naeini, A. H. 2020; 7 (12): 1737–45

  View details for DOI 10.1364/OPTICA.397235

  View details for Web of Science ID 000600773800014