Patents
Apparatus and Methods for Enhanced Simulation of Light Propagation in a Scattering Medium
U.S. Patent Application No. 19/210,929, filed May 2025.
A finite difference solver for Maxwell's equations in highly scattering media, with reduced computational complexity compared to existing techniques. This solver has been used by my PhD research group to solve some previously intractable computational problems in deep-tissue microscopy.
Nonlinear scanning optical microphotonic gyroscope
U.S. Patent Application No. 63/784,713, filed Apr 2025.
A chip-scale optical gyroscope that outperforms earlier miniature devices by several orders of magnitude. The optical circuit is compatible with standard lithographic fabrication, enabling low-cost, mass-produced navigation-grade gyroscopes.
Publications
T. Shanavas, G. Krueper, J. Zhu, W. Park, and J. T. Gopinath, "Nonlinear symmetry breaking to enhance the Sagnac effect in a microresonator gyroscope", Appl. Phys. Lett. 128 (2025)This chip-scale optical gyroscope achieves performance improvements of several orders of magnitude over earlier miniature devices. The optical circuit is compatible with standard lithographic fabrication, enabling low-cost, mass-produced navigation-grade gyroscopes. Gregory Krueper and I contributed equally to this work.
T. Shanavas, R. R. McLeod, M. E. Siemens, and J. T. Gopinath, "Fast finite difference solver for optical microscopy in deep biological tissue", Optics Letters 49(15), 4417 (2024)A finite difference solver for Maxwell's equations in highly scattering media, that scales as O(n2.37) compared to O(n3) for existing techniques. This solver is used in our group to design optical microscopes to image deep biological tissue.
T. Shanavas, M. B. Grayson, B. Xu, M. Zohrabi, W. Park, and J. T. Gopinath, "Cascaded forward Brillouin lasing in a chalcogenide whispering gallery mode microresonator", APL Photonics 7, no. 11: 116108 (2022)This is the first report of cascaded forward stimulated Brillouin scattering in a microresonator platform. We observed lasing at a sub-mW power. We demonstrated a new scheme for Brillouin lasing in low-quality (Q~105) optical cavities.
Conference Talks
T. Shanavas, G. Krueper, J. Zhu, W. Park, and J. T. Gopinath, "Nonlinear symmetry breaking to enhance the sagnac effect in a microresonator gyroscope,” in Frontiers in Optics (2025)T. Shanavas, M. B. Grayson, M. Zohrabi, W. Park, and J. T. Gopinath, "Cascaded Forward Brillouin Scattering in a Chalcogenide Microsphere," in Conference on Lasers and Electro-Optics, paper STh5F.7 (2022)
T. Shanavas, R. R. McLeod, M. E. Siemens, and J.T. Gopinath, "Comparison of Coherent and Incoherent Donut Beams for Deep Tissue STED Microscopy," in Conference on Lasers and Electro-Optics, paper SM1I.2 (2023)