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Independently Reconfigurable Internal Loss and Resonance Shift in an Interferometer-Embedded Optical Cavity

Dash, A and Mere, V and Selvaraja, SK and Naik, AK (2022) Independently Reconfigurable Internal Loss and Resonance Shift in an Interferometer-Embedded Optical Cavity. In: Physical Review Applied, 18 (5).

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Official URL: https://doi.org/10.1103/PhysRevApplied.18.054032


Optical cavities find diverse uses in lasers, frequency combs, optomechanics, and optical signal processors. Complete reconfigurability of the resonant frequency as well as the loss enables development of generic field programmable cavities for achieving the desired performance in these applications. Conventional reconfigurable cavities are generally limited to specific material platforms or specific optical tuning methods and require sophisticated fabrication. Furthermore, the tuning of the loss is coupled to the resonance shift in the cavity. We propose and demonstrate a simple and generic interferometer in a cavity structure that enables quasiperiodic modification of the internal cavity loss and the cavity resonance to reconfigure the Q factor, transmission characteristics, and group delay of the hybrid cavity, with simple tuning of the optical phase in the interferometer. We also demonstrate methods to decouple the tuning of the loss from the resonance shift, that enables resonance-locked reconfigurability. This structure also enables resonance shift to both shorter and longer wavelengths using the same phase-tuning technique, which is challenging to achieve in conventional reconfigurable cavities. These devices can be implemented in any guided-wave platform (on-chip or fiber-optic) with potential applications in programmable photonics and reconfigurable optomechanics. © 2022 American Physical Society.

Item Type: Journal Article
Publication: Physical Review Applied
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to the author(s).
Keywords: Group delay; Guided electromagnetic wave propagation; Natural frequencies; Optomechanics; Q factor measurement; Signal processing; Tuning, Frequency combs; Internal loss; Internal resonance; Laser frequency; Optical cavities; Opto-mechanics; Reconfigurability; Reconfigurable; Resonance shift; Simple++, Interferometers
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 13 Jan 2023 11:39
Last Modified: 13 Jan 2023 11:39
URI: https://eprints.iisc.ac.in/id/eprint/79142

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