A compact Michelson interferometer based on-chip Fourier transform spectrometer

Daniel Donnelly; Jianhao Shen; Swapnajit Chakravarty

doi:10.1117/12.2663712

15 June 2023 A compact Michelson interferometer based on-chip Fourier transform spectrometer

Daniel Donnelly, Jianhao Shen, Swapnajit Chakravarty

Proceedings Volume 12516, Next-Generation Spectroscopic Technologies XV; 125160F (2023) https://doi.org/10.1117/12.2663712
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

We experimentally demonstrate a compact Fourier Transform on-chip spectrometer based on spatially heterodyned array of Michelson interferometers (MIs) in a silicon-on-insulator (SOI) platform. We demonstrate that with the same progressive geometric path length difference between the spatially heterodyned arrayed interferometer arms, MIs double the optical phase delays and thus double the wavelength resolution (δλ=0.8nm) compared to Mach-Zehnder interferometers (MZIs) (δλ=1.6nm). Our proof-of-concept device demonstrates one method to address the bandwidth-resolution tradeoff inherent in on-chip FTIRs, which gains in significance for optical sensing applications requiring single digit picometers resolution in compact on-chip form factors.

Conference Presentation

Citation Download Citation

Daniel Donnelly, Jianhao Shen, and Swapnajit Chakravarty "A compact Michelson interferometer based on-chip Fourier transform spectrometer", Proc. SPIE 12516, Next-Generation Spectroscopic Technologies XV, 125160F (15 June 2023); https://doi.org/10.1117/12.2663712

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