Integrated photonic slow light Michelson interferometer bio sensor

Jianhao Shen; Daniel Donnelly; Swapnajit Chakravarty

doi:10.1117/12.2650514

17 March 2023 Integrated photonic slow light Michelson interferometer bio sensor

Jianhao Shen, Daniel Donnelly, Swapnajit Chakravarty

Proceedings Volume 12424, Integrated Optics: Devices, Materials, and Technologies XXVII; 124241B (2023) https://doi.org/10.1117/12.2650514
Event: SPIE OPTO, 2023, San Francisco, California, United States

Conference Poster

Abstract

Diverse chip-based sensors utilizing integrated silicon photonics have been demonstrated in resonator and phase shifter/interferometer configurations. Till date, interferometric techniques with the Mach-Zehnder Interferometer (MZI) and Young’s interferometer have shown the lowest mass detection limits (in pg/mm²). Slow light in photonic crystal waveguides integrated with MZIs enables compact geometries due to enhanced optical path lengths as light propagates with high group index. In a typical MZI, light propagating in the signal arm overlaps with analytes and undergo a relative phase change with respect to the light in the reference arm which leads to measured output intensity changes. In this paper, using integrated photonic methods, we demonstrate a slow light enhanced Michelson interferometer (MI) biosensor, wherein the reference and signal arms are traversed twice by the propagating optical mode. As a result, the analyte interaction length is effectively doubled since the propagating optical mode undergoes twice the phase shift as would be observed in a MZI. In an asymmetric MI configuration, the resultant doubling of the phase shift is observed as a doubling of the resonance wavelength shift for a fixed change in the analyte concentration. The device sensitivity is thus doubled with respect to a conventional MZI while also effectively halving the geometric length compared to the MZI sensor.

Citation Download Citation

Jianhao Shen, Daniel Donnelly, and Swapnajit Chakravarty "Integrated photonic slow light Michelson interferometer bio sensor", Proc. SPIE 12424, Integrated Optics: Devices, Materials, and Technologies XXVII, 124241B (17 March 2023); https://doi.org/10.1117/12.2650514

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