A method to improve the optical coupling into the bioinspired peptide micro-waveguides using aberrated objective

Roshan Tiwari; Sauvik Roy; Debasish Haldar; Ayan Banerjee

doi:10.1117/12.2593690

1 August 2021 A method to improve the optical coupling into the bioinspired peptide micro-waveguides using aberrated objective

Roshan Tiwari, Sauvik Roy, Debasish Haldar, Ayan Banerjee

Author Affiliations +

Proceedings Volume 11802, Nanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XVIII; 118020C (2021) https://doi.org/10.1117/12.2593690
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Abstract

Significant research has been done to develop functional bio-inspired nano-architectures for photonic, biomedical and energy storage applications. Among these, peptide nanostructures are the prime candidates with unique optical properties, like the wide optical transparency, high refractive index contrast, and optical nonlinearity. In this work, a linear aromatic diphenylalanine peptide, which is the core motif of Alzheimer-amyloid protein, is self-assembled into open-end hexagonal microtubes. The waveguiding aspects of the tubes are studied with high NA objectives acting as a major optical component to couple light into one of the ends of the tubes. Our study tells that the micro-waveguide’s performance with chromatically aberrated i.e uncorrected objective is far better than the corrected one giving a higher dynamical range, higher signal-to-noise ratio, and higher guided peak resolution, thus making it more suitable for fine measurements. The experimental results are verified using the finite difference time domain method. The higher resolution, higher scan depth, and color selectivity with the aberrated objectives indicate deploying these waveguides in biosensing and other applications.

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Citation Download Citation

Roshan Tiwari, Sauvik Roy, Debasish Haldar, and Ayan Banerjee "A method to improve the optical coupling into the bioinspired peptide micro-waveguides using aberrated objective", Proc. SPIE 11802, Nanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XVIII, 118020C (1 August 2021); https://doi.org/10.1117/12.2593690

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