A nanophotonic interferometer for small particle detection

A. Ghaffari; K. Do; S. Kashani; K. Weninger; R. Riehn

doi:10.1117/12.2634318

3 October 2022 A nanophotonic interferometer for small particle detection

A. Ghaffari, K. Do, S. Kashani, K. Weninger, R. Riehn

Proceedings Volume 12223, Interferometry XXI; 122230L (2022) https://doi.org/10.1117/12.2634318
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

The transmission of light through sub-wavelength apertures (zero-mode waveguides, ZMW) in metal films is wellexplored. It introduces both an amplitude modulation as well as a phase shift to the transmitted oscillating electromagnetic field. We propose a nanophotonic interferometer by bringing two zero-mode waveguides in proximity and monitoring the distribution of light in the back-focal plane of the collecting microscope objective. We demonstrate that both an asymmetry induced by the binding of a quantum dot in one of the two ZMW, as well as a asymmetry in ZMW diameter yield qualitatively similar deflection patterns. Using ZMW pairs with diameter asymmetries, we find that the complex pattern of the transmitted light can be quantified through a scalar measure of asymmetry along the symmetry axis of the aperture pair. We find that this scalar asymmetry is a monotonous function of the diameter difference of the two apertures.

Conference Presentation

Citation Download Citation

A. Ghaffari, K. Do, S. Kashani, K. Weninger, and R. Riehn "A nanophotonic interferometer for small particle detection", Proc. SPIE 12223, Interferometry XXI, 122230L (3 October 2022); https://doi.org/10.1117/12.2634318

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