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5 March 2022 Quasi-bound states in resonant dielectric metastructures for integrated photonics
Sang-Yeon Cho, Andrea Alù, Weimin Zhou, Jason Sun
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Proceedings Volume 12011, High Contrast Metastructures XI; 1201103 (2022) https://doi.org/10.1117/12.2608316
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
We report light trapping and guiding properties in resonant dielectric metastructures for chip-scale photonic integrated circuit applications. Recently, several optical phenomena in all-dielectric structures have shown a new way to tightly confine light through the engineering of resonant scattering. The engineered resonant light scattering in dielectric artificial subwavelength structures can be utilized as an efficient light coupling platform between free space and integrated photonic devices, and strongly tailor light-matter interactions for a variety of metasurface applications. In this paper, we present the design and numerical modeling of high-index subwavelength asymmetric resonant structures that can guide light for integrated photonic circuits. The metastructures reported here consist of all-dielectric two-dimensional optical antenna arrays patterned on a slab waveguide. Light coupling can be achieved by synchronizing the phase of the resonantly scattered light by the subwavelength antennas to that of the guided modes in the waveguide. Resonant light scattering by high-index subwavelength resonators can lead to light trapping through the excitation of quasi photonic bound states in the continuum. This unique feature can be used to selectively launch a guided mode into a photonic waveguide at a predetermined spectral band.
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Sang-Yeon Cho, Andrea Alù, Weimin Zhou, and Jason Sun "Quasi-bound states in resonant dielectric metastructures for integrated photonics", Proc. SPIE 12011, High Contrast Metastructures XI, 1201103 (5 March 2022); https://doi.org/10.1117/12.2608316
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KEYWORDS
Resonators
Waveguides
Integrated photonics
Light scattering
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