Inverse design of photonic meta-structure for beam collimation in on-chip sensing

Abstract Designed or patterned structured surfaces, metasurfaces, enable the miniaturization of complex arrangements of optical elements on a plane. Most of the existing literature focuses on miniaturizing the optical detection; little attention is directed to on-chip optical excitation. In this wor...

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Autores principales:	Robin Singh, Yuqi Nie, Mingye Gao, Anuradha Murthy Agarwal, Brian W. Anthony
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a6f86c6fe59f49838280cb9f8e6190df
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spelling	oai:doaj.org-article:a6f86c6fe59f49838280cb9f8e6190df2021-12-02T11:37:22ZInverse design of photonic meta-structure for beam collimation in on-chip sensing10.1038/s41598-021-84841-22045-2322https://doaj.org/article/a6f86c6fe59f49838280cb9f8e6190df2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84841-2https://doaj.org/toc/2045-2322Abstract Designed or patterned structured surfaces, metasurfaces, enable the miniaturization of complex arrangements of optical elements on a plane. Most of the existing literature focuses on miniaturizing the optical detection; little attention is directed to on-chip optical excitation. In this work, we design a metasurface to create a planar integrated photonic source beam collimator for use in on-chip optofluidic sensing applications. We use an iterative inverse design approach in order to optimize the metasurface to achieve a target performance using gradient descent method. We then fabricate beam collimators and experimentally compare performance characteristics with conventional uniform binary grating-based photonic beam diffractors. The optimal design enhances the illumination power by a factor of 5. The reinforced beam is more uniform with 3 dB beam spot increased almost ~ 3 times for the same device footprint area. The design approach will be useful in on-chip applications of fluorescence imaging, Raman, and IR spectroscopy and will enable better multiplexing of light sources for high throughput biosensing.Robin SinghYuqi NieMingye GaoAnuradha Murthy AgarwalBrian W. AnthonyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Robin Singh Yuqi Nie Mingye Gao Anuradha Murthy Agarwal Brian W. Anthony Inverse design of photonic meta-structure for beam collimation in on-chip sensing
description	Abstract Designed or patterned structured surfaces, metasurfaces, enable the miniaturization of complex arrangements of optical elements on a plane. Most of the existing literature focuses on miniaturizing the optical detection; little attention is directed to on-chip optical excitation. In this work, we design a metasurface to create a planar integrated photonic source beam collimator for use in on-chip optofluidic sensing applications. We use an iterative inverse design approach in order to optimize the metasurface to achieve a target performance using gradient descent method. We then fabricate beam collimators and experimentally compare performance characteristics with conventional uniform binary grating-based photonic beam diffractors. The optimal design enhances the illumination power by a factor of 5. The reinforced beam is more uniform with 3 dB beam spot increased almost ~ 3 times for the same device footprint area. The design approach will be useful in on-chip applications of fluorescence imaging, Raman, and IR spectroscopy and will enable better multiplexing of light sources for high throughput biosensing.
format	article
author	Robin Singh Yuqi Nie Mingye Gao Anuradha Murthy Agarwal Brian W. Anthony
author_facet	Robin Singh Yuqi Nie Mingye Gao Anuradha Murthy Agarwal Brian W. Anthony
author_sort	Robin Singh
title	Inverse design of photonic meta-structure for beam collimation in on-chip sensing
title_short	Inverse design of photonic meta-structure for beam collimation in on-chip sensing
title_full	Inverse design of photonic meta-structure for beam collimation in on-chip sensing
title_fullStr	Inverse design of photonic meta-structure for beam collimation in on-chip sensing
title_full_unstemmed	Inverse design of photonic meta-structure for beam collimation in on-chip sensing
title_sort	inverse design of photonic meta-structure for beam collimation in on-chip sensing
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a6f86c6fe59f49838280cb9f8e6190df
work_keys_str_mv	AT robinsingh inversedesignofphotonicmetastructureforbeamcollimationinonchipsensing AT yuqinie inversedesignofphotonicmetastructureforbeamcollimationinonchipsensing AT mingyegao inversedesignofphotonicmetastructureforbeamcollimationinonchipsensing AT anuradhamurthyagarwal inversedesignofphotonicmetastructureforbeamcollimationinonchipsensing AT brianwanthony inversedesignofphotonicmetastructureforbeamcollimationinonchipsensing
_version_	1718395779817668608

Inverse design of photonic meta-structure for beam collimation in on-chip sensing

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