Anti-Hermitian photodetector facilitating efficient subwavelength photon sorting

Soo Jin Kim (), Ju-Hyung Kang, Mehmet Mutlu, Joonsuk Park, Woosung Park, Kenneth E. Goodson, Robert Sinclair, Shanhui Fan, Pieter G. Kik and Mark L. Brongersma ()
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Soo Jin Kim: Stanford University
Ju-Hyung Kang: Stanford University
Mehmet Mutlu: Stanford University
Joonsuk Park: Stanford University
Woosung Park: Stanford University
Kenneth E. Goodson: Stanford University
Robert Sinclair: Stanford University
Shanhui Fan: Stanford University
Pieter G. Kik: University of Central Florida
Mark L. Brongersma: Stanford University

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract The ability to split an incident light beam into separate wavelength bands is central to a diverse set of optical applications, including imaging, biosensing, communication, photocatalysis, and photovoltaics. Entirely new opportunities are currently emerging with the recently demonstrated possibility to spectrally split light at a subwavelength scale with optical antennas. Unfortunately, such small structures offer limited spectral control and are hard to exploit in optoelectronic devices. Here, we overcome both challenges and demonstrate how within a single-layer metafilm one can laterally sort photons of different wavelengths below the free-space diffraction limit and extract a useful photocurrent. This chipscale demonstration of anti-Hermitian coupling between resonant photodetector elements also facilitates near-unity photon-sorting efficiencies, near-unity absorption, and a narrow spectral response (∼ 30 nm) for the different wavelength channels. This work opens up entirely new design paradigms for image sensors and energy harvesting systems in which the active elements both sort and detect photons.

Date: 2018
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DOI: 10.1038/s41467-017-02496-y

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