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• W3129904741 abstract "Silicon photonics on-chip spectrometers are finding important applications in medical diagnostics, pollution monitoring, and astrophysics. Spatial heterodyne Fourier transform spectrometers (SHFTSs) provide a particularly interesting architecture with a powerful passive error correction capability and high spectral resolution. Despite having an intrinsically large optical throughput (étendue, also referred to as Jacquinot’s advantage), state-of-the-art silicon SHFTSs have not exploited this advantage yet. Here, we propose and experimentally demonstrate for the first time, to the best of our knowledge, an SHFTS implementing a wide-area light collection system simultaneously feeding an array of 16 interferometers, with an input aperture as large as <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>90</mml:mn> </mml:mrow> </mml:mrow> <mml:mspace width=thickmathspace /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mtext>µ<!-- µ --></mml:mtext> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>m</mml:mi> </mml:mrow> </mml:mrow> </mml:mrow> <mml:mo>×<!-- × --></mml:mo> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>60</mml:mn> </mml:mrow> </mml:mrow> <mml:mspace width=thickmathspace /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mtext>µ<!-- µ --></mml:mtext> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>m</mml:mi> </mml:mrow> </mml:mrow> </mml:mrow> </mml:math> formed by a two-way-fed grating coupler. We experimentally demonstrate 85 pm spectral resolution, 600 pm bandwidth, and 13 dB étendue increase, compared with a device with a conventional grating coupler input. The SHFTS was fabricated using 193 nm deep-UV optical lithography and integrates a large-size input aperture with an interferometer array and monolithic Ge photodetectors, in a <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>4.5</mml:mn> </mml:mrow> <mml:mspace width=thickmathspace /> <mml:msup> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>m</mml:mi> <mml:mi mathvariant=normal>m</mml:mi> </mml:mrow> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> </mml:math> footprint." @default.
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• W3129904741 date "2021-03-10" @default.
• W3129904741 modified "2023-09-25" @default.
• W3129904741 title "Silicon photonic on-chip spatial heterodyne Fourier transform spectrometer exploiting the Jacquinot’s advantage" @default.
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• W3129904741 doi "https://doi.org/10.1364/ol.418278" @default.
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