Details

Autor(en) / Beteiligte

• Dinh, Thi Thuy Duong
• González-Andrade, David
• Montesinos-Ballester, Miguel
• Deniel, Lucas
• Szelag, Bertrand
• Le Roux, Xavier
• Cassan, Eric
• Marris-Morini, Delphine
• Vivien, Laurent
• Cheben, Pavel
• Velasco, Aitor V
• Alonso-Ramos, Carlos

Titel

Silicon photonic on-chip spatial heterodyne Fourier transform spectrometer exploiting the Jacquinot's advantage

Ist Teil von

• Optics letters, 2021-03, Vol.46 (6), p.1341-1344

Ort / Verlag

United States: Optical Society of America

Erscheinungsjahr

2021

Link zum Volltext

Quelle

OSA Publishing

Beschreibungen/Notizen

• 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 90µ ×60µ 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 4.5 footprint.