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Proceedings Paper

Time-resolved optical spectrometer based on a monolithic array of high-precision TDCs and SPADs
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Paper Abstract

We present a compact time-resolved spectrometer suitable for optical spectroscopy from 400 nm to 1 μm wavelengths. The detector consists of a monolithic array of 16 high-precision Time-to-Digital Converters (TDC) and Single-Photon Avalanche Diodes (SPAD). The instrument has 10 ps resolution and reaches 70 ps (FWHM) timing precision over a 160 ns full-scale range with a Differential Non-Linearity (DNL) better than 1.5 % LSB. The core of the spectrometer is the application-specific integrated chip composed of 16 pixels with 250 μm pitch, containing a 20 μm diameter SPAD and an independent TDC each, fabricated in a 0.35 μm CMOS technology. In front of this array a monochromator is used to focus different wavelengths into different pixels. The spectrometer has been used for fluorescence lifetime spectroscopy: 5 nm spectral resolution over an 80 nm bandwidth is achieved. Lifetime spectroscopy of Nile blue is demonstrated.

Paper Details

Date Published: 31 January 2014
PDF: 6 pages
Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 89932I (31 January 2014); doi: 10.1117/12.2040519
Show Author Affiliations
Davide Tamborini, Politecnico di Milano (Italy)
Bojan Markovic, Politecnico di Milano (Italy)
Laura Di Sieno, Politecnico di Milano (Italy)
Davide Contini, Politecnico di Milano (Italy)
Andrea Bassi, Politecnico di Milano (Italy)
Simone Tisa, Politecnico di Milano (Italy)
Alberto Tosi, Politecnico di Milano (Italy)
Franco Zappa, Politecnico di Milano (Italy)

Published in SPIE Proceedings Vol. 8993:
Quantum Sensing and Nanophotonic Devices XI
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)

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