Single-Pixel Fluorescence Spectroscopy Using Near-Field Dispersion for Single-Photon Counting and Single-Shot Acquisition

• DOI: 10.1021/acsphotonics.2c00710
• Publication Date: 2022-08-24T19:30:41Z
• Authors: Sofie Tiedeck; Moritz B. Heindl; Peter Kramlinger; Julia Naas; Fabian Brütting; Nicholas Kirkwood; Paul Mulvaney; Georg Herink
• Keywords: Photon Counting

Time-resolved sensing of fluorescence quanta provides exceptionally versatile information–including access to nanoscopic structure, chemical environment and nonclassical behavior quantum emitters. Combined spectro-temporal information is typically obtained using spatial dispersion with photoelectron imaging such as streak-cameras or position-sensitive counting and, alternatively, sequential filtering single-pixel detectors. However, schemes require complex, expensive low-sensitivity detectors rely on scanning acquisition. Here, we demonstrate a implementation emission spectroscopy entirely in the temporal domain compatible (a) time-correlated single-photon (TCSPC) (b) high-speed single-shot detection. Harnessing near-field regime Time-Stretch Dispersive Fourier Transformation (TS-DFT), encode spectral via chromatic into signals, retrieval entwined direct deconvolution prior knowledge. Addressing high optical throughput for extended emitters, introduce high-bandwidth graded-index multimode fiber TS-DFT. As proof-of-concept, present rapid thermometry based quantum-dot luminescence. Given its speed, efficiency, simplicity, foresee broad applications fast hyperspectral confocal microscopy, low-light sensing, high-throughput screening.