Multispectral compressive fluorescence lifetime imaging microscopy with a SPAD array detector

Ghezzi, Alberto; Farina, Andrea; Bassi, Andrea; Valentini, Gianluca; Labanca, Ivan; Acconcia, Giulia; Rech, Ivan; D’Andrea, Cosimo

doi:10.1364/ol.419381

Cited by 27 publications

(11 citation statements)

References 23 publications

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“…In recent years, considerable efforts were invested in the design of time-resolved light spectrometers with high sensitivity. − As a replacement for the standard CCD camera, different research groups adopted photomultiplier tube (PMT) arrays, superconducting nanowire single photon detectors (SNSPDs), − or SPAD arrays. ,,, While these implementations harbor great potential for applications such as Raman spectroscopy and on-chip quantum communications, none is able to provide the combination of high overall detection efficiency, low dark counts, and parallel time and spectrum detection at single-photon level. The spectroSPAD spectrometer (Figure ) achieves precisely that by employing a high-performance linear SPAD array as a detector in a Czerny–Turner spectrometer.…”

Section: Resultsmentioning

confidence: 99%

Heralded Spectroscopy Reveals Exciton–Exciton Correlations in Single Colloidal Quantum Dots

et al. 2021

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Multiply excited states in semiconductor quantum dots feature intriguing physics and play a crucial role in nanocrystal-based technologies. While photoluminescence provides a natural probe to investigate these states, room-temperature single-particle spectroscopy of their emission has proved elusive due to the temporal and spectral overlap with emission from the singly excited and charged states. Here, we introduce biexciton heralded spectroscopy enabled by a single-photon avalanche diode array based spectrometer. This allows us to directly observe biexciton–exciton emission cascades and measure the biexciton binding energy of single quantum dots at room temperature, even though it is well below the scale of thermal broadening and spectral diffusion. Furthermore, we uncover correlations hitherto masked in ensembles of the biexciton binding energy with both charge-carrier confinement and fluctuations of the local electrostatic potential. Heralded spectroscopy has the potential of greatly extending our understanding of charge-carrier dynamics in multielectron systems and of parallelization of quantum optics protocols.

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Section: Resultsmentioning

confidence: 99%

Heralded Spectroscopy Reveals Exciton–Exciton Correlations in Single Colloidal Quantum Dots

et al. 2021

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“…[32][33][34][35][36] As a replacement for the standard CCD camera, different research groups adopted photo-multiplier tube (PMT) arrays, 33 superconducting nanowire single photon detectors (SNSPDs) [35][36][37] or SPAD arrays. 32,34,38,39 While these implementations harbor great potential for applications such as Raman spectroscopy and on-chip quantum communications, none is able to provide the combination of high overall detection efficiency, low dark counts, and parallel time and spectrum detection at single-photon level. The spectroSPAD spectrometer (Figure 2) achieves precisely that by employing a high-performance linear SPAD array as a detector in a Czerny-Turner spectrometer.…”

Section: Resultsmentioning

confidence: 99%

Heralded spectroscopy reveals exciton-exciton correlations in single colloidal quantum dots

Lubin,

Tenne,

Ulku

et al. 2021

Preprint

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Multiply-excited states in semiconductor quantum dots feature intriguing physics and play a crucial role in nanocrystal-based technologies. While photoluminescence provides a natural probe to investigate these states, room temperature single-particle spectroscopy of their emission has so far proved elusive due to the temporal and spectral overlap with emission from the singly-excited and charged states. Here we introduce biexciton heralded spectroscopy, enabled by a single-photon avalanche diode array based spectrometer. This allows us to directly observe biexciton-exciton emission cascades and measure the biexciton binding energy of single quantum dots at room temperature, even though it is well below the scale of thermal broadening and spectral diffusion. Furthermore, we uncover correlations hitherto masked in ensembles, of the biexciton binding energy with both charge-carrier confinement and fluctuations of the local electrostatic potential. Heralded spectroscopy has the potential of greatly extending our understanding of charge-carrier dynamics in multielectron systems and of parallelization of quantum optics protocols.

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“…Moreover, the CS principle was realized in chip level to reduce the complexity of the read-out circuit and the overall data load, 50 was used to increase time resolution 14 (similar to imaging with coded range-gates 51 ) or applied to other optical sensing tasks such as spactral imaging. 52…”

Section: Compressive Sensing: Intensity Spectral and Range Imagingmentioning

confidence: 99%

Enhanced visual perception through photon counting and computational imaging: what the time and number of photon events can tell us about the world around us

Laurenzis

Christnacher

2022

Emerging Imaging and Sensing Technologies for Security and Defence VII

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Classical electro-optical (EO) sensing focuses on detecting light intensity and displaying it in grayscale images. Therefore, the development of EO systems was mainly concerned with the trade-off between resolution, signalto-noise ratio and image or data rate. In recent years, the development of silicon based single photon-counting avalanche diode (SPAD) detectors has initiated an almost unnoticed revolutionary development and paradigm shift in sensor technology. In contrast to intensity imaging, SPAD sensors are capable to sense a single photon event as a binary and noise free intensity. Furthermore, the occurrence of these photon events can be determined very precisely in time, allowing access to the sub-nanosecond or even picosecond time scale and application in precise distance measurement. Combined with computational imaging, i.e. linking the acquisition process to a strong mathematical model, it is possible to obtain information that was previously inaccessible and extend the perceptual range of EO sensors. In this paper, we provide an overview of various active and passive SPAD imaging techniques that are coupled with laser illumination or use ambient light. We focus on applications with relevance to military use. In detail, we summarize results in the areas of passive imaging, range finding and vision through scattering media, and advanced acquisition methods such as non-line-of-sight imaging.

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Multispectral compressive fluorescence lifetime imaging microscopy with a SPAD array detector

Cited by 27 publications

References 23 publications

Heralded Spectroscopy Reveals Exciton–Exciton Correlations in Single Colloidal Quantum Dots

Heralded Spectroscopy Reveals Exciton–Exciton Correlations in Single Colloidal Quantum Dots

Heralded spectroscopy reveals exciton-exciton correlations in single colloidal quantum dots

Enhanced visual perception through photon counting and computational imaging: what the time and number of photon events can tell us about the world around us

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