Tantalum STJ for Photon Counting Detectors

Single Photon Counting Detectors for TCSPC

Photon-Counting Superconducting Detectors for Submillimeter Astronomy

We are developing superconducting direct detectors (Single Quasiparticle Photon Counter, or SQPC) for submillimeter astronomy that could detect individual photons. These devices measure the quasiparticles generated breaking Cooper-pairs by photon absorption. This photoconductive type of device could yield high quantum efficiency, few s response times, and sensitivities in the range of 10 -20 W/...

Tantalum superconducting tunnel junctions for infrared photon counting

Superconducting Tunnel Junctions (STJ) are currently being developed as photon detectors for a wide range of applications. Interest comes from their ability to cumulate photon counting with chromaticity (i.e. energy resolution) from the Near InfraRed (NIR) to the X rays wavelengths and excellent quantum efficiency up to 80%. Resolving power can reach more than 10 in the visible. Our main goal i...

High Accuracy Calibration of Photon-Counting Detectors

We discuss a practical implementation of a photon-counting detector calibration using correlated photon pairs produced by parametric down-conversion. In this calibration scheme, the detection of a first photon triggers the measurement sequence aimed at detection of a second photon by a detector under test (DUT). We also describe measurements of radiant power with a photon-counting detector, whi...

Projection-Based Denoising Method for Photon-Counting Energy-Resolving Detectors

In this paper, we present a novel projection-based novel noise reduction method for photon counting energy resolving detectors in Spectral Computed Tomography (CT) imaging. In order to denoise the projection data, a guidance image from all energy channels is computed, which employs a variant of the joint bilateral filter to denoise each energy bin individually. The method is evaluated by a simu...