Single photon detection using a resonator with an absorber
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United States of America Patent
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Jun 4, 2019
Grant Date -
Jan 11, 2018
app pub date -
Feb 17, 2017
filing date -
Feb 18, 2016
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Abstract
A single photon detector (SPD) includes a resonator to store probe photons at a probe wavelength and an absorber disposed in the resonator to absorb a signal photon at a signal wavelength. The absorber is also substantially transparent to the probe photons. In the absence of the signal photon, the resonator is on resonance with the probe photons, thereby confining the probe photons within the resonator. Absorption of the signal photon by the absorber disturbs the resonant condition of the resonator, causing the resonator to release multiple probe photons. A photodetector (PD) then detects these multiple probe photons to determine the presence of the signal photon.
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