What is it about?
We describe how we integrated superconducting nanowire single-photon detectors (SNSPD) within a SWIFTS microspectrometer. The nanowires are aligned under a ridge waveguide, that forms a loop in order to create a standing-wave interference pattern. That interference pattern can be measured by the single-photon detectors, with the aim of calculating the spectrum of the injected light (via inverse Fourier transform). It is the first time the SWIFTS concept is attempted with SNSPDs, with an attempt of direct measurement of the interference pattern (instead of pattern projection as was previously done).
Photo by Laura Ockel on Unsplash
Why is it important?
Despite the nanowires not all being functional, we show that we are capable of measuring clear variations within the interference pattern, which proves the validity of the concept. This is the first demonstrated integration of SNSPDs with waveguides, and within a more elaborated device. This is also the first demonstration of in-situ interferogram measurement.
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This page is a summary of: Light interference detection on-chip by integrated SNSPD counters, AIP Advances, December 2011, American Institute of Physics, DOI: 10.1063/1.3656744.
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