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中国物理B：英文版

Single-photon modulation spectrum

刘岩, 于波, 何博, 张国峰, Liantuan Xiao, 贾锁堂

Published Jan 1, 2014• 0 citations
OpenAlex

Abstract

We present a robust method of single-photon modulation by directly modulating the single photons and observe its fre- quency spectrum. Compared with conventional photon counting technique, the single-photon modulation spectrum shows that the method could not only realize high-frequency modulation but also obtain higher signal-to-noise ratio. Moreover, the theoretical calculations show good agreement with the experimental results.

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Photon counting has been widely used in weak light even to single photon detection.However,the Shot noise of photon-counting N for Poisson statistics seriously affects the sensitivity.A method using wavelength modulation spectroscopy technique to improve signal-to-noise ratio of photon-counting is presented.The light from an external cavity diode laser is wavelength modulated and then chopped to a series of laser pulses by using a acoustic-optical modulator,the counts of fluorescence photon are recorded and then converted to an analog signal.The analog signal is added to a lock-in amplifier for harmonic demodulation using lock-in method.The fluorescence spectrum is the 6S_1/2(F=4)→6P_3/2 transition of Cs D_2 line and the detected probability of photon is 35%.The experimental demonstration has achieved a 51 dB signal-to-noise improvement factor in 2f harmonic detection.The minimum detectable count here is 3×10-4 with the residual noise 7.54 μV.The results show a potential application in fluorescence detection of cold molecules or single molecule.
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