研究目的
To demonstrate the sensitive detection of photons at broadband infrared wavelengths based on the nondegenerate two-photon absorption in the Si avalanche photodiodes.
研究成果
The study successfully demonstrated broadband infrared photon detection using ND-TPA in Si-APDs, with a linear intensity response observed at a pump power of 12.42 μW and an enhancement factor of 20. This method offers a potential solution for applications requiring sensitive infrared photon detection.
研究不足
The study is limited by the need for a high-intensity pump laser to achieve ND-TPA dominance, and the detection efficiency could be further enhanced with guided wave or microcavity structures.
1：Experimental Design and Method Selection:
The study utilized nondegenerate two-photon absorption (ND-TPA) in Si avalanche photodiodes (APDs) for infrared photon detection. The energy difference for infrared photon absorption was complemented by a high-intensity pump laser at 1550 nm.
2：Sample Selection and Data Sources:
The signal and pump pulses were co-generated from a broadband fiber laser, with the signal light covering 1700~1850 nm and the pump light at 1550 nm.
3：List of Experimental Equipment and Materials:
A mode-locked Er-doped fiber laser oscillator, bandpass filter, germanium infrared optical window, dichroic mirror, and fiber-coupled single-photon detector based on Si-APD were used.
4：Experimental Procedures and Operational Workflow:
The pump and signal beams were combined and coupled into the Si-APD detector. The temporal delay between the two beams was adjusted to ensure ND-TPA effect.
5：Data Analysis Methods:
The photon-counting rate was recorded as a function of the incident photon flux and pump power, with data background-corrected to remove noise offset.
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