University of Connecticut, Electrical and Computer Engineering Department, 371 Fairfield Way, Unit 2157, Storrs, Connecticut 06269, USA.
Opt Lett. 2011 Jul 1;36(13):2501-3. doi: 10.1364/OL.36.002501.
A fast, simple, and low-cost optical time-gating scheme for counting single photons is presented. Its construction consists of a silicon photodiode connected in series with a 50 Ω resistor and that operates in the photoconductive mode. The temporal resolution at the FWHM of the photon counting system was measured to be 62 ps. The profile of a single-photon pulse measured with the counting system agreed well with analytical results. The system was also used to successfully resolve a pair of targets with 4 mm separation inside a highly scattering medium by the use of time-gated early-arriving photons.
提出了一种快速、简单且低成本的用于单光子计数的光门控方案。其结构由一个硅光电二极管与 50 Ω 电阻串联组成，并工作在光电导模式下。光子计数系统的时间分辨率在 FWHM 处测量为 62 ps。用计数系统测量的单光子脉冲的轮廓与分析结果吻合良好。该系统还通过使用时间门控的早期到达光子，成功地分辨出高度散射介质中相隔 4 毫米的一对目标。
