| 摘要 |
A method of improving detection performance in a system that illuminates a target with optical energy having a modulated periodic waveform that includes a high frequency component and that detects with at least one semiconductor photodetector a fraction of said optical energy reflected by said target. The method comprises providing each said semiconductor photodetector with a first group and a second group of spaced-apart elongated structures formed on a substrate, wherein a distance in an x-direction separating adjacent said structures is substantially less than a length in a y-direction of said structures. The method further comprises dynamically biasing said semiconductor photodetector such that detection-generated charge within said substrate is moved at a first rate in said x-direction for local collection by at least at a first region of said elongated structures, and at least some of said detection-generated charge at said first region is moved at a second rate in said y-direction for collection at a second region of said elongated structures. Performance of said semiconductor photodetector is substantially dependent on said first rate and is substantially independent of said second rate. Also, a CMOS-implementable semiconductor photodetector for use in a system for carrying out the method. |
