公开(公告)号：US07557368B2

公开(公告)日：2009-07-07

申请号：US10506106

申请日：2003-03-03

申请人： John Hegarty ,  Liam Paul Barry ,  Herve Armel Francois Folliot ,  James Christopher O'Gorman

发明人： John Hegarty ,  Liam Paul Barry ,  Herve Armel Francois Folliot ,  James Christopher O'Gorman

IPC分类号： H01L29/205

CPC分类号： H01L31/105 ,  B82Y20/00 ,  H01L31/035236 ,  H01L31/108 ,  H01L31/1085

摘要： A semiconductor photodetector (1) for detecting short duration laser light pulses of predetermined wavelength in a light signal (2) comprises a micro-resonator (3) of vertical Fabry-Perot construction having a Bragg mirror pair, namely, a front mirror (5) and a rear mirror (6) with an active region (8) located between the front and rear mirrors (5,6). An N-type substrate (11) supports the rear mirror (6). The light signal (2) is directed into the active region (8) through the front mirror (5) while a pump beam (17) is directed into the active region (8) at an end (18) thereof. The spacing between the front and rear mirrors (5,6) is such as to cause light of the predetermined wavelength to resonate between the mirrors (5,6). The semiconductor material of the active region (8) is selected so that one photon from each of the light signal (2) and the pump beam (17) are required to transfer one electron from a valence band (21) of the active region (8) across a bandgap (22) to a conduction band (20) so that the active region operates on the principle of Two-Photon Absorption. On the active region (8) being simultaneously subjected to the pump beam and light of the predetermined wavelength in the light signal (2) electrons are transferred by Two-Photon Absorption from the valence band (21) to the conduction band (20), thus causing a change in the voltage developed across the active region (8). The change in voltage is detected between an electrode (15) on the substrate (11) and electrodes (8) on the front mirror (5) thereby indicating the presence of light of the predetermined wavelength in the light signal (2).

摘要翻译： 一种用于在光信号（2）中检测预定波长的短持续时间激光脉冲的半导体光电检测器（1）包括具有布拉格光束对的垂直法布里 - 珀罗结构的微谐振器（3），即前反射镜 ）和具有位于前后反射镜（5,6）之间的有源区域（8）的后反射镜（6）。 N型基板（11）支撑后反射镜（6）。 光信号（2）通过前反射镜（5）被引导到有源区域（8）中，而泵浦光束（17）在其端部（18）处被引导到有源区域（8）中。 前后反射镜（5,6）之间的间隔使得预定波长的光在反射镜（5,6）之间共振。 有源区域（8）的半导体材料被选择为使得来自光信号（2）和泵浦光束（17）中的每一个的一个光子需要从有源区域的价带（21）传送一个电子 8）穿过带隙（22）到导带（20），使得有源区域以双光子吸收原理工作。 在有源区域（8）同时经受泵浦光束和光信号（2）中的预定波长的光，电子通过双光子吸收从价带（21）转移到导带（20）， 从而导致在有源区（8）上产生的电压的变化。 在基板（11）上的电极（15）和前反射镜（5）上的电极（8）之间检测电压变化，从而指示在光信号（2）中存在预定波长的光。