Patent ID: 7138619
Filing Date: 2006-11-21
Classification: G01J,G02B,H01L

Abstract:
1. A method for multi-spectral imaging comprising the steps of: for simultaneous detection of a first wavelength range and a second wavelength range of radiation comprising: receiving, on a multi-layered beam splitter, of the type having alternating coating layers having relatively high and low indices of refraction disposed on a substrate having a relatively high index of refraction, radiation in the first wavelength range and in the second wavelength range; reflecting a portion of reflected radiation which comprises the first wavelength range; transmitting radiation comprising the second wavelength range through a first layer having a relatively high index of refraction of a second layer having a relatively low index of refraction and a substrate; reflecting a portion of a non-reflected portion of the radiation in a manner that is constructively added to the first portion of reflected radiation at a first design wavelength; reflecting a portion of the non-reflected portion of the radiation in a manner that is destructively added to the first portion of reflected radiation at a second design wavelength; maintaining a spatial relationship between the reflected first wavelength range of radiation and the second wavelength range of radiation transmitted through the substrate; detecting a first image in the reflected first wavelength range of radiation; detecting a second image in the second wavelength range of radiation transmitted through the substrate; and creating a multi-spectral image by combining the first image and the second image.