Abstract: A non-contact method to impart a texture to a surface using laser irradiation uses an excimer laser to illuminate a sample immersed in a halocarbon ambient thereby initiating a photo/thermal chemical reaction which etches the sample only in the area illuminated with sufficient laser fluence. The resulting etched area can be repetively illuminated and etched to provide a textured surface to reduce extraneous reflections, or for micromachining, decorative texturing and marking. This technique is particularly well suited to improve the performance of backside illuminated CCDs by reducing the background (dark) signal, increase resolution and responsivity uniformity. The technique is compatible with other laser processing procedures and can be implemented with a variety of CCD enhancements such as improved dark current and blue response from laser doping or activation of backside implants.
Type:
Grant
Filed:
September 26, 1990
Date of Patent:
November 17, 1992
Assignee:
The United States of America as represented by the Secretary of the Navy
Inventors:
Stephen D. Russell, Douglas A. Sexton, Eugene P. Kelley