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Proceedings Paper

Nanogap experiments for laser cooling: a progress report
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Paper Abstract

One of the challenges of laser cooling a semiconductor is the typically high index of refraction (greater than 3), which limits efficient light output of the upconverted photon. This challenge is proposed to be met with a novel concept of coupling the photon out via a thin, thermally insulating vacuum gap that allows light to pass efficiently by frustrated total internal reflection. This study has the goal of producing a test structure that allows investigation of heat transport across a 'nanogap' consisting of a thin film supported over a substrate by an array of nanometer-sized posts. The nanogap is fabricated monolithically by first creating a film of SiO2 on a silicon substrate, lithographically defining holes in the SiO2, and covering this structure including the holes with silicon. Selective lateral etching will then remove the SiO2, leaving behind a thin gap between two Si layers spaced apart by nanometer-scale Si posts. Demonstration of this final step by successfully undercutting the a-Si upper layer due to the hydrophobic nature of silicon and the slow etch rate of buffered oxide etch in the small gap has proved to be problematic. Arriving at a feasible solution to this conundrum is the current objective of this project in order to begin investigating the thermal conductivity properties of the structure.

Paper Details

Date Published: 7 March 2007
PDF: 4 pages
Proc. SPIE 6461, Laser Cooling of Solids, 64610H (7 March 2007); doi: 10.1117/12.708585
Show Author Affiliations
Ryan P. Martin, Ctr. for High Technology Materials, Univ. of New Mexico (United States)
Josef Velten, Ctr. for High Technology Materials, Univ. of New Mexico (United States)
Andreas Stintz, Ctr. for High Technology Materials, Univ. of New Mexico (United States)
Kevin J. Malloy, Ctr. for High Technology Materials, Univ. of New Mexico (United States)
Richard I. Epstein, Los Alamos National Lab. (United States)
Mansoor Sheik-Bahae, Univ. of New Mexico (United States)
Michael P. Hasselbeck, Univ. of New Mexico (United States)
Babak Imangholi, Univ. of New Mexico (United States)
S. T. P. Boyd, Univ. of New Mexico (United States)
Todd M. Bauer, Sandia National Lab. (United States)


Published in SPIE Proceedings Vol. 6461:
Laser Cooling of Solids
Richard I. Epstein; Mansoor Sheik-Bahae, Editor(s)

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