Spectrally-Selective Metamaterial Emitter
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United States of America Patent
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Issued Date -
Aug 13, 2015
app pub date -
Feb 13, 2014
filing date -
Feb 13, 2014
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Abstract
A spectrally-selective metamaterial emitter includes bull's eye (circular target-shaped) structures disposed on a base substrate and including concentric circular ridges separated by circular grooves and set at a fixed grating period (e.g., in the range of 10 nanometers to 5 microns). When the base substrate is heated to a high temperature (i.e., above 1000° K), thermally excited surface plasmons generated on the concentric circular ridges produce a highly directional, narrow band energy beam having a peak emission wavelength that is roughly equal to the fixed grating period. The metamaterial emitter is fabricated using known photolithographic (e.g., combination of primary pattern generation and sputtering or dry etching) fabrication techniques, and utilizes an all-metal structure (preferably refractory metal) to withstand optimal operating temperatures (i.e., approaching 1500° K). Multiple bull's eye structures are formed in a multiplexed (overlapping) pattern and with different grating periods to produce a wide area beam having a broad emission spectrum.
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