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Title: Effects of surface diffusion on high temperature selective emitters

Using morphological and optical simulations of 1D tantalum photonic crystals at 1200K, surface diffusion was determined to gradually reduce the efficiency of selective emitters. This was attributed to shifting resonance peaks and declining emissivity caused by changes to the cavity dimensions and the aperture width. Decreasing the structure’s curvature through larger periods and smaller cavity widths, as well as generating smoother transitions in curvature through the introduction of rounded cavities, was found to alleviate this degradation. An optimized structure, that shows both high efficiency selective emissivity and resistance to surface diffusion, was presented.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [1]
  1. MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States). Dept. of Materials Science and Engineering and Inst. for Soldier Nanotechnologies
  2. MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States). Inst. for Soldier Nanotechnologies and Research Lab. of Electronics
  3. MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States). Inst. for Soldier Nanotechnologies
Publication Date:
Grant/Contract Number:
SC0001299; DE–SC0001299
Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 23; Journal Issue: 8; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1222298
Alternate Identifier(s):
OSTI ID: 1184793