Abstract
We report a thin nanostructured dielectric optical coating with a nearly ideal polarization insensitive reflectance at a wavelength of 3.46 μm. A genetic algorithm was used to optimize the doubly periodic amorphous silicon subwavelength nanostructure to satisfy a metamaterial-enabled reflecting condition at this resonance wavelength. Optical measurements of the nanofabricated dielectric coating had a peak reflectance of 99.76 at 3.46 μm, showing strong agreement with simulation. The average reflectance measured at nine positions on a 2.54 cm × 2.54 cm coating demonstrated a high optical uniformity of 99.5 ± 0.1 across the large-area component. These results outline a route to design and manufacture low-loss metamaterial-enabled dielectric optical coatings.
Original language | English (US) |
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Article number | 171114 |
Journal | Applied Physics Letters |
Volume | 102 |
Issue number | 17 |
DOIs | |
State | Published - Apr 29 2013 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)