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- W2079369283 abstract "Bulk thermal emittance sources possess incoherent, isotropic, and broadband radiation spectra that vary frommaterial to material. However, these radiation spectra can be drastically altered by modifying the geometry ofthe structures. In particular, several approaches have been proposed to achieve narrowband, highly directionalthermal emittance based on photonic crystals, gratings, textured metal surfaces, metamaterials, and shock wavespropagating through a crystal. Here we present optimized aperiodic structures for use as narrowband, highlydirectional thermal infrared emitters for both TE and TM polarizations. One-dimensional layered structureswithout texturing are preferable to more complex two- and three-dimensional structures because of the relativeease and low cost of fabrication. These aperiodic multilayer structures designed with alternating layers of siliconand silica on top of a semi-infinite tungsten substrate exhibit extremely high emittance peaked around thewavelength at which the structures are optimized. Structures were designed by a genetic optimization algorithmcoupled to a transfer matrix code which computed thermal emittance. First, we investigate the properties of thegenetic-algorithm optimized aperiodic structures and compare them to a previously proposed resonant cavitydesign. Second, we investigate a structure optimized to operate at the Wien wavelength corresponding to anear-maximum operating temperature for the materials used in the aperiodic structure. Finally, we present astructure that exhibits nearly monochromatic and highly directional emittance for both TE and TM polarizationsat the frequency of one of the molecular resonances of carbon monoxide (CO); hence, the design is suitable fora detector of CO via absorption spectroscopy." @default.
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- W2079369283 date "2014-09-12" @default.
- W2079369283 modified "2023-09-23" @default.
- W2079369283 title "Optimized aperiodic highly directional narrowband infrared emitters" @default.
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- W2079369283 doi "https://doi.org/10.1117/12.2061241" @default.
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