Optimized aperiodic broadband visible absorbers

Abstract

Abstract:We present optimized aperiodic structures for use as broadband thermal incandescent emitters which are capable of increasing the emittance by nearly a factor of two over the visible wavelength range when compared to bulk tungsten. These aperiodic multilayer structures are designed with alternating layers of tungsten and air or tungsten and silicon carbide on top of a tungsten substrate. We investigate the properties of these structures for use as lightbulb filaments. We find that these structures greatly enhance the emittance over the visible wavelength range, while also increasing the overall efficiency of the bulb and could lead to a decrease in incandescent lightbulb power consumption by nearly 50%.

Optical Fiber Photonic Crystal Hydrophone for Cellular Acoustic Sensing

“…1 d) [34]. The asymmetry of the spectral dips is due to diffractive losses in the optical cavity [9], [34] and can be modeled with a lossy transfer matrix method [9], [35]- [37]. The wavelengthdependent optical sensitivity of the hydrophone to cavity length changes is proportional to the slope of the reflection spectrum [4], [8], [9], [38].…”

Metal-Dielectric Thin Film Structure Metamaterial for Obtaining High Equilibrium Temperature Under Direct Solar Optical Radiation

“…Practically, it is easy to obtain wideband solar light absorption in visible spectrum, but difficult to completely suppress thermal emission in the infrared region. Previously, various multilayer thin film structures have been reported for obtaining wideband solar light absorption [4][5][6][7][8][9][10][11][12][13][14] and thermal emission control [15][16][17][18][19][20]. For solar energy systems, the temperature of a solar light absorber affects the efficiency of the system [15,[21][22][23].…”