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The authors report high‐temperature stable, spectrally tunable, Pt/alumina hyperbolic metafilms with broadband absorption. Two uniform pairs of Pt (10 nm)/alumina (100, 150, or 200 nm) multilayer films with a top alumina passivation layer and a bottom Pt mirror and are prepared on sapphire substrates by sputtering. These Pt/alumina multilayer films yielded strong light absorption at visible to near‐infrared...
We investigated the effect of a mesh‐type GaN/SiO2/Al omnidirectional reflector (ODR) on the light output power of AlGaN/InGaN‐based ultraviolet (365 nm) LEDs and compared their performance with that of LEDs with a GaN/ITO/Al reflector. Using the scattering matrix method, the normal incidence reflectance was calculated to be 93.7% for the GaN/SiO2 (62 nm)/Al ODR and 79% for the GaN/ITO (30 nm)/Al...
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