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A nanocavity structure is embedded inside a silicon logpile photonic crystal that demonstrates tunable absorption behavior at near visible wavelengths well beyond the absorption edge of silicon. This is due to silicon’s indirect bandgap resulting in a relatively slow increase in the absorption of silicon with decreasing wavelength. Our results open up the possibility of utilizing the wide, complete...
Three‐dimensional photonic crystals with an omnidirectional bandgap at visible frequencies can have significant impact on solid‐state lighting and solar‐energy conversion. Using a procedure based on multistep electron‐beam lithographic processing, a 9‐layer log‐pile photonic crystal is fabricated composed of 70‐nm‐wide titanium dioxide rods with 250‐nm lattice spacing that exhibit a stacking direction...
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