Semiconductor Photonic Nanocavity on a Paper Substrate

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Journal Article
Advanced Materials, 2016, 28 (44), pp. 9765 - 9769
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An optical component consisting of a semiconductor material which works on a biodegradable paper substrate was proposed. A transfer-printing technique involving the use of a microscale polydimethylsiloxane (PDMS) stamp was used to transfer an optical nanocavity selectively. A 1D photonic crystal nanobeam cavity made of InGaAsP is used. We numerically show that the optical cavity on paper, which has a refractive index of =1.46 at 1.55 μm, has a Q-factor which exceeds 48 000. We experimentally demonstrate that a photonic crystal nanocavity on paper operates as a laser with a threshold power of =0.2 mW, representing the first demonstration of photonic components working directly on a paper substrate. Water is automatically transported to a nanobeam structure one centimeter away to change the surrounding refractive indices, resulting in a resonant peak shift of 27.1 nm. A finite-different time-domain (FDTD) simulation is used to compute the Q-factor and resonant wavelength of a photonic nanocavity. It was found that paper has a relatively low refractive index of 1.46, which is comparable to that of a glass substrate, while the photonic nanobeam has a high refractive index of 3.4.
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