Experimental evidence for superprism phenomena in SOI photonic crystals

Abstract

A first experimental demonstration of a planar superprism in silicon microphotonics technology using silicon on insulator (SOI) substrates is presented. Experimental results for anomalous wavelengthdependent angular dispersion in SOI triangular lattice planar photonic crystals are reported. An angular swing of 14 degrees is measured for light propagating near the Gamma-K direction as the input wavelength is changed from 1295 nm to 1330 nm, which corresponds to an angular dispersion of 0.4 degrees /nm. For the Gamma-M direction, a negative wavelength dispersion has been recorded. An opposite sign angular deviation of 21 degrees is observed as the input wavelength is changed from 1316 nm to 1332 nm, i.e. a dispersion of 1.3 degrees /nm.

Optimize design super collimation in square lattice two-dimensional photonic crystals

“…Unlike spatial solitons, there is no beam focusing (diffraction compensation) due to nonlinearities. Instead, PhCs can be designed to have dispersion properties that allow incident waves to naturally collimation in certain directions [6].…”

Experimental Evidence for Superprism Effects in Three‐Dimensional Polymer Photonic Crystals

“…[18] Since then, many theoretical publications have addressed the calculation of the dispersion properties of 2D [19] as well as 3D [20] PCs, but only very few groups have ever given experimental evidence for super-refraction inside 2D PCs. [21] The only experimental evidence for SP effects in a 3D PC was that reported by Kosaka et al, who used a periodic arrangement of silicon and silica in a hexagonal, graphite-like lattice that was formed by means of layer-by-layer self-organization. [22] However, they could not demonstrate the highly dispersive light propagation for a continuous range of wavelengths.…”

Photonic Crystals: Physics, Fabrication, and Devices

“…The superprism effect was also demonstrated in low-index contrast 3D polymeric photonic crystals [56]. Wavelength sensitivities were experimentally measured in 2D photonic crystals [133,134]. These experiments corroborated that the beam direction in a photonic crystal does change sensitively with wavelength.…”