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Hybrid Superprism with Low Insertion Losses and Suppressed Cross-Talk

Research Area: Nanophotonics Year: 2005
Type of Publication: Article Keywords: finite-difference time-domain, superprism, photonic crystal
Authors: Witzens, Jeremy; Baehr-Jones, Tom; Scherer, Axel
Journal: Physical Review E Volume: 71
Number: 2 Pages: 026604
We demonstrate with the two-dimensional finite-difference time-domain method that an adiabatic transition in a superprism with an interface along the [1 2̅ ] direction enhances the transmission through the superprism to more than 90% (−0.5 dB) over the wavelength range 1.47–1.68 μm, including the telecommunication C and L bands. We also show that diffraction governed by a quasinegative index of refraction inside the superprism can be used to obtain nearly transform-limited beam widths at the output of the superprism. The reduction of the beam width at the output suppresses cross-talk and greatly enhances the achievable frequency resolution of the superprism.
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