title: Hybrid superprism with low insertion losses and suppressed cross-talk.
abstract: We demonstrate with the two-dimensional finite-difference time-domain method that an adiabatic transition in a superprism with an interface along the [1 2 ] direction enhances the transmission through the superprism to more than 90% (-0.5 dB) over the wavelength range 1.47-1.68 mum , 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.
authors.affiliation: Department of Electrical Engineering, California Institute of Technology, Mail Code 136-93, Pasadena, California 91125, USA.
authors.forename: Jeremy
authors.initials: J
authors.lastname: Witzens
authors.forename: Thomas
authors.initials: T
authors.lastname: Baehr-Jones
authors.forename: Axel
authors.initials: A
authors.lastname: Scherer