About the cover

February 2013 Volume 12 No 2

A critical component for chip-scale integrated photonics would be a non-reciprocal optical waveguide allowing light to travel in only one direction while reflecting it in the opposite one. Inspired by concepts of parity-time-symmetric quantum theories and built on a silicon on-insulator platform using only absorptive media, a periodically modulated dielectric waveguide exhibiting unidirectional reflection has now been demonstrated, reflecting light at telecom frequencies in only one direction with a high contrast ratio.

Letter p108

IMAGE: LIANG FENG, CALIFORNIA INSTITUTE OF TECHNOLOGY; MING-HUI LU, NANJING UNIVERSITY

COVER DESIGN: DAVID SHAND

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