Electromagnetic wave analogue of electronic diode

Details Electromagnetic wave analogue of electronic diode Electromagnetic wave analogue of electronic diode

2010-10-28

arxiv.org/abs/1010.5830v1

New Journal of Physics 13, 033025-9 (2011)

Physics

Optics

10 pages, 4 figures

Scientific paper

10.1088/1367-2630/13/3/033025

An electronic diode is a nonlinear semiconductor circuit component that allows conduction of electrical current in one direction only. A component with similar functionality for electromagnetic waves, an electromagnetic isolator, is based on the Faraday effect of the polarization state rotation and is also a key component of optical and microwave systems. Here we demonstrate a chiral electromagnetic diode, which is a direct analogue of an electronic diode: its functionality is underpinned by an extraordinary strong nonlinear wave propagation effect in the same way as electronic diode function is provided by a nonlinear current characteristic of a semiconductor junction. The effect exploited in this new electromagnetic diode is an intensity-dependent polarization change in an artificial chiral metamolecule. This microwave effect exceeds a similar optical effect previously observed in natural crystals by more than 12 orders of magnitude and a direction-dependent transmission that differing by a factor of 65.

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