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Limiting Optical Diodes Enabled by the Phase Transition of Vanadium Dioxide
journal contribution
posted on 2018-06-20, 00:00 authored by Chenghao Wan, Erik H. Horak, Jonathan King, Jad Salman, Zhen Zhang, You Zhou, Patrick Roney, Bradley Gundlach, Shriram Ramanathan, Randall H. Goldsmith, Mikhail A. KatsA limiting
optical diode is an asymmetric nonlinear device that
is bidirectionally transparent at low power but becomes opaque when
illuminated by sufficiently intense light incident from a particular
direction. We explore the use of a phase-transition material, vanadium
dioxide (VO2), as an active element of limiting optical
diodes. The VO2 phase transition can be triggered by optical
absorption, resulting in a change in refractive index orders of magnitude
larger than what can be achieved with conventional nonlinearities.
As a result, a limiting optical diode based on incident-direction-dependent
absorption in a VO2 layer can be very thin, and can function
at low powers without field enhancement, resulting in broadband operation.
We demonstrate a simple thin-film limiting optical diode comprising
a transparent substrate, a VO2 film, and a semitransparent
metallic layer. For sufficiently high incident intensity, our proof-of-concept
device realizes broadband asymmetric transmission across the near-infrared,
and is approximately ten times thinner than the free-space wavelength.
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Optical Diodes EnabledVO 2 phase transitionvanadium dioxideindex ordersincident-direction-dependent absorptionVO 2 layerfree-space wavelengthproof-of-concept devicenonlinear deviceVanadium Dioxidediodebroadband operationincident intensityfield enhancementPhase Transitionlight incidentphase-transition materialVO 2 film
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