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All-optical switching of nonlinear hyperbolic metamaterials in visible and near-infrared regions

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Abstract

Taking advantage of the Kerr nonlinearities of metallic nanolayers and graphene (G) and the well-known pump–probe method, we show that 200-nm-wide slabs of hyperbolic metamaterial (HMM) composed of 14 vertically stacked unit cells can be switched all optically between the negative refraction regime (ON state) and the no-transmission regime (OFF state), when illuminated by appropriately chosen TE-polarized Gaussian pump and TM-polarized CW probe. Finite element method numerical simulations show that the HMM slab with unit cells made of Au/Al2O3 nanolayers suffering from a relatively large plasmonic loss exhibits an ON state transmittance spectrum limited to 52%–72% over the visible range of 585–600 nm, when a 500 V/μm pump signal is utilized. Similar numerical results obtained for the HMM slab whose unit cells are made of Au/Al2O3/G/Al2O3/Au nanolayers show that a 4 V/μm pump signal is enough to stimulate the Kerr effect, resulting in a 97% ON state transmittance over the ultra-narrowband of 803–805 nm. Moreover, simulations show that when the unit cells are made of Ag/Si/G/Si/Ag nanolayers, a 95-nm-wide ON state transmittance of 49%–99% over the IR range of 800–895 nm can be obtained with a 19.5 V/μm pump. The proposed HMM structures can be used as all-optical switches in future optical digital systems.

© 2015 Optical Society of America

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