CST – Computer Simulation Technology

Title:
Transparent subdiffraction optics: nanoscale light confinement without metal
Author(s):
SAMAN JAHANI AND ZUBIN JACOB
Source:
Optica
Vol./Issue/Date:
Vol. 1, no. 2, August 2014
Year:
2015
Page(s):
pp. 96-100
Abstract:
The integration of nanoscale electronics with conventional optical devices is restricted by the diffraction limit of light. Metals can confine light at the subwavelength scales needed, but they are lossy, while dielectric materials do not confine evanescent waves outside a waveguide or resonator, leading to cross talk between components. We show that light can be confined below the diffraction limit using completely transparent artificial media (metamaterials with e>1,?µ=1 ). Our approach relies on controlling the optical momentum of evanescent waves—an important electromagnetic property overlooked in photonic devices. For practical applications, we propose a class of waveguides using this approach that outperforms the cross-talk performance by 1 order of magnitude as compared to any existing photonic structure. Our work overcomes a critical stumbling block for nanophotonics by completely averting the use of metals and can impact electromagnetic devices from the visible to microwave frequency ranges.
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