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Abstract
Long-range surface plasmon polariton waveguides composed with thin gold stripes embedded in SU-8 polymer cladding with various stripe widths were fabricated. Material properties of the polymer cladding layer, gold thin film, and the device structures were discussed. Optical properties based on modal propagation were characterized at visible to near-infrared wavelengths. The measured propagation losses of waveguide widths from 3 to 9 μm at 633, 785, and 1550 nm are 7.5-18.8, 6.8-12.5, and 1.9-3.9 dB/mm, respectively. Guiding mode properties such as overlap integrals between the simulated and the measured fields and the polarization extinction ratios of the waveguides with different stripe widths were investigated at the telecommunication wavelength. Good accordance between the measurement and simulation results was presented.
Highlights
The interaction of light in the nanometer scale has gained a lot of attention during the past decade.The unique properties of metal with the interaction of light have led to the booming research fields of plasmonics
Surface plasmon polaritons (SPPs) can be excited and propagate along the metaldielectric interface through collective charges oscillations, where the real parts of the permittivity of both media are in opposite signs.[1]
The symmetric mode is less bound with the metal film and can propagate with low attenuation at an order longer length than a SPPs mode propagates along a single metal-dielectric interface,[3] which is called the long-range surface plasmon polaritons (LRSPPs) mode.[2,4]
Summary
The interaction of light in the nanometer scale has gained a lot of attention during the past decade.The unique properties of metal with the interaction of light have led to the booming research fields of plasmonics. The symmetric mode is less bound with the metal film and can propagate with low attenuation at an order longer length (a few millimeters in the infrared range) than a SPPs mode propagates along a single metal-dielectric interface,[3] which is called the long-range surface plasmon polaritons (LRSPPs) mode.[2,4] Due to the boundary conditions, only transverse magnetic (TM) polarized wave can be supported.[5]
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