Abstract
We report on the evolution of the surface plasmon (SP) and waveguide mode (WM) as the core thickness is varied in InGaAs slab waveguides covered by metallic sub-wavelength slit arrays. By comparing transmission spectrum in the near-infrared region with numerical simulations, transmission dips were assigned to resonant excitations of either SPs or WMs. As the core thickness was smaller than the SP penetration depth, the resonance energy exhibits a blue shift, which scales with the field intrusion into the substrate region. For the core thickness of 400 nm supporting both the WM and SP, effective refractive index of the SP is almost constant due to the field decay within the InGaAs region, which is different to the case of the WM.
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Acknowledgments
This work was supported by the National Research Foundation of Korea Grants funded by the Korean Government (Basic Science Research Program: 2012-000968, 2012 University-Institute cooperation program, SRC: 2008-0062254). SKN acknowledges the NRF of Korea through a grant provided by MEST in 2007 (No. 2007-00011). K J. Ahn acknowledges supports from the Global Frontier R&D Program on Center for Multiscale Energy System (2012M3A6A7054864).
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Kim, S.H., Lee, C.M., Park, D.W. et al. Evolution of surface plasmon resonance with slab thickness in hybrid nano-structures of Au/InGaAs slab waveguide. Appl. Phys. B 115, 77–83 (2014). https://doi.org/10.1007/s00340-013-5575-2
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DOI: https://doi.org/10.1007/s00340-013-5575-2