Launching focused surface plasmon in circular metallic grating
- Department of Physics, Raj Kumar Goel Institute of Technology, Ghaziabad 201003, UP (India)
- Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016 (India)
- Department of Physics, AIAS, Amity University, Noida 201303 (India)
- Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742 (United States)
The excitation of focused surface plasma wave (SPW) over a metal–vacuum interface embedded with circular surface grating is investigated theoretically. The normally impinged radiation imparts oscillatory velocity to free electrons that beats with the surface ripple to produce a nonlinear current, driving the SPW. As SPW propagates, it gets focused. The focused radiation has a maximum at the centre of grating and decreases beyond the centre due to diffraction. The amplitude of SPW is fixed for a given groove depth and increases rapidly around the resonance frequency. The intensity at the focus point depends on dimensions of the grating. It increases with the radiation frequency approaching the surface plasmon resonance. The scheme has potential applications for photonic devices and surface enhanced Raman scattering.
- OSTI ID:
- 22399193
- Journal Information:
- Journal of Applied Physics, Vol. 117, Issue 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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