Plasmonic Notch Filter Design Based on Long-range Surface Plasmon Excitation Along Metal Grating
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A single notch plasmonic spectral filter design using evanescently coupled resonant ultrathin metal grating is numerically studied in this article. Due to excitation and coupling of long range surface plasmon between the metal grating nanowires, a deep and narrow reflection spectrum dip can be obtained. Narrower spectral bandwidth is achieved through decreased damping from the existence of large dielectric gaps between the grating nanowires. This physical explanation is confirmed by the field distribution calculation. As an example, a single notch filter design with full width half maximum band width less than 3 nm centered at 808 nm is presented.
KeywordsSurface plasmon Notch filter Metal grating Evanescent wave
Zhi Wu is supported by Dayton Area Graduate Studies Institute Graduate Scholarship.
- 1.Raether H (1988) Surface Plasmons on smooth and rough surfaces and on gratings. Springer, BerlinGoogle Scholar
- 2.Schildkraut JS (1988) Long-range surface plasmon electrooptic modulator. Appl Opt 27(21):4587–4590Google Scholar
- 9.Wang Y, Pain B (1999) Scanning surface-plasmon filters for miniature spectrometers. NASA, Washington, DC Tech. Brief 23, NPO-20179Google Scholar
- 19.Quail JC, Rako JG, Simon HJ (1983) Long-range surface-plasmon modes in silver and aluminum films. Opt Lett 8(7):377–379Google Scholar
- 20.Palik ED (1998) Handbook of optical constants of solid. Academic, San DiegoGoogle Scholar
- 21.Moharam MG, Grann EB, Pommet DA (1995) Formulation for stable and efficient implementation of the rigorous coupled-wave analysis of binary gratings. J Opt Soc Am A 12(5):1068–1076Google Scholar
- 22.Moharam MG, Pommet DA, Grann EB, Gaylord TK (1995) Stable implementation of the rigorous coupled-wave analysis for surface-relief gratings: enhanced transmittance matrix approach. J Opt Soc Am A 12(5):1077–1086Google Scholar