Gold absorbers based on plasmonic tapered coaxial holes (PTCHs) are demonstrated theoretically and experimentally. An average absorption of over 0.93 is obtained theoretically in a broad wavelength range from 300 nm to 900 nm without polarization sensitivity due to the structural symmetry. Strong scattering of the incident light by the tapered coaxial holes is the main reason for the high absorption in the short wavelength range below about 550 nm, while gap surface plasmon polaritons propagating along the taper dominate the resonance-induced high absorption in the long wavelength range. Combining two PTCHs with different structural parameters can further enhance the absorption and thus increase the spectral bandwidth, which is verified by a sample fabricated by focused ion beam milling. This design is promising to be extended to other metals to realize effective and efficient light harvesting and absorption.
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- Enhanced Broadband Absorption in Gold by Plasmonic Tapered Coaxial Holes
- Mo, Lei (Author)
- Yang, Liu (Author)
- Nadzeyka, Achim (Author)
- Bauerdick, Sven (Author)
- He, Sailing (Author)
- Ira A. Fulton Schools of Engineering (Contributor)
- Digital object identifier: 10.1364/OE.22.032233
- Identifier TypeInternational standard serial numberIdentifier Value1094-4087
- This paper was published in OPTICS EXPRESS and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OE.22.032233, opens in a new window. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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Mo, Lei, Yang, Liu, Nadzeyka, Achim, Bauerdick, Sven, & He, Sailing (2014). Enhanced broadband absorption in gold by plasmonic tapered coaxial holes. OPTICS EXPRESS, 22(26), 32233-32244. http://dx.doi.org/10.1364/OE.22.032233