Journal
OPTICS EXPRESS
Volume 22, Issue 26, Pages 32233-32244Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.032233
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Funding
- National Natural Science Foundation of China [61307078, 91233208, 91233119]
- National High Technology Research and Development Program (863) of China [2012AA030402]
- Zhejiang Provincial Key Project [2011C11024]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130101120134]
- Fundamental Research Funds for the Central Universities
- China Scholarship Council
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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. (c) 2014 Optical Society of America
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