Tunable dual-band perfect absorbers based on extraordinary optical transmission and Fabry-Perot cavity resonance.

Magnetic resonance is considered to be a necessary condition for metamaterial perfect absorbers, and dual-band absorbers can be composed of a pair of metallic layers with anti-parallel surface currents. We designed and fabricated a tunable dual-band perfect absorber based on extraordinary-optical-transmission (EOT) effect and Fabry-Perot cavity resonance. The idea and the mechanism are completely different from the absorber based on the near-field interaction. The important advantage of our structure is that we can switch a single-band absorber to a dual-band absorber by changing the distance between two metallic layers and/or incident angle. The peak originating from the EOT effect becomes significantly narrower, resulting in an increase of the Q-factor from 16.88 to 49. The dual-band absorber can be optimized to be insensitive to the polarization of the incident electromagnetic wave by slightly modifying the absorber structure.

[1]  Iam-Choon Khoo,et al.  Polarization-independent dual-band infrared perfect absorber based on a metal-dielectric-metal elliptical nanodisk array. , 2011, Optics express.

[2]  Abul K. Azad,et al.  Perfect subwavelength fishnetlike metamaterial-based film terahertz absorbers , 2010 .

[3]  D. Cumming,et al.  A terahertz polarization insensitive dual band metamaterial absorber. , 2011, Optics letters.

[4]  M. Hentschel,et al.  Infrared perfect absorber and its application as plasmonic sensor. , 2010, Nano letters.

[5]  Yongzhi Cheng,et al.  Multi-band metamaterial absorber using cave-cross resonator , 2011 .

[6]  Pei Ding,et al.  Dual-band perfect absorption and field enhancement by interaction between localized and propagating surface plasmons in optical metamaterials , 2011 .

[7]  Willie J Padilla,et al.  Perfect metamaterial absorber. , 2008, Physical review letters.

[8]  Zeyu Zhao,et al.  Realizing near-perfect absorption at visible frequencies. , 2009, Optics express.

[9]  Willie J. Padilla,et al.  A dual band terahertz metamaterial absorber , 2010 .

[10]  Willie J Padilla,et al.  Infrared spatial and frequency selective metamaterial with near-unity absorbance. , 2010, Physical review letters.

[11]  Willie J Padilla,et al.  Taming the blackbody with infrared metamaterials as selective thermal emitters. , 2011, Physical review letters.

[12]  Huaiwu Zhang,et al.  Dual band terahertz metamaterial absorber: Design, fabrication, and characterization , 2009 .

[13]  Houtong Chen Interference theory of metamaterial perfect absorbers. , 2011, Optics express.

[14]  Liang Peng,et al.  Enhanced transmission of transverse electric waves through periodic arrays of structured subwavelength apertures. , 2009, Optics express.

[15]  J. Hao,et al.  Nearly total absorption of light and heat generation by plasmonic metamaterials , 2011 .

[16]  Yang Yang,et al.  A wide-angle polarization-insensitive ultra-thin metamaterial absorber with three resonant modes , 2011 .

[17]  Changtao Wang,et al.  Design principles for infrared wide-angle perfect absorber based on plasmonic structure. , 2011, Optics express.