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Wavelength-tunable perfect absorber based on guided-mode resonances

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Abstract

We numerically investigate the triple-band perfect absorption in a metal-insulator-metal structure. The absorption peak from the TE-polarized guided-mode resonance (GMR) is highly sensitive to the incident angle. Thus a wavelength-tunable perfect absorber (PA) based on the TE GMR is proposed for the first time. By the precise control of the incident angle, the 5nm narrowband perfect absorber can be modulated linearly about 3 nm/° in our structure. For single frequency light, the intensity tunability of the absorption between 6.2%–99.27% is realized only by changing the incident angle of 5°. The further study focused on TM polarization confirms the possibility to realize a polarization-independent wavelength-tunable PA. Such a PA possesses potential for applications in absorption filter, thermal emitter, surface-enhanced Raman scattering, biosensing, and nonlinear optics.

© 2016 Optical Society of America

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