Abstract
A broadband tunable absorber is designed and fabricated. The tunable absorber is comprised of a dielectric-metal-dielectric multilayer and plasmonic grating. A large size of tunable absorber device is fabricated by nano-imprinting method. The experimental results show that over 90% absorption can be achieved within visible and near-infrared regimes. Moreover, the high absorption can be controlled by changing the polarization of incident light. This polarization-sensitive tunable absorber can have practical applications such as high-efficiency polarization detectors and transmissive polarizer.
Highlights
Metamaterial absorbers composed of a noble metal and dielectric can be structured at subwavelength scale to have plasmon resonances from visible to near-infrared (NIR) wavelengths
Conventional metamaterial absorbers have relied on MIM resonators formed by multilayer structures with metal and dielectric including certain patterned structures[17,18,19,20]
Polarization sensitive optical devices present the possibility that light absorption, transmission and reflection can be actively controlled[25,26]; this trait is necessary to fundamental photonics technologies[18,27,28,29,30,31]
Summary
Metamaterial absorbers composed of a noble metal and dielectric can be structured at subwavelength scale to have plasmon resonances from visible to near-infrared (NIR) wavelengths. Polarization sensitive optical devices present the possibility that light absorption, transmission and reflection can be actively controlled[25,26]; this trait is necessary to fundamental photonics technologies[18,27,28,29,30,31]. Designs of narrowband polarization-sensitive absorber with bottle-like and cup-like structures have been proposed and numerically demonstrated[30], and one consisting of arrays of U-shaped resonators has been fabricated[31]. We experimentally demonstrate a polarization-sensitive tunable absorber based on plasmonic gratings that can actively control the light absorption over a broad-range of wavelength. The absorption can be actively controlled by adjusting the polarization of incidence light
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