Abstract
Efficient broadband absorption of visible and near-infrared light by low
quality-factor metal-insulator-metal (MIM) resonators using refractory materials is
reported. Omnidirectional absorption of incident light for broad angles of incidence and
polarization insensitivity are observed for the fabricated MIM resonator. Excellent
thermal stability of the absorber is demonstrated at high operating temperatures (800 °C).
The experimental broadband absorption spectra show good agreement with simulations.
The resonator with 12 nm top tungsten and 100 nm alumina spacer film shows
absorbance above 95% in the range of 650 to 1750 nm. The absorption window is tunable
in terms of the center wavelength, bandwidth, and the value of maximum absorbance
(~98%) by simple variation of appropriate layer thicknesses. Owing to their flexibility,
ease of fabrication and low cost, the presented absorbers have the potential for a wide
range of applications, including the use in commonly used infrared bands or absorbers for
(solar) thermo-photovoltaic energy conversion, where high absorbance and
simultaneously low (thermal) re-radiation is of paramount importance.
quality-factor metal-insulator-metal (MIM) resonators using refractory materials is
reported. Omnidirectional absorption of incident light for broad angles of incidence and
polarization insensitivity are observed for the fabricated MIM resonator. Excellent
thermal stability of the absorber is demonstrated at high operating temperatures (800 °C).
The experimental broadband absorption spectra show good agreement with simulations.
The resonator with 12 nm top tungsten and 100 nm alumina spacer film shows
absorbance above 95% in the range of 650 to 1750 nm. The absorption window is tunable
in terms of the center wavelength, bandwidth, and the value of maximum absorbance
(~98%) by simple variation of appropriate layer thicknesses. Owing to their flexibility,
ease of fabrication and low cost, the presented absorbers have the potential for a wide
range of applications, including the use in commonly used infrared bands or absorbers for
(solar) thermo-photovoltaic energy conversion, where high absorbance and
simultaneously low (thermal) re-radiation is of paramount importance.
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Optical Materials Express |
| Vol/bind | 6 |
| Udgave nummer | 8 |
| Sider (fra-til) | 2704-2714 |
| ISSN | 2159-3930 |
| DOI | |
| Status | Udgivet - 2016 |