【研究成果】2012
研究成果40
Spectral Control of Thermal Radiation by Metasurface with Split-Ring Resonator
Yosuke Ueba and Junichi Takahara
Appl. Phys. Express 5(2012) 122001
Microscope image of Gold SRRs fabricated on the silver-inserted substrate. Inset: enlarged image of the sample (left) and conceptual design of SRR array for thermal radiation control.
Relative emittance of SRRs with the length Ly . 3:2, 2.6, and 2.1 um from (a) experimental results and (b) numerical results. The electric field is polarized parallel to the SRR gap (red) and perpendicular to it (blue). Insets show microscope images of a unit cell of SRR. For the polarization perpendicular to the SRR gap, peak positions blue-shift with decreasing height of SRR Ly.
We demonstrated experimentally for the first time in the world that the spectra of thermal radiation can be controlled by using a split-ring resonator (SRR) structure. Our calculations clearly showed that the experimental results can be attributed to SRR resonances. Furthermore, we achieved the artificial shift of the peak positions of the resonance with changing the length of the SRR structure. The functions of the metasurface discussed here will lead to thin-film emitters (from terahertz to visible frequency) in the future. The fabrication and measurement apparatuses in the Photonics Center are utilized for this experiment.
