Fig. 3: Simulation and experiment of single-pixel metasurface based on plasmonic quasi-bound state in the continuum (P-QBIC).
From: Electrically programmable pixelated coherent mid-infrared thermal emission
a SEM image of the P-QBIC pixel (scale bar: 30 μm) with the inset showing its elliptical meta-atom array (scale bar: 5 μm). b Non-polarized Fourier-transform infrared spectroscopy (FTIR) spectra of the P-QBIC and LSP modes. c Non-polarized FDTD spectra of the P-QBIC and LSP modes. d Simulated emissivity mapping of wavelength and polar angle \({\theta }_{x}\) with its inserting lines in (e) showing the angular distribution with fixed wavelengths \(\lambda=3.36\,{{\upmu }}{{{\rm{m}}}}\) and \(3.43\,{{\upmu }}{{{\rm{m}}}}\), and the spectral distribution with fixed \({\theta }_{x}=0^\circ\) and \(45^\circ\). f Simulated emissivity mapping in direction cosines \(\left({u}_{x},{u}_{y}\right)\) for the resonant wavelengths λ = 3.36 μm of the P-QBIC mode and λ = 3.87 μm of the LSP mode in (c), respectively.
