Pengfei Wang, Fengyan He, Jianjun Liu, Fangzhou Shu, Bin Fang, Tingting Lang, Xufeng Jing, Zhi Hong. Ultra-high-Q resonances in terahertz all-silicon metasurfaces based on bound states in the continuum[J]. Photonics Research, 2022, 10(12): 2743
- Photonics Research
- Vol. 10, Issue 12, 2743 (2022)
Fig. 1. (a) Schematic diagram of a high-Q all-silicon terahertz metasurface consisting of periodic air-porous tetramers. The periods of the unit cell are Λ x = Λ y = Λ = 300 μm r 1 = 35 μm r 2 = 55 μm
Fig. 2. (a) Calculated transmissions of metasurfaces with different r 1 r 2 = 55 μm f 1 f 2 f 3 Q factors of f 1 f 2 r 1 Ez ) or magnetic field (Hz ) of resonance f 1 f 2 f 3 r 1 = 45 μm
Fig. 3. Dispersion relations of (a) TE modes and (b) TM modes as a function of k ( Λ / π ) r 1 = r 2 = 55 μm Ez ) or magnetic fields (Hz ) in the x − y Γ = 0
Fig. 4. (a) Calculated transmissions of the metasurface in ipsilateral configuration with different r 1 r 2 = 55 μm Ez ) or magnetic field (Hz ) of resonance f 1 f 2 r 1 = 45 μm Q factors of f 1 f 2 r 1
Fig. 5. (a), (b) Calculated and measured transmissions of three diagonal configuration metasurfaces with circular truncated cone air holes, loss tangent of 0.0001 is considered in calculations. (c) Three enlarged views of measured and Fano fitted resonance f 2
Fig. 6. (a) Transmissions of a high-Q metasurface (r 1 = 25 μm f 2
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