Fig. 1. Structural diagram of T-shaped absorber

Fig. 2. Influences of parameters on absorption performance of T-shaped absorber. (a)W₁; (b) W₂; (c) L₂

Fig. 3. Absorption curve of T-shaped absorber

Fig. 4. Current distributions of T-shaped absorber. (a) Bottom current distribution; (b) top current distribution

Fig. 5. Resonance frequency of T-shaped absorber versus L1

Fig. 6. Structural diagram of polarization-insensitive T-shaped absorber

Fig. 7. Influences of polarization angle on absorption performance in different modes. (a) TE mode; (b) TM mode

Fig. 8. Absorptivity of polarization-insensitive T-shaped absorber

Fig. 9. Current distributions of polarization-insensitive T-shaped absorber in different modes. (a) Bottom current distribution in TE mode; (b) top current distribution in TE mode; (c) bottom current distribution in TM mode; (d) top current distribution in TM mode

Fig. 10. Resonant frequency of polarization-insensitive T-shaped absorber versus L1

Fig. 11. Structural diagram of frequency-adjustable T-shaped absorber

Fig. 12. Dynamically switchable absorption spectra of absorber pumped by lasers with different wavelengths