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(a) Broadband absorption of an absorber with 0.8 eV Fermi energy levels and insulator VO2 states, dual-band absorption with 0.8 eV Fermi energy and metallic VO2 state, and single-band absorption with 0 eV and metallic absorption (TE and TM polarization). (b) Absorption with the Fermi energy level 0 eV and VO2 insulator state (TE and TM polarization).
