Fig. 1. Antenna model and structure parameter. (a) Top view of antenna; (b) front view of antenna; (c) schematic diagram of simulation; (d) 3D model of antenna

Fig. 2. Influence of antenna parameters on infrared enhancement characteristics of antenna. (a), (b), (c), (d) are fitting curves ofE/E0 at resonant condition and resonant wavelength with different l, w₂,_{w1, and d, respectively}

Fig. 3. Influence of incident light on infrared enhancement characteristics of antenna

Fig. 4. Model of double-layer antenna. (a) 3D structure diagram; (b) section structure diagram

Fig. 5. Fitting curves of E/E0 at resonant condition and resonant wavelength with different h

Fig. 6. Variation of E/E0with incident wavelength in different rotation angles of lower antenna

Fig. 7. Definition of coupling and interference enhancement with double-layer optical antenna structure. (a) Curve of E/E0 in different h at same point with/without upper antenna; (b) projection of surface field intensity ratio difference ∆E on XZ plane