Fig. 1. (Color online) The thickness of antenna layer, dielectric spacer (PMMA) and Ag backplane are 40, 160, and 100 nm, respectively. The dimensions of the chiral-molecules are L₁, L₂, W₁, W₂, P, H, G, and 105, 230, 85, 115, 470, 40, 120 nm, respectively. (a) Schematic illustration of a device with an interdigital structure composed of left-handed (LH) chiral metamaterials and stripe antenna in device 1. (b) An interdigital structure composed of stripe antennas and right-handed (RH) chiral metamaterials in device 2. (c) An interdigital structure composed of left-handed (LH) chiral metamaterials and right-handed (RH) chiral metamaterials in device 3. (d) Band diagram of the device, of which photocurrent generated in five consecutive steps. A Schottky barrier formed by Si and Ti.

Fig. 2. (Color online) (a) Cross-section of the k-space distribution of the Ag-Si interface. (b) Emission probability of a hot carrier with reflecting events.

Fig. 3. (Color online) (a, b) Absorption spectra of LH chiral metamaterials and collection electrodes for LCP light and RCP light, respectively. (c, d) Simulation of the electric field intensity for LCP and RCP light at a wavelength of 1330 nm, respectively.

Fig. 4. (Color online) (a, b) Optical absorption spectra of RH chiral metamaterials and collection electrodes under LCP light and RCP light illumination, respectively. (c, d) Simulation of the electric field intensity for LCP and RCP light at a wavelength of 1330 nm, respectively.

Fig. 5. (Color online) (a, b) Optical absorption spectra of LH and RH chiral metamaterials under LCP light and RCP light illumination, respectively. (c, d) Simulation of the electric field intensity for LCP light and RCP light illumination at a wavelength of 1330 nm, respectively.

Fig. 6. (Color online) (a) Emission probability and internal quantum efficiency of hot electrons as functions of the photon wavelength. (b) Responsivities with different current directions obtained from the interdigital structure of LH and RH metamaterials.