Fig. 4: EQE for different grating spacings.
From: Photon-trapping-enhanced avalanche photodiodes for mid-infrared applications

Measured EQE of the photon-trapping SACM APD versus grating spacing.
From: Photon-trapping-enhanced avalanche photodiodes for mid-infrared applications

Measured EQE of the photon-trapping SACM APD versus grating spacing.