Dispersion-assisted high-dimensional photodetector

anisotropic photodetectors under different polarization and spectrum states. e, Ratio of the experimental k-space transmission mappings for the following scenarios: without/with our anisotropic sample of 0° (p) and 90° (s) LP at 532 nm wavelength, LCP and RCP at 400 nm wavelength, 525 nm wavelength and 400 nm wavelength under LCP. The transmission ratio mappings are all nearly uniform without our sample, while our photodetector’s ratio mappings have distinguishable features, demonstrating the polarization and spectrum sensitivity of our photodetector. 11 Experimental reconstruction of full-Stokes polarization, narrowband spectra, broadband complex spectrum, and spectral resolution As discussed in Fig. 3c-f of the main text, we experimental reconstruct the information of full-Stokes polarization states, narrowband spectra, a broadband complex spectrum, and the spectral resolution. In this session, the reconstruction processes are demonstrated in detail, with the basic Modified ResNet-18 model and the setup introduced in Methods (‘ResNet model and training details’). To reconstruct the full-Stokes polarization states (Fig. 3c), We acquire 195 k-space transmission mappings with varying power and polarization states by manipulating the polarizer, quarter-wave plate, and attenuation. To account for noise factors, the initial 195 mappings are expanded to form a dataset of 19500 mappings, gathered at 100 different times. Notably, 17500 (175×100) mappings constitute the training (80%) and validation (20%) sets, while the remaining 2000 (20×100) mappings serve as the test set, and the test set is not included in the training/validation set. The input layers consist of mapping matrices obtained from measurements taken at unknown polarization states specifically for a 532 nm wavelength, with the labels obtained from a commercial polarimeter (Thorlabs PAX1000VIS/M). For enhanced clarity and error analysis, we calculate the results shown in Fig. 3c on the S1-S2 plane (Fig. S15a) and S2-S3 plane (Fig.