Fourier single-pixel imaging in the terahertz regime

We demonstrate Fourier single-pixel imaging in the terahertz regime. The experimental system is implemented using a photoinduced coded aperture setup, where monolayer graphene on a high-resistance silicon substrate illuminated by a coded laser beam works as a terahertz modulator. The results show that high-quality terahertz images can be reconstructed using a greatly reduced number of measurements. We further find that deep photoinduced terahertz modulation, by adding a monolayer graphene on the silicon substrate and by using high laser power, can significantly improve the image quality. Compared to Hadamard single-pixel imaging with a reordered Hadamard matrix, the Fourier approach has higher image quality. We expect that this work will speed up the efficiency of single-pixel terahertz imaging and advance terahertz imaging applications.