We propose and demonstrate a low-cost single-pixel terahertz imaging method based on near-field photomodulationand compressed sensing. By using monolayer graphene on a silicon substrate as the photomodulator,and a low-cost continuous-wave laser and digital micromirror device for effective patterned photomodulation, weachieve fast single-pixel terahertz imaging based on the compressed sensing algorithm. We further show thatadopting a graphene on silicon substrate leads to deeper modulation depth and thus better image quality thana high-resistance silicon substrate. We expect this work will advance the development of low-cost single-pixelterahertz imaging and promote this technique into practical applications.
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