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Edge detection by spiral phase contrast imaging at terahertz frequencies
2021
Electronics Letters
This paper proposes the spiral phase contrast (SPC) imaging at terahertz (THz) frequencies to achieve the target edge detection. The THz SPC imaging is built based on a classical 4f imaging system, and a spiral phase plate is placed in the Fourier plane to generate the spiral phase. Owing to the unique nature of the spiral phase, edge detection can be achieved. The THz SPC imaging mechanism is analysed by the scalar diffraction theory, and its corresponding analytic expression is derived. A
doi:10.1049/ell2.12167
fatcat:pniyor5xefbr5i4javpwvapefe