Journal
OPTICS LETTERS
Volume 45, Issue 13, Pages 3506-3509Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.395580
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Funding
- Natural Science Foundation of Heilongjiang [LH2019F012]
- Engineering and Physical Sciences Research Council [EP/P029892/1]
- 111 project to Harbin Engineering University [B13015]
- China Scholarship Council [201808535073, 201906680066]
- EPSRC [EP/P029892/1] Funding Source: UKRI
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We propose a reflective terahertz (THz) metalens with four focal points for polarization detection of THz beams. The metalens is composed of Z-shaped resonators with spatially variant orientations, a reflective gold layer, and. a dielectric spacer between them. The polarization states of the focal points include left circular polarization, right circular polarization, an incident polarization state, and a polarization state whose major axis is rotated pi/4 in comparison with that of the incident polarization. The handedness, ellipticity, and major axis of the polarization state can be determined based on the light intensities of the focal points. The uniqueness of the designed device renders this technique very attractive for applications in compact THz polarization detection and information processing. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
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