Abstract
We present here a compact metasurface lens element that enables simultaneous and spatially separated imaging of light of opposite circular polarization states. The design overcomes a limitation of previous chiral lenses reliant on the traditional geometric phase approach by allowing for independent focusing of both circular polarizations without a 50% efficiency trade-off. We demonstrate circular polarization-dependent imaging at visible wavelengths with polarization contrast greater than 20dB and efficiencies as high as 70%.
Highlights
Polarization, a fundamental characteristic of electromagnetic radiation, is manifest in almost all optical phenomena, from reflection and transmission at an interface, scattering by small particles, and the physics of atomic transitions[1]
Metasurfaces and diffractive optics utilizing the so-called geometric phase have emerged as novel optical elements for addressing circular polarization states[18,19,20]
Any desired phase profile may be imparted on one circular polarization state; since the phase shifts are always equal and opposite, only one of the circular polarization states may be independently controlled with such a scheme
Summary
→− and λ (λ1−, λ2−) is given by[25]:. In the case of metasurfaces, a birefringent phase shifting element implementing J must be found. F denotes the desired focal length, θ denotes the off-axis angle of the lens, λ0 is the design (free-space) wavelength, and x and y are Cartesian spatial coordinates of the lens The LCP - RCP focusing efficiency, ILCP − IRCP, which is defined as the ratio of the intensity in the respective focal spot over the incident intensity across the aperture of the meta-lens, was measured for various QWP angles. Light incident on the chiral meta-lens is linearly polarized with vertical orientation and focused as two beams of opposite CP and equal intensity.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
