Non-reciprocal devices are essential in many field that require unidirectional wave transmission, such as communications, sensor technology and quantum computing. However, most existing devices are constrained by factors including power supply, external magnetic field, efficiency, and bandwidth. We demonstrated an all-passive, broadband and high efficient nonreciprocal metasurface based on vanadium dioxide (VO2). The electromagnetic thermal coupling simulation results show that when the incident light power density is 40-55 kW/cm2, the transmittance is 90% in one direction and nearly 20% in the other direction. Moreover, benefiting from the non-resonant structure of the metasurface, the device can be used at a broadband wavelength of 7-12 μm. Thus, the demonstrated device has the advantages of broadband and high efficiency, offering a simple but effective scheme of all-passive unidirectional devices.
In recent years, the super-oscillatory lens based on optical super-oscillatory phenomenon has been successfully applied to sub-diffraction focusing and imaging. However, most of the previously reported super-oscillatory lens only work in the visible and near-infrared wavelengths, and little research has been done in the ultraviolet. In this paper, a polarization-insensitive ultraviolet super-oscillatory metalens doublet is proposed. The simulation results show that sub-diffraction focusing and imaging with different incidence angles can be achieved at the ultraviolet operating wavelength of 365nm, and the full width at half maximum of the sub-diffraction foci is approximately 0.7 times of the diffraction limit. This metalens doublet has a numerical aperture of 0.4472, a focal length of 0.6896 mm, and a field of view of ±25°. The proposed polarization-insensitive ultraviolet super-oscillatory metalens doublet can be used in the fields of ultraviolet lithography and microscopic imaging.
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