1,721,002 research outputs found
Sub-wavelength annular-slit-assisted superoscillatory lens for longitudinally-polarized super-resolution focusing
No full textA binary metallic superoscillatory lens assisted with annular subwavelength slits is proposed, which generates a longitudinally-polarized super-resolution focal point. The annular slits are designed to selectively transmit radially-polarized light. Simulations using the finite element method show a 0.24 λ focal spot with 21.8 dB of polarization purity and only 0.342 dB reduction in efficiency compared to a standard superoscillatory lens
A superoscillatory metalens array
No full textA planar array of lenses made from spatially varying plasmonic meta-atoms generates multiple sub-wavelength focal spots in the post evanescent region
Optically reconfigurable dielectric metamaterials
No full textWe demonstrate femtosecond-laser-induced raster writing and erasing of dielectric metamaterial patterns using the phase-change mechanism in chalcogenide films. The technology is demonstrated by creating dynamically refocusable and chromatically correctable lenses and diffraction gratings
Exploring the limits of super oscillatory imaging
No full textAn investigation of the resolution limits of super-oscillatory imaging shows that, for objects of limited size, resolution of lambda/14 can be obtained in the far-field without the use of evanescent waves or fluorescence
Image processing using coherent absorption
No full textWe demonstrate logical operations with two images using coherent interaction of optical beams on thin films and metasurfaces. The new coherent image processing is illustrated by mode selection and deletion for spatial mode multiplexing
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