Planar peristrophic multiplexing metasurfaces

Abstract

As a promising counterpart of two-dimensional metamaterials, metasurfaces enable to arbitrarily control the wavefront of light at subwavelength scale and hold promise for planar holography and applicable multiplexing devices. Nevertheless, the degrees of freedom (DoF) to orthogonally multiplex data have been almost exhausted. Compared with state-of-theart methods that extensively employ the orthogonal basis such as wavelength, polarization or orbital angular momentum, we propose an unprecedented method of peristrophic multiplexing by combining the spatial frequency orthogonality with the subwavelength detour phase principle. The orthogonal relationship between the spatial frequency of incident light and the locally shifted building blocks of metasurfaces can be regarded as an additional DoF. We experimentally demonstrate the viability of the multiplexed holograms. Moreover, this newly-explored orthogonality is compatible with conventional DoFs. Our findings will contribute to the development of multiplexing metasurfaces and provide a novel solution to nanophotonics, such as large-capacity chip-scale devices and highly integrated communication.

Alignment‐Free Angular Momentum Detection via Spin‐Independent Astigmatic Transformation

“…[23,24] However, these methods normally suffer from integration difficulties owing to the adoption of bulky optical components, and cannot detect SAM and OAM simultaneously. Recently, the manipulation of optical fields based on subwavelength structures has gained increasing attention, [25][26][27][28][29][30] which has been widely utilized for optical vortices detection. [31][32][33][34][35][36][37] Specifically, the asymmetric spin-orbit interactions (SOIs) based on the composite phase provide an effective design route for the simultaneous detection of SAM and OAM.…”

“…Recently, the manipulation of optical fields based on subwavelength structures has gained increasing attention, [ 25–30 ] which has been widely utilized for optical vortices detection. [ 31–37 ] Specifically, the asymmetric spin‐orbit interactions (SOIs) based on the composite phase provide an effective design route for the simultaneous detection of SAM and OAM.…”

Two-dimensional grating metasurface for communication band under Littrow mounting

“…With the advent of the intelligent era in the internet of things, information interaction between devices has become increasingly frequent. Traditional optical communication networks confront enormous challenges, requiring an urgent renewal of the network infrastructure [1][2][3][4]. As one of the essential optical components, grating devices [5,6] are widely used in integrated optical communication systems [7,8] because of their compact structure, simple preparation process and convenience of integration.…”

Bifocal-polarization holographic lens made from volume hologram

“…This unusual feature is widely used in polarization imaging [1][2][3][4] , microscopic amplification imaging [5,6] , stereo imaging [7][8][9][10] , projector [11] , etc., and may play an important role in the layered recording and reading of holographic discs [12][13][14] . In recent years, some bifocal polarization lens made of metasurface structures have been reported [15][16][17][18][19][20] . The principle is that the required phase delay can be flexibly designed by changing the geometric parameters or rotation angle of the component units of the metasurface lens, and different phase delays can be designed for polarized wave of different polarization states to generate different focal lengths.…”