Depolarization of a randomly distributed plasmonic meander metasurface characterized by Mueller matrix spectroscopic ellipsometry

Fu, Liwei; Berrier, Audrey; Li, Huiyu; Schau, Philipp; Frenner, Karsten; Dressel, Martin

doi:10.1364/oe.24.028056

Cited by 8 publications

(9 citation statements)

References 27 publications

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“…It is worth noting that, in recent years, the LC has been perfectly combined with a metasurface to achieve many tunable two-dimensional devices with great potential for application [ 17 , 18 , 19 , 20 ]. Predecessors have tried to implement depolarizers in the field of surface plasmons, but the inherent properties of the metal material itself limit the efficiency of the devices [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Electronically Controlled Time-Domain Integral Average Depolarizer Based on a Barium Titanate (BTO) Metasurface

et al. 2022

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A depolarizer, a kind of optical element that converts polarized light to unpolarized light, has been found massive applications in classical optics. However, depolarizers based on metasurface which can be applied in integrated optics have rarely been proposed. In this paper, an electronically controlled metasurface depolarizer is demonstrated based on the time-domain integral average method and nano-material barium titanate. It obtains emergent light with a degree of polarization reduced to 2.5% when hit by linearly polarized light at 633 nm, and has a transmission efficiency greater than 72%. This depolarizing metasurface can be designed on-demand, immunizing the degree of the emergent light from its size, and has the simple electronic control with high-speed response.

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Section: Introductionmentioning

confidence: 99%

Electronically Controlled Time-Domain Integral Average Depolarizer Based on a Barium Titanate (BTO) Metasurface

et al. 2022

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“…These artificial structures introduce abrupt phase changes with the orientations or * lihuiyu@bistu.edu.cn geometrics of the structures [9][10][11][12][13][14]. In the meanwhile, the metalens could be used for conversion of the polarization state and phase distribution simultaneously [15].…”

Section: Introductionmentioning

confidence: 99%

The design of a beam shaping lens with flat surfaces and ultra-thin thickness to convert a Gaussian beam to a top-hat beam

Wang

Chen

2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

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The beam shaping system to convert the Gaussian beam to top-hat beam is widely used in modem optics such as laser technologies. A general beam shaper is normally composed of a convex or concave lens in nonspherical or freeform, which is bulky in the optical path and turns to a barrier in size minorizing for a compact system. A novel beam shaper with a plane structure with flat surfaces on both bottom and top sides are provided in this paper. Taking advantages of the phase changes by the subwavelength structures and the general Fresnel principle for discrete structures, a metalens with beam shaping function is designed. The phase variation between a Gaussian beam and a top-hat beam is studied with Fourier optics and then is adopted to the layout of the beam shaping metalens. Afterwards, the finite domain time difference method is adopted to simulate the energy distribution of the modulated beam to study the effectiveness of the novel ultra-thin beam shaping metalens. Examples to convert the Gaussian beam to top-hat beam calculated with convex surface and nanopillar array with flat surfaces are illustrated in the paper to demonstrate and discuss the beam shaping results with the novel design in plane form and ultra-thin thickness. According to our study, a beam shaping lens with flat surfaces and thickness smaller than 1 um with the uniformity better than 98% can be achieved at wavelength of 790 nm. Variable beam shaping results could be obtained by the design method to figure out the phase distribution with ray optics and then design the metalens according to the desired phase modulation by arranging the subwavelength structures accordingly. Tue numerical results may pave the way for further design of metalens and offers a solution for compact systems with optical paths.

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“…Therefore, MM provides a complete description of the optical response of a medium to excitation and becomes a powerful and sensitive tool to fully characterize the anisotropic and depolarizing samples. Until now, MM spectroscopic ellipsometry has been applied in different fields such as, for example, metrology [10,11], plasmonic nanomaterials [12][13][14][15][16][17], and magnetic or biological materials [18,19]. The challenge of the physical interpretation of a measured MM is consequently of growing importance.…”

Section: Introductionmentioning

confidence: 99%

Effective medium approximation based interpretation for Mueller matrix spectra of polydimethylsiloxane gratings

Wang¹,

Liu²,

Jiang³

et al. 2021

J. Opt.

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Dielectric corrugated gratings are of considerable interest due to their applications in acousto-optics, quantum electronics, integrated optics, spectroscopy, and holography integrated optics. Rigorous coupled-wave analysis has been widely used for the analysis of dielectric gratings. However, this approach is not only time-consuming and computer intensive but it also does not really promote the physical understanding of the origin of the observed optical behavior. Here, we use Mueller matrix (MM) spectroscopic ellipsometry to systematically study the sinusoidal polydimethylsiloxane grating. We correlate the observed polarization mixing in the Mueller matrix to the underlying physical origin using the physics-based approach. The calculated MM contour plots obtained from a biaxial Bruggemann effective medium approximation model are completed by the presence of Rayleigh-Woods anomalies. The roles of optical interference, geometric anisotropy, and diffraction orders are respectively identified by their different dispersion behavior, with their interactions and couplings highlighted. Such a straightforward procedure provides a new method for analyzing dielectric gratings, which requires considerably less computer power and is directly linked to the physical interpretations.

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Depolarization of a randomly distributed plasmonic meander metasurface characterized by Mueller matrix spectroscopic ellipsometry

Cited by 8 publications

References 27 publications

Electronically Controlled Time-Domain Integral Average Depolarizer Based on a Barium Titanate (BTO) Metasurface

Electronically Controlled Time-Domain Integral Average Depolarizer Based on a Barium Titanate (BTO) Metasurface

The design of a beam shaping lens with flat surfaces and ultra-thin thickness to convert a Gaussian beam to a top-hat beam

Effective medium approximation based interpretation for Mueller matrix spectra of polydimethylsiloxane gratings

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