Observation of the in-plane spin separation of light

Qin, Yi; Li, Yudong; Feng, Xiaobo; Xiao, Yun‐Feng; Yang, Hong; Gong, Qihuang

doi:10.1364/oe.19.009636

Cited by 94 publications

(69 citation statements)

References 21 publications

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“…First, we analyze the in-plane one. In the past work, the in-plane spin-dependent splitting can not be observed in the case of horizontal polarization or vertical polarization [25]. However, in present research, this effect surprisingly happens in these two polarized states.…”

Section: Resultscontrasting

confidence: 65%

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Photonic spin Hall effect in topological insulators

et al. 2013

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In this paper we theoretically investigate the photonic spin Hall effect (SHE) of a Gaussian beam reflected from the interface between air and topological insulators (TIs). The photonic SHE is attributed to spin-orbit coupling and manifests itself as in-plane and transverse spin-dependent splitting. We reveal that the spin-orbit coupling effect in TIs can be routed by adjusting the axion angle variations. Unlike the transverse spin-dependent splitting, we find that the in-plane one is sensitive to the axion angle. It is shown that the polarization structure in magneto-optical Kerr effect is significantly altered due to the spin-dependent splitting in photonic SHE. We theoretically propose a weak measurement method to determine the strength of axion coupling by probing the in-plane splitting of photonic SHE.

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Section: Resultscontrasting

confidence: 65%

“…We note that the correction proportional to wave vector component k ix ignored by the previous work is responsible for the in-plane spin-dependent splitting [25]. The photonic SHE is described for the left-and rightcircularly polarized components undergoing the in-plane and transverse shifts.…”

Section: Theoretical Analysismentioning

confidence: 88%

Photonic spin Hall effect in topological insulators

et al. 2013

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“…Thus, k x and k y are the in-plane (incidence plane) and out-of-plane wave vectors, respectively. The k x -dependent RVB phase is responsible for the in-plane spin separation, 35,36 whereas the k y -dependent RVB phase will result in a spin-dependent shift perpendicular to the incidence plane, i.e., the SHE of the light. 18,19,22 Here, we are interested only in the SHE, that is, we consider W G to be dependent only on k y .…”

Section: Methodsmentioning

confidence: 99%

Giant photonic spin Hall effect in momentum space in a structured metamaterial with spatially varying birefringence

et al. 2015

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The photonic spin Hall effect (SHE) in the reflection and refraction at an interface is very weak because of the weak spin-orbit interaction. Here, we report the observation of a giant photonic SHE in a dielectric-based metamaterial. The metamaterial is structured to create a coordinate-dependent, geometric Pancharatnam-Berry phase that results in an SHE with a spin-dependent splitting in momentum space. It is unlike the SHE that occurs in real space in the reflection and refraction at an interface, which results from the momentum-dependent gradient of the geometric Rytov-Vladimirskii-Berry phase. We theorize a unified description of the photonic SHE based on the two types of geometric phase gradient, and we experimentally measure the giant spin-dependent shift of the beam centroid produced by the metamaterial at a visible wavelength. Our results suggest that the structured metamaterial offers a potential method of manipulating spin-polarized photons and the orbital angular momentum of light and thus enables applications in spin-controlled nanophotonics. Keywords: geometric phase; metamaterial; photonic spin Hall effect INTRODUCTION Metamaterials or metasurfaces are artificial materials that are engineered to produce nearly any imaginable optical properties that are not found in nature. 1,2 They are typically structured at the subwavelength scale with ultrathin metallic or dielectric micro/nanoparticles or with holes opened in metallic films. Metamaterials exhibit unprecedented degrees of freedom in the polarization and phase manipulation of light via the geometric structuring of their structural units, especially on the wavelength scale, 3-9 which leads to applications such as vortex beam generators, 3,7 metalenses 10,11 and optical holography. 12,13 These materials also offer considerable potential for the manipulation of the angular moment of light and the photonic spin Hall effect (SHE), thereby providing convenient opportunities for spin-polarized photonics and nanophotonics. [14][15][16][17] The photonic SHE describes the mutual influence of the photon spin (polarization) and the trajectory (orbital angular momentum) of light-beam propagation, i.e., the spin-orbit interaction (SOI), which results in two types of geometric phases: the Rytov-VladimirskiiBerry (RVB) phase and the Pancharatnam-Berry (PB) phase. [18][19][20][21][22] The RVB phase is associated with the evolution of the propagation direction of light. When a light beam reflects/refracts at a planar interface between different media, a SOI occurs, and the corresponding momentum-dependent RVB phase leads to a spin-dependent real-

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“…In principle, this weak measurement technique employs two appropriate pre-and post-selection states to achieve an enhancement shift. In considerable amount of measurements, the pre-and postselection processes are implemented by using two nearly crossed Glan-Taylor polarizers (GTPs) [5][6][7][9][10][11][12], of which we can choose the optimal pre-and post-selection to acquire the maximum weak value [17]. Nevertheless, Kong et al present an effective solution consisting of two polarizers with an angle of 45 • to measure the SHEL around the Brewster angle [18,19].…”

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confidence: 99%

Optimized weak measurement for spatial spin-dependent shifts at Brewster angle

Zhang

Liu

et al. 2016

Appl. Phys. B

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presented as the Goos-Hänchen (GH) shift [1]. The out-ofplane one is also well known as Imbert-Fedorov (IF) shift [2], which performs as the out-of-plane spin-dependent shift (SDS) of the barycenter of circularly polarized beam. Based on the IF shift, an intriguing dynamic behavior, the separation of right-handed (RH) and left-handed (LH) circularly polarized components of the incident beam, can be observed for a linearly polarized beam with bounded width [3,4]. This phenomenon can be considered as a photonic analog of the electric spin Hall effect occurring in solidstate systems, generally named spin Hall effect of light (SHEL) [5,6]. Furthermore, these two kinds of shifts can be presented in spatial and angular domains (see, e.g., [7] and the references therein for a review).More generally, the magnitude of the SDSs is only on the nanoscale and is hard to achieve accurate measurement. In 2008, Hosten et al. firstly introduced the weak measurement technique to precisely characterize the tiny out-of-plane SDS associated with SHEL [5,8]. This unique method allows significant magnification of beam shifts and paves a useful way to observe this SDS and GH shift in optical reflection [9-15] and identify the polarization chirality of light beam [16]. In principle, this weak measurement technique employs two appropriate pre-and post-selection states to achieve an enhancement shift. In considerable amount of measurements, the pre-and postselection processes are implemented by using two nearly crossed Glan-Taylor polarizers (GTPs) [5][6][7][9][10][11][12], of which we can choose the optimal pre-and post-selection to acquire the maximum weak value [17]. Nevertheless, Kong et al. present an effective solution consisting of two polarizers with an angle of 45 • to measure the SHEL around the Brewster angle [18,19]. In the past few years, it has aroused considerable amount of investigations to manipulate the magnitude and direction of spin splitting [19][20][21][22][23][24] Abstract As Brewster law goes, the polarization selectivity when a light beam reflected at Brewster angle is feasible. We find that this polarization selectivity is still effective incorporated with weak measurement. So we realize an optimized weak measurement technique without preselection polarizer. This scheme is exploited to observe the spatial spin-dependent shifts when a linearly polarized beam is reflected at Brewster angle. The theoretical and experimental results show that by changing the polarization orientation of incident beam, the in-plane spin-dependent shift direction can be reversed, while the out-of-plane spindependent shift direction keeps unchanged. Our results may enrich the application of weak measurement.

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Observation of the in-plane spin separation of light

Cited by 94 publications

References 21 publications

Photonic spin Hall effect in topological insulators

Photonic spin Hall effect in topological insulators

Giant photonic spin Hall effect in momentum space in a structured metamaterial with spatially varying birefringence

Optimized weak measurement for spatial spin-dependent shifts at Brewster angle

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