1
|
Liu H, Yuan L. Controlling the spin Hall effect of grafted vortex beams propagating in uniaxial crystal. OPTICS EXPRESS 2023; 31:10434-10448. [PMID: 37157590 DOI: 10.1364/oe.485247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Though numerous studies of spin-orbit interaction (SOI) of light beams propagating along the optic axis of uniaxial crystals have been carried out, in previous studies, the initial input beams have cylindrical symmetry. In this case, the total system preserves cylindrical symmetry so that the output light after passing through the uniaxial crystal doesn't exhibit spin dependent symmetry breaking. Therefore, no spin Hall effect (SHE) occurs. In this paper, we investigate the SOI of a kind of novel structured light beam, grafted vortex beam (GVB) in uniaxial crystal. The cylindrical symmetry of the system is broken by the spatial phase structure of the GVB. As a result, a SHE determined by the spatial phase structure emerges. It is found that the SHE and evolution of the local angular momentum are controllable both by changing the grafted topological charge of the GVB and by employing linear electro-optic effect of the uniaxial crystal. This can open a new perspective to investigate the SHE of light beams in uniaxial crystals via constructing and manipulating the spatial structure of the input beams artificially, hence offers novel regulation capabilities of spin photon.
Collapse
|
2
|
An XQ, Song HS, Zeng XY, Gu MN, Jiang ZS, He CW, Liu GY, Cheng CF, Zhang YQ. Arbitrary superposition of plasmonic orbital angular momentum states with nanostructures. OPTICS LETTERS 2022; 47:2032-2035. [PMID: 35427329 DOI: 10.1364/ol.451162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 03/09/2022] [Indexed: 06/14/2023]
Abstract
A kind of plasmonic nanostructure is proposed that can generate the arbitrary superposition of orbital angular momentum (OAM) states in surface plasmons (SPs), which is achieved by combining the segmented spirals with nanoslit pairs. The structures can independently modulate both the phase and amplitude of SP waves, and thus enable the superposition of two OAM states with arbitrary topological charges (TCs) as well as free control of their relative amplitudes. Superposed states distributed over the entire Bloch sphere and hybrid superposed states with different TCs were constructed and experimentally demonstrated. This work will offer more opportunities for multifunctional plasmonic devices.
Collapse
|
3
|
Liu H, Deng S, Deng H, Xu R, Yang H, Teng C, Zhang L, Chen M, Yuan L. Spin-orbital coupling of quadratic-power-exponent-phase vortex beam propagating in a uniaxial crystal. OPTICS EXPRESS 2020; 28:216-225. [PMID: 32118952 DOI: 10.1364/oe.377420] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 12/12/2019] [Indexed: 06/10/2023]
Abstract
Recent studies have shown that quadratic-power-exponent-phase (QPEP) vortex and modified QPEP vortex have some novel properties and potential applications in optical manipulation, orbital angular momentum (OAM) communication, OAM multicasting and so on. In these applications, there may be potential need of processing these kinds of beams by using uniaxial crystals. In this paper, the analytical propagation equations of Gaussian QPEP vortex and modified QPEP vortex propagating in uniaxial crystals are derived and the evolution of the angular momentum via spin-orbital coupling during the propagation is investigated. This may be meaningful for guiding and promoting the applications of the QPEP vortex and modified QPEP vortex.
Collapse
|
4
|
Liu H, Deng H, Deng S, Teng C, Chen M, Yuan L. Vortex Beam Encoded All-Optical Logic Gates Based on Nano-Ring Plasmonic Antennas. NANOMATERIALS 2019; 9:nano9121649. [PMID: 31757019 PMCID: PMC6955695 DOI: 10.3390/nano9121649] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 11/12/2019] [Accepted: 11/16/2019] [Indexed: 11/16/2022]
Abstract
Vortex beam encoded all-optical logic gates are suggested to be very important in future information processing. However, within current logic devices, only a few are encoded by using vortex beams and, in these devices, some space optical elements with big footprints (mirror, dove prism and pentaprism) are indispensable components, which is not conducive to device integration. In this paper, an integrated vortex beam encoded all-optical logic gate based on a nano-ring plasmonic antenna is proposed. In our scheme, by defining the two circular polarization states of the input vortex beams as the input logic states and the normalized intensity of the plasmonic field at the center of the nano-ring as the output logic states, OR and AND (NOR and NAND) logic gates are realized when two 1st (1st) order vortex beams are chosen as the two input signals; and a NOT logic gate is obtained when one 1st order vortex beam is chosen as the input signal. In addition, by defining the two linear polarization states (x and y polarization) of the input vortex beams as the two input logic states, an XNOR logic gate is realized when two 1st order vortex beams are chosen as the two input signals.
Collapse
Affiliation(s)
- Houquan Liu
- Photonics Research Center, School of Electronic Engineering and Automation, Guilin University of Electronics Technology, Guilin 541004, China; (S.D.); (C.T.); (M.C.); (L.Y.)
- Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronics Technology, Guilin 541004, China
- Correspondence: (H.L.); (H.D.)
| | - Hongchang Deng
- Photonics Research Center, School of Electronic Engineering and Automation, Guilin University of Electronics Technology, Guilin 541004, China; (S.D.); (C.T.); (M.C.); (L.Y.)
- Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronics Technology, Guilin 541004, China
- Correspondence: (H.L.); (H.D.)
| | - Shijie Deng
- Photonics Research Center, School of Electronic Engineering and Automation, Guilin University of Electronics Technology, Guilin 541004, China; (S.D.); (C.T.); (M.C.); (L.Y.)
- Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronics Technology, Guilin 541004, China
| | - Chuanxin Teng
- Photonics Research Center, School of Electronic Engineering and Automation, Guilin University of Electronics Technology, Guilin 541004, China; (S.D.); (C.T.); (M.C.); (L.Y.)
- Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronics Technology, Guilin 541004, China
| | - Ming Chen
- Photonics Research Center, School of Electronic Engineering and Automation, Guilin University of Electronics Technology, Guilin 541004, China; (S.D.); (C.T.); (M.C.); (L.Y.)
- Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronics Technology, Guilin 541004, China
| | - Libo Yuan
- Photonics Research Center, School of Electronic Engineering and Automation, Guilin University of Electronics Technology, Guilin 541004, China; (S.D.); (C.T.); (M.C.); (L.Y.)
- Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronics Technology, Guilin 541004, China
| |
Collapse
|
5
|
Chen M, Gao W, Liu H, Teng C, Deng S, Deng H, Yuan L. Polarization controllable generation of flat superimposed OAM states based on metasurface. OPTICS EXPRESS 2019; 27:20133-20144. [PMID: 31510113 DOI: 10.1364/oe.27.020133] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 07/02/2019] [Indexed: 06/10/2023]
Abstract
In this paper, two kind of metasurface-based flat orbital angular momentum (OAM) superposition-state generators are proposed, which can generate OAM superposition states possessing tens of OAM modes being evenly spaced by topological charge number 1. The power spectra of the generated OAM superposition states are flat. The power variation of the OAM modes of the OAM superposition states from one generator is less than 3 dB, and the power variation of the OAM modes of the OAM superposition states from the other one is less than 0.3 dB. By controlling the left-handed and right-handed circular polarization states of the incident light, the OAM spectra of the OAM superposition states generated in the two polarization cases are separated from each other, therefore, the proposed generators are light polarization controllable. In addition, the two generators can operate efficiently on a wide wavelength region ranging from 635nm to 730nm. Our work may have some potential applications, such as used for OAM multicasting, OAM based optical manipulation, or manufacturing integrated OAM-superposition-state generators and OAM modulation devices.
Collapse
|