Generation of terahertz vector beams using dielectric metasurfaces via spin-decoupled phase control

Xu, Yuehong; Zhang, Huifang; Li, Quan; Zhang, Xueqian; Xu, Quan; Zhang, Wentao; Hu, Cong; Zhang, Xixiang; Han, Jiaguang; Zhang, Weili

doi:10.1515/nanoph-2020-0112

Cited by 99 publications

(63 citation statements)

References 56 publications

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“…In this paper, we study reflective metasurfaces as an example to illustrate our key idea and extensions to the transmissive case are straightforward. To realize such spin-delinked dual functionalities, our meta-atoms should exhibit both spin-dependent geometric phases and spin-independent resonant phases, as already pointed out in recent literature [33,35,39,46,51,52]. Moreover, to generate a predesigned polarization distribution in the VOF, our meta-atoms should further possess desired local polarization-control capabilities, corresponding to certain paths on Poincare's sphere (see Figure 1a).…”

Section: Results and Discussion 21 Basic Conceptmentioning

confidence: 91%

“…First of all, metadevices so far proposed can usually generate only one particular VOF [18,30,31,38,[40][41][42], while multifunctional VOF generators are highly desired in future applications. Secondly, most reported metadevices can only generate VOFs with restricted polarization distributions (e.g., standard cylindrical polarization distributions [18,31,39,[44][45][46]), while VOFs with arbitrary polarization distributions are rarely seen. The inherent physics behind such issues are that previous approaches only utilized a single mechanism (either resonance or geometric mechanism) to design meta-atoms in constructing metadevices and only explored certain polarization-control capabilities of the constitutional meta-atoms [28-32, 38, 45-49].…”

Section: Introductionmentioning

confidence: 99%

“…The inherent physics behind such issues are that previous approaches only utilized a single mechanism (either resonance or geometric mechanism) to design meta-atoms in constructing metadevices and only explored certain polarization-control capabilities of the constitutional meta-atoms [28-32, 38, 45-49]. Although some sporadic works have reported the VOF generations employing multiple mechanisms [46,50], few of those designs was demonstrated experimentally in optical regime.…”

Section: Introductionmentioning

confidence: 99%

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High-efficiency metadevices for bifunctional generations of vectorial optical fields

et al. 2020

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Vectorial optical fields (VOFs) exhibiting tailored wave fronts and spatially inhomogeneous polarization distributions are particularly useful in photonic applications. However, devices to generate them, made by natural materials or recently proposed metasurfaces, are either bulky in size or less efficient, or exhibit restricted performances. Here, we propose a general approach to design metadevices that can efficiently generate two distinct VOFs under illuminations of circularly polarized lights with different helicity. After illustrating our scheme via both Jones matrix analyses and analytical model calculations, we experimentally demonstrate two metadevices in the near-infrared regime, which can generate vortex beams carrying different orbital angular momenta yet with distinct inhomogeneous polarization distributions. Our results provide an ultracompact platform for bifunctional generations of VOFs, which may stimulate future works on VOF-related applications in integration photonics.

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Section: Results and Discussion 21 Basic Conceptmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-efficiency metadevices for bifunctional generations of vectorial optical fields

et al. 2020

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“…[23,24] Metasurfaces have been widely used in many applications, such as lenses, [25,26] spin Hall effect, [27] holograms, [28] and vortex generators. [29][30][31][32][33] In order to further Vortex beams, carrying orbital angular momentum (OAM), have plenty of applications ranging from particle manipulation to high-capacity data transmissions. In particular, the superpositions of OAM patterns are significant in classical physics and quantum science.…”

mentioning

confidence: 99%

All‐Dielectric Metasurface for Manipulating the Superpositions of Orbital Angular Momentum via Spin‐Decoupling

Zheng

Wang

et al. 2021

Advanced Optical Materials

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Vortex beam has attracted much attention for carrying orbital angular momentum (OAM). It has a helical phase structure described by exp (ilθ) and an annular intensity distribution, where l is the topological charge corresponding to the OAM of each photon, and θ is the azimuth angle. [1] Vortex beam is widely used in OAM communications, [2,3] optical tweezers, [4] and quantum information coding. [5,6] In particular, the superposition of OAM states is very significant in metrology, [7,8] quantum science, [6,9] and OAM communications. The superposition of high-order OAM modes can be used for ultra-sensitive angle measurement. [8] In Bose-Einstein condensate, multiple OAM states can also be used to generate arbitrary superpositions of atomic rotation states. [10] Vortex beam carrying OAM has shown promising prospects in increasing the data capacity of communication systems, because multiple orthogonal modes can be transmitted at the same frequency in a single communication channel simultaneously.As we all know, photons carry two different kinds of angular momentums, namely spin angular momentum (SAM) and OAM. [11] The SAM represents the polarization state of light, and the OAM is related to the spatial distribution of light. [1,12] Although mode conversion, [13] holograms, [14] spiral phase plates, [15] and spiral zone plates [16][17][18] can be used to generate vortex beam, they usually do not involve the interaction between SAM and OAM. [19] Different from the above, the geometric phase elements can establish a connection between SAM and OAM, but only two conjugate vortex states can be output. Devlin presented a method realizing arbitrary spin-to-OAM conversion, overcoming this limitation mentioned above. [20] In addition, when the paraxial beam is tightly focused, a strong longitudinal component will be generated in the focal area. [21] It is demonstrated that, in a highly focused system, a circularly polarized beam partly transfers its incident SAM to OAM and a helical phase in the longitudinal component of the electric field can be generated. [22] Due to their potential breakthroughs in optical manipulation, metasurfaces have attracted widespread attention in the scientific community. [23,24] Metasurfaces have been widely used in many applications, such as lenses, [25,26] spin Hall effect, [27] holograms, [28] and vortex generators. [29][30][31][32][33] In order to further Vortex beams, carrying orbital angular momentum (OAM), have plenty of applications ranging from particle manipulation to high-capacity data transmissions. In particular, the superpositions of OAM patterns are significant in classical physics and quantum science. The flexible control of spin angular momentum (SAM) to OAM can provide more freedom for the design of multifunctional devices. Here, a kind of dielectric metasurface is proposed that generates polarization-controllable superpositions of OAM patterns in the terahertz (THz) band, which is achieved by the interleaving of anisotropic and isotropic meta-atoms. The conversions of arbitrary S...

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“…The research papers can be categorized as: (1) Plasmons (six): particle simulation of plasmons [7], plasmonic nanocavity [8], directional router [9], surface plasmon mode [10], Cherenkov radiation [11], and plasmonic stereo-metamolecule [12] (2) Transformation optics (two): [13,14] (3) Pancharatnam-Berry phase and optical angular momentum (five): [15][16][17][18][19] CMOS [28], metalens [29], hybrid metasurface [30], sensor [31], optical trapping [32], photodetector [33], asymmetric transmission [34], structural colors [35], and metagrating [36].…”

mentioning

confidence: 99%

Editorial on special issue “Metamaterials and Plasmonics in Asia”

Ishihara

Zhou

et al. 2020

Nanophotonics

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The special issue "Metamaterials and Plasmonics in Asia" was developed from the A3 Metamaterials Forum, an annual research meeting first established in 2016, but also includes other specially invited papers. Since the first published report on negative refractive index by Prof. Victor Veselago in the Soviet Union, the experimental demonstration of negative index materials in the microwave region by Dr. David Smith in the USA, and the high-resolution imaging application by Prof. John Pendry in the UK, research on metamaterials has exploded in different academic fields. In the early stages of metamaterials research, most of the research activity took place in the USA, the UK and Europe, whilst in Asia it was scarce and rather scattered. Although science is certainly not limited by national borders, it is important to hold regional meetingsespecially in Asiato create a more cohesive and collaborative environment on the continent, enabling young scientists to be easily introduced into the local Metamaterials and Plasmonics community and create a platform for collaborative research. During the Metamaterials 2010 Conference in Karlsruhe, Germany, the late Prof. Masanori Hangyo (Osaka University, Japan) and Prof. Jeong Weon Wu (Ewha Womans University, Korea) conceived the idea of a joint Korea-Japan organized Metamaterials Forum. This first Korea-Japan Metamaterials Forum was organised in Seoul, Korea. Sadly, Prof. Hangyo passed away in 2014, and Prof. Teruya Ishihara (Tohoku University) took over as Japanese co-chair at that point. In 2016, the Metamaterials Forum expanded geographically to include China, with Prof. Lei Zhou (Fudan University, China) as Chinese co-chair and the forum was renamed to "A3 Metamaterials Forum". This special issue holds a plethora of research topics in metamaterials and plasmonics and includes 30 original research articles and six review articles. Of these 36 articles, nineteen contributions originate from China (including one from Hong Kong SAR), six from Korea, five from Singapore, four from Japan, and two from Australia.

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Generation of terahertz vector beams using dielectric metasurfaces via spin-decoupled phase control

Cited by 99 publications

References 56 publications

High-efficiency metadevices for bifunctional generations of vectorial optical fields

High-efficiency metadevices for bifunctional generations of vectorial optical fields

All‐Dielectric Metasurface for Manipulating the Superpositions of Orbital Angular Momentum via Spin‐Decoupling

Editorial on special issue “Metamaterials and Plasmonics in Asia”

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