E‐Band Metasurface‐Based Orbital Angular Momentum Multiplexing and Demultiplexing

Chung, Hyeongju; Kim, Daeik; Choi, Eun‐Mi; Lee, Jongwon

doi:10.1002/lpor.202100456

Cited by 20 publications

(2 citation statements)

References 32 publications

(35 reference statements)

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“… – 4 Over the last decade, metasurfaces have been proposed for various applications ranging from imaging 5 , 6 and holography 7 – 9 to the generation of complex vectorial light field patterns 10 – 14 However, most optical metasurfaces demonstrated to date are isolated optical elements that work with external light sources. Recent work indicates that the incorporation of metasurface in a solid-state or fiber laser cavity may enable coherent light emission with tailored spatial mode profile, such as vortex laser beam carrying orbital angular momentum (OAM), in a compact form factor 15 …”

Section: Introductionmentioning

confidence: 99%

Intracavity spatiotemporal metasurfaces

et al. 2023

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Optical metasurfaces are endowed with unparallel flexibility to manipulate the light field with a subwavelength spatial resolution. Coupling metasurfaces to materials with strong optical nonlinearity may allow ultrafast spatiotemporal light field modulation. However, most metasurfaces demonstrated thus far are linear devices. Here, we experimentally demonstrate simultaneous spatiotemporal laser mode control using a single-layer plasmonic metasurface strongly coupled to an epsilon-near-zero (ENZ) material within a fiber laser cavity. While the geometric phase of the metasurface is utilized to convert the laser's transverse mode from a Gaussian beam to a vortex beam carrying orbital angular momentum, the giant nonlinear saturable absorption of the ENZ material enables pulsed laser generation via the Q-switching process. The direct integration of a spatiotemporal metasurface in a laser cavity may pave the way for the development of miniaturized laser sources with tailored spatial and temporal profiles, which can be useful for numerous applications, such as superresolution imaging, high-density optical storage, and three-dimensional laser lithography.

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Section: Introductionmentioning

confidence: 99%

Intracavity spatiotemporal metasurfaces

et al. 2023

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“…To reduce the installation complexity based on the above multiplexing architecture, one possible strategy is to separate different modes into different spatial angles. A typical case of this method is the vortex blazed grating (VGG), [8][9][10] the essence of which is to allocate different modes to different spatial carriers. With the help of anisotropic metasurfaces, [11,12] the VGG can also be extended to polarization-dependent beam multiplexing.…”

Section: Introductionmentioning

confidence: 99%

Broadband, Low‐Crosstalk, and Massive‐Channels OAM Modes De/Multiplexing Based on Optical Diffraction Neural Network

Liu

Gao

Lai

et al. 2023

Laser & Photonics Reviews

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Optical communication technology based on the wavelength, time, polarization, and complex amplitude of light is approaching a bottleneck, while the spatial dimension is relatively unexplored. Orbital angular momentum (OAM) beams are an important group of spatial light beams that are promising for increasing the optical communication capacity based on their orthogonality. To effectively utilize this spatial dimension of light, broadband and low‐crosstalk OAM mode de/multiplexing devices are indispensable. In this work, by exploiting an optical diffraction neural network, a low‐crosstalk OAM de/multiplexer operating in the full C+L band is developed and demonstrated. The device can support 16 OAM modes (l = ±1 to ±8) with 5 phase plates (8‐level phase), and the designed insertion loss and average intermode crosstalk are better than −2.8 and −30.9 dB, respectively. In particular, multiplexing and demultiplexing are experimentally performed on the same device. The measured average insertion loss in mutltiplexing and demulteplexing is −6.1 to −5.4 and −6.8 to −5.8 dB, respectively, and the corresponding average intermode crosstalk is −27.2 to −22.7 and −26.5 to −22.4 dB. The results in this work have great application prospects for the design of mode de/multiplexers and mode division multiplexing communication systems.

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All‐Dielectric Terahertz Metasurfaces for Multi‐Dimensional Multiplexing and Demultiplexing

Liu,

Jiang,

et al. 2024

Laser & Photonics Reviews

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Terahertz (THz) communication is an up‐and‐coming technology for the sixth‐generation wireless network. The realization of ultra‐high‐speed THz communication requires the combination of multi‐dimensional multiplexing schemes, including polarization division multiplexing (PDM), mode division multiplexing (MDM), and wavelength division multiplexing, to increase channel capacity. However, most existing devices for MDM in the THz regime are single‐purpose and incapable of multi‐dimensional modulation. Here, all‐dielectric metasurfaces are designed for 2D multiplexing/demultiplexing, which takes the lead in combining orbital angular momentum (OAM) MDM and PDM in the THz regime. The multi‐functional wavefront phase modulations and interleaved meta‐atom arrangements are used to realize polarization‐selective multichannel OAM mode (de)multiplexing, in which the linear‐polarized 4‐channel and circular‐polarized 6‐channel demultiplexing are experimentally demonstrated. Between different linear‐polarized channels, the measured maximum crosstalk is −16.88 dB, and the isolation of each channel can be greater than 10 dB in a range wider than 0.1 THz. This study paves the way for multi‐dimensional multiplexing in the THz regime, which may benefit extremely high‐capacity and integrated THz communication systems. The proposed design strategy is readily applied to multi‐functional metasurfaces for microwaves and far infrared light, facilitating the development of multiplexing technology and OAM‐related applications.

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E‐Band Metasurface‐Based Orbital Angular Momentum Multiplexing and Demultiplexing

Cited by 20 publications

References 32 publications

Intracavity spatiotemporal metasurfaces

Intracavity spatiotemporal metasurfaces

Broadband, Low‐Crosstalk, and Massive‐Channels OAM Modes De/Multiplexing Based on Optical Diffraction Neural Network

All‐Dielectric Terahertz Metasurfaces for Multi‐Dimensional Multiplexing and Demultiplexing

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