Bandwidth broadening of a linear polarization converter by near-field metasurface coupling

Gao, Xi; Singh, Leena; Yang, W. L.; Jiao, Z.; Li, Haiou; Zhang, Weili

doi:10.1038/s41598-017-07296-4

Cited by 41 publications

(22 citation statements)

References 23 publications

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“…Noble metals, such as gold, have high efficiency for metasurface-based polarization converter designing. Double L-shaped pattern with two metallic gratings in [ 18 ] rotates a linear polarization (LP) by 90°. The bandwidth of the converter in [ 18 ] is 0.2–0.4 THz (66.7%).…”

Section: Introductionmentioning

confidence: 99%

Multi-functional Device with Switchable Functions of Absorption and Polarization Conversion at Terahertz Range

Peng

Xing

2018

Nanoscale Res Lett

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Terahertz electromagnetic (EM) wave components usually have a single function, such as they can only convert the polarization state of an incident wave or absorb the incident energy, which would be a limitation for their applications. To make a breakthrough, a multi-functional device (MFD) is proposed in this paper, and it is capable of switching between absorption mode and polarization conversion mode. The device has a low-profile and simple structure, and it is constructed by graphene-based absorbing metasurface (AM) and gold-based polarization conversion metasurface (PCM). By controlling the chemical potential (μc) of the graphene, the leading role is transferred between the AM and the PCM, which leads to steerable absorption and polarization conversion (PC) modes. For the PC mode, the simulated polarization conversion ratio (PCR) is larger than 0.9 in the 2.11–3.63-THz band (53.0% at 2.87 THz). For the absorption mode, the simulated absorptivity is larger than 80% in the 1.59–4.54-THz band (96.4% at 3.06 THz). The physical mechanisms and operating characteristics of the MFD are discussed. This research has potential applications in terahertz imaging, sensors, photodetectors, and modulators.

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Section: Introductionmentioning

confidence: 99%

Multi-functional Device with Switchable Functions of Absorption and Polarization Conversion at Terahertz Range

Peng

Xing

2018

Nanoscale Res Lett

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“…It can be seen that increasing the order of the fractal geometry from two (second iteration) to four (fourth iteration) results in increase of mutual coupling between the adjacent square metallic patches. For the case of fourth order of fractal, the electric field distribution between the adjacent metallic patches reaches maximum; thereby signifying the enhancement of mutual coupling among the fractal metallic patches …”

Section: Design Of the Structurementioning

confidence: 99%

“…For the case of fourth order of fractal, the electric field distribution between the adjacent metallic patches reaches maximum; thereby signifying the enhancement of mutual coupling among the fractal metallic patches. 33…”

Section: Design Of the Structurementioning

confidence: 99%

A metasurface‐based broadband quasi nondispersive cross polarization converter for far infrared region

Nilotpal

Nama

Bhattacharyya

et al. 2019

Int J RF Microw Comput Aided Eng

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A broadband nondispersive cross polarization converter (CPC) structure using metasurface for far infrared region has been proposed in this article. The structure is transmittive in nature, which converts a linearly polarized incident wave to its mutually orthogonal linearly polarized wave over a band of frequency ranging from 10.25 to 22.7 THz maintaining a high polarization conversion ratio (PCR) of more than 0.95. The fractional bandwidth of 75.6% corresponding to the center frequency of PCR bandwidth having more than 0.9 PCR value has been realized. The structure is also studied for oblique incidences where it shows wide band polarization conversion up to 45° for both TE and TM polarized oblique incident waves. The electric field distributions at the top and bottom surfaces of the structure close to the center frequency of polarization conversion bandwidth indicate the orthogonal rotation of incident linearly polarized wave at the frequency of interest. For the given set of media interface a separate study on polarization conversion through Brewster angle concept has been carried out simultaneously. The structure exhibits high PCR by maintaining the compactness in thickness (~ λ/5) as well as periodicity (~ λ/3) compared to the existing reported ones.

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“…An alternative to complex three-dimensional structures can be flat metamaterials with a thickness tens of wavelength, called metasurfaces. They consist of a single-layer 12 or multi-layer 13 stacks of flat structures that can be easily made by nanoprinting and lithography techniques, and the extremely thin thickness in the direction of wave propagation can significantly suppress undesirable losses. Planar metamaterials, or metasurfaces 14 , provide a spatially varying optical response and provide the simpler integration of functional materials to achieve active control of transmitted or reflected light parameters (intensity, phase, polarization, etc.)…”

mentioning

confidence: 99%

Optically tunable terahertz chiral metasurface based on multi-layered graphene

Masyukov

Vozianova

Grebenchukov

et al. 2020

Sci Rep

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Active manipulation of the polarization states at terahertz frequencies is crucially helpful for polarization-sensitive spectroscopy, having significant applications such as non-contact Hall measurements, vibrational circular dichroism measurements and anisotropy imaging. the weakness of polarization manipulation provided by natural materials can be overcomed by chiral metamaterials. Chiral metamaterials have a huge potential to achieve the necessary polarization effects, hence they provide the basis for applications such as ultracompact polarization components. terahertz chiral metamaterials that allow dynamic polarization modulation of terahertz waves are of great practical interest and still challenging. Here, we show that terahertz metasurface based on the four conjugated "petal" resonators integrated with multi-layered graphene (MLG) can enable dynamically tunable chiroptical response using optical pumping. In particular, a change of ellipticity angle of 20° is observed around 0.76 THz under optical pumping by a 980 nm continuous wave (CW) laser. Furthermore, using temporal coupled-mode theory, our study also reveals that the chiroptical response of the proposed multi-layered graphene-based metasurface is strongly dependent on the influence of optical pumping on the loss parameters of resonance modes, leading to actively controllable polarization states of the transmitted terahertz waves. the present work paves the way for the realization of fundamental terahertz components capable for active polarization manipulation.

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Bandwidth broadening of a linear polarization converter by near-field metasurface coupling

Cited by 41 publications

References 23 publications

Multi-functional Device with Switchable Functions of Absorption and Polarization Conversion at Terahertz Range

Multi-functional Device with Switchable Functions of Absorption and Polarization Conversion at Terahertz Range

A metasurface‐based broadband quasi nondispersive cross polarization converter for far infrared region

Optically tunable terahertz chiral metasurface based on multi-layered graphene

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