Multi-functional polarization conversion manipulation via graphene-based metasurface reflectors

Zhang, Houjiao; Liu, Ye; Liu, Zhengqi; Liu, Xiaoshan; Liu, Guiqiang; Fu, Guolan; Wang, Junqiao; Shen, Yun

doi:10.1364/oe.412925

Cited by 86 publications

(25 citation statements)

References 58 publications

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“…Similarly, graphene as a two-dimensional material, shows a wavelength-independent absorption of ∼2.3% in the near-infrared and visible range. It has been proven that the coupling of graphene and nanostructures not only can enhance absorption − but also be used to achieve induced transparency, polarization conversion, enhancement of nonlinear absorption, and so on. To improve the absorption, the coupling between the metal nanostructure and the monolayer MoS 2 can significantly improve the absorbance of the nanosystem excited by linearly polarized light. − However, the above methods cannot achieve dynamic adjustment of CD signals.…”

Section: Introductionmentioning

confidence: 99%

Circular Dichroism Enhancement and Biosensing Application of Composite Dielectric Chiral Nanostructures

Wang

et al. 2021

J. Phys. Chem. C

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Chiral nanostructures with strong circular dichroism (CD) have been widely used in molecular detection, chemical analysis, and biosensing. However, how to enhance and dynamically adjust the CD signal of the chiral nanostructures is still a current challenge. Here, monolayer molybdic sulfide (MoS2) is introduced into the composite dielectric chiral nanostructures (CDCNs) composed of silicon–vanadium dioxide Z-shaped nanorods placed on the silica–silver substrate to enhance and dynamically adjust the CD signal. Results demonstrate that the coupling between CDCNs and MoS2 results in different absorption enhancing under different circularly polarized lights and strong CD effects. The surface electric field distribution of CDCNs/MoS2 reveals that the three CD signals are mainly due to the surface plasmon polariton on the surface of the silver and the guided mode resonance in silica along the x or y directions, respectively. The CD signals can be actively adjusted through the insulator–metal transition of vanadium dioxide. In addition, the coupling characteristics between different chiral molecules and CDCNs/MoS2 can be applied in the identification of chiral molecules. These results provide a new method for enhancing and dynamically adjusting CD signals and will promote the sensing of chiral molecules.

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Section: Introductionmentioning

confidence: 99%

Circular Dichroism Enhancement and Biosensing Application of Composite Dielectric Chiral Nanostructures

Wang

et al. 2021

J. Phys. Chem. C

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“…[35] Nevertheless, to the best of our knowledge, if multitasking is required, geometric structures of large size are needed, which are not accommodated with terahertz (THz) systems that demand portable, compact features. [36][37][38] Therefore, it is still elusive to achieve wide bandwidth and high efficiency of the complex functional device. Different from existing works, our novel design combines the principle of the tunable multitasking metasurface, transmission-reflection-integrated feature, and JM's directional characteristic together, realizing switching functions among different working frequency bands and full-space polarized wave control.…”

Section: Introductionmentioning

confidence: 99%

Temperature‐Controlled and Photoexcited Multitasking Janus Metasurface in the Terahertz Region

et al. 2022

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In this paper, a photoexcited multitasking Janus metasurface (MJM) based on the phase‐changed material vanadium dioxide and the photosensitive materials silicon and germanium in the terahertz (THz) region is proposed, which also exploits the directionality feature of electromagnetic waves. The MJM can switch its functionalities between working band shifting and full‐space polarized wave control, and six functions can be implemented by exciting the switchable materials. By regulating the power of the incident pump beam, it is feasible to complete band adjustment in terms of normal incidence, i.e. the band range of polarization conversion ratio >0.9 changing from 1.23 THz–1.91 THz to 0.98 THz–1.91 THz in the reflection state and axial ratio (AR) <3 dB band range toggling between 0.69 THz–1.08 THz and 0.67 THz–0.96 THz in the transmission state. However, for the backward incidence,, it presents reflective linear‐to‐circle (LTC) polarization conversion (PC), with AR <3 dB domain of 0.99 THz–1.63 THz. The multiple reflection interference theory and electric field distributions are introduced to interpret the high performance. Moreover, the designed device exhibits a high angular tolerance for achieving LTC PC. The integration of numerous functions in a single structure endows the MJM with the great benefit for efficient polarization‐controlled applications.

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“…The carrier density and chemical potential can be controlled by a gate voltage, V . and patterned metasurfaces [44][45][46][47][48][49][50][51][52][53] . Nevertheless, fabrication challenges in creating metasurfaces, in addition to the lowefficiency and limited compactness of the final structure, limit the effectiveness of this approach.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, fabrication challenges in creating metasurfaces, in addition to the lowefficiency and limited compactness of the final structure, limit the effectiveness of this approach. Moreover, precise control over the dynamical and widely modulating system parameters is needed [44][45][46][47][48][49][50][51][52][53] , thus making atomic-scale optoelectronic elements with controllable material properties a more favorable alternative 54 .…”

Section: Introductionmentioning

confidence: 99%

Controllable nonreciprocal optical response and handedness-switching in magnetized spin orbit coupled graphene

Alidoust,

Halterman

2022

Preprint

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Starting from a low-energy effective Hamiltonian model, we theoretically calculate the dynamical optical conductivity and permittivity tensor of a magnetized graphene layer with Rashba spin orbit coupling (SOC). Our results reveal a transverse Hall conductivity correlated with the usual nonreciprocal longitudinal conductivity. Further analysis illustrates that for intermediate magnetization strengths, the relative magnitudes of the magnetization and SOC can be identified experimentally by two well-separated peaks in the dynamical optical response (both the longitudinal and transverse components) as a function of photon frequency. Moreover, the frequency dependent permittivity tensor is obtained for a wide range of chemical potentials and magnetization strengths. Employing experimentally realistic parameter values, we calculate the circular dichroism of a representative device consisting of magnetized spin orbit coupled graphene and a dielectric insulator layer, backed by a metallic plate. The results reveal that this device has different relative absorptivities for right-handed and left-handed circularly polarized electromagnetic waves. It is found that the magnetized spin orbit coupled graphene supports strong handedness-switchings, effectively controlled by varying the chemical potential and magnetization strength with respect to the SOC strength.

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Multi-functional polarization conversion manipulation via graphene-based metasurface reflectors

Cited by 86 publications

References 58 publications

Circular Dichroism Enhancement and Biosensing Application of Composite Dielectric Chiral Nanostructures

Circular Dichroism Enhancement and Biosensing Application of Composite Dielectric Chiral Nanostructures

Temperature‐Controlled and Photoexcited Multitasking Janus Metasurface in the Terahertz Region

Controllable nonreciprocal optical response and handedness-switching in magnetized spin orbit coupled graphene

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