Stretchable Chiral Metamaterial for Flexible Control of Broadband Asymmetric Transmission

Luo, Chen; Sang, Tian; Li, Shi; Yang, Chaoyu; Ge, Zekun; Wang, Yueke

doi:10.1007/s11468-022-01752-2

Cited by 3 publications

(4 citation statements)

References 57 publications

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“…At room temperature, the VO 2 film acts as an insulator. Due to the special design of the top, middle, and bottom metal pattern layers which are similar to the previous work [9,28,29], the metasurface designed in this paper functions as a transmissive polarization converter, converting the incident-specific linear polarization into the corresponding linear cross-polarization. the amplitude of t xy between 5.74 and 6.78 THz exceeds 0.8, while the amplitude of t , yy t xx , and t yx within the range of 4 THz-8 THz are all less than 0.2 during forward transmission.…”

Section: Realizing Broadband Linear To Cross-polarization Conversion ...mentioning

confidence: 96%

“…Thus the structure could realize the expected function in theory. The formula for calculating the absorptance of the absorber can be obtained from equation (9).…”

Section: Realizing Narrowband Bidirectional Absorption When Vo 2 Is M...mentioning

confidence: 99%

“…To address this issue, two common approaches have emerged. The first approach involves using microelectromechanical systems or flexible stretchable media [9] to mechanically change the shape of metasurface unit cells, enabling dynamic tunable functions. The second approach involves integrating tunable materials like graphene [10], Dirac semimetals [11], VO 2 [12], and photosensitive silicon [13] into metasurfaces, combining tunability with multi-functionality.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Switchable bi-functional metasurface for absorption and broadband polarization conversion in terahertz band using vanadium dioxide and photosensitive silicon

Luo,

Qi,

Zhou

et al. 2024

Nanotechnology

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We proposed a bi-functional switchable metasurface based on vanadium dioxide (VO2) and photosensitive silicon. The metasurface functions as a transmissive polarization converter in its insulating state with asymmetric transmission characteristics. It attains a remarkable polarization conversion rate (PCR) surpassing 90% and a notable maximum asymmetric transmission (AT) parameter value of 0.73. This performance is observed within the frequency range from 4.31 THz to 7.86 THz. Dynamic regulation of PCR and AT can be achieved by adjusting the conductivity of photosensitive silicon. To illustrate the underlying factor behind the broadband polarization conversion, the surface current distribution is analyzed at 5.96 THz and 6.08 THz. On the other hand, when VO2 is in the metallic state, the metasurface transforms into a bidirectional absorber with near-perfect absorption in both illumination directions. Under forward incidence of terahertz waves, the absorption rates for the transverse electric (TE) and transverse magnetic (TM) waves are 99.3% at 3.54 THz and 93% at 3.56 THz, respectively. The physical mechanism of near-perfect absorption is explained using impedance matching theory and the electric field distribution. This research expands the applications of transmissive polarization converters within multifunctional metasurfaces, providing new avenues for their practical implementation.

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Section: Realizing Broadband Linear To Cross-polarization Conversion ...mentioning

confidence: 96%

“…Thus the structure could realize the expected function in theory. The formula for calculating the absorptance of the absorber can be obtained from equation (9).…”

Section: Realizing Narrowband Bidirectional Absorption When Vo 2 Is M...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Switchable bi-functional metasurface for absorption and broadband polarization conversion in terahertz band using vanadium dioxide and photosensitive silicon

Luo,

Qi,

Zhou

et al. 2024

Nanotechnology

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show abstract

“…It is widely used to break the structures' geometric symmetry in the wave propagation direction to generate chirality [35,36]. To break the symmetry of our structure, two Au resonators with different patterns (G-shape and J-shape) are placed on the opposite sides of the VO 2 inserted polymer layer as shown in Figure 2.…”

Section: Design and Simulationsmentioning

confidence: 99%

Large-Range Switchable Asymmetric Transmission and Circular Conversion Dichroism in a VO2 Based Metasurface

et al. 2023

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Reconfigurable chiral metasurfaces with a dynamic polarization manipulation capability are highly required in optical integrated systems. In this paper, we simultaneously realized giant and large-range switchable asymmetric transmission (AT) and circular conversion dichroism (CCD) in a vanadium dioxide (VO2) based metasurface. The AT and CCD of the insulator VO2 based metasurface reached 0.95 and 0.92, respectively. Utilizing the insulator-to-metallic phase transition of VO2, the AT and CCD could be continuously switched to near zero. Furthermore, the physics mechanism of the giant and switchable AT and CCD were analyzed. The proposed metasurface with large-range switchable AT and CCD is promising in applications of biochemistry detection, chiral imaging, and biosensing.

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Flexible design of chiroptical response of planar chiral metamaterials using deep learning

Luo,

Sang,

et al. 2024

Opt. Express

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Optical chirality is highly demanded for biochemical sensing, spectral detection, and advanced imaging, however, conventional design schemes for chiral metamaterials require highly computational cost due to the trial-and-error strategy, and it is crucial to accelerate the design process particularly in comparably simple planar chiral metamaterials. Herein, we construct a bidirectional deep learning (BDL) network consists of spectra predicting network (SPN) and design predicting network (DPN) to accelerate the prediction of spectra and inverse design of chiroptical response of planar chiral metamaterials. It is shown that the proposed BDL network can accelerate the design process and exhibit high prediction accuracy. The average process of prediction only takes ∼15 ms, which is 1 in 40000 compared to finite-difference time-domain (FDTD). The mean-square error (MSE) loss of forward and inverse prediction reaches 0.0085 after 100 epochs. Over 95.2% of training samples have MSE ≤ 0.0042 and MSE ≤ 0.0044 for SPN and DPN, respectively; indicating that the BDL network is robust in the inverse deign without underfitting or overfitting for both SPN and DPN. Our founding shows great potentials in accelerating the on-demand design of planar chiral metamaterials.

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Stretchable Chiral Metamaterial for Flexible Control of Broadband Asymmetric Transmission

Cited by 3 publications

References 57 publications

Switchable bi-functional metasurface for absorption and broadband polarization conversion in terahertz band using vanadium dioxide and photosensitive silicon

Switchable bi-functional metasurface for absorption and broadband polarization conversion in terahertz band using vanadium dioxide and photosensitive silicon

Large-Range Switchable Asymmetric Transmission and Circular Conversion Dichroism in a VO2 Based Metasurface

Flexible design of chiroptical response of planar chiral metamaterials using deep learning

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