Bilayer terahertz chiral metasurfaces with different dihedral symmetries

Masyukov, Maxim; Grebenchukov, Alexander; Vozianova, Anna; Khodzitsky, Mikhail K.

doi:10.1364/josab.413212

Cited by 10 publications

(6 citation statements)

References 36 publications

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“…[5][6][7][8][9][10][11][12] However, natural chiral molecules have an extremely weak CD signal since their sizes do not match the wavelength of the incident light, in the range of only a few tens of millidegrees in the ultraviolet region. [13] Inspired by the chiral objects in the physical world, artificial chiral nanostructures made by advanced micro/nanofabrication techniques have attracted tremendous attention for their conspicuous chiroptical effects, [14][15][16][17][18][19] leading to versatile applications such as biosensors, [20][21][22][23][24][25][26][27] miniaturized polarizers, [28][29][30][31][32] metamirrors, [33][34][35] and detectors. [36][37][38] Several schemes have been developed to fabricate chiral metamaterials.…”

Section: Doi: 101002/adma202203956mentioning

confidence: 99%

Ultrathin Suspended Chiral Metasurfaces for Enantiodiscrimination

et al. 2022

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Chiral metasurfaces can exhibit a strong circular dichroism, but it is limited by the complicated fabrication procedure and alignment errors. Here, a new type of self‐aligned suspended chiral bilayer metasurface with only one‐step electron beam lithography exposure is demonstrated. A significant optical chirality of 221° µm−1 can be realized using suspended metasurfaces with a thickness of 100 nm. Furthermore, this study experimentally demonstrates that such a structure is capable of label‐free discrimination of the chiral molecules at zeptomole level, exhibiting a much higher sensitivity (orders of magnitude) compared to the conventional circular dichroism spectroscopy. The fundamental principles for chiral sensing using molecules–metasurfaces interactions are explored. Benefiting from the giant chiroptical response, the proposed metadevice may offer promising applications for ultrathin circular polarizers, chiral molecular detectors, and asymmetry information processing.

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Section: Doi: 101002/adma202203956mentioning

confidence: 99%

Ultrathin Suspended Chiral Metasurfaces for Enantiodiscrimination

et al. 2022

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“…The research and design of high-performance TLCPCMs have broad application prospects [8][9][10][11][12]. Polarization control metasurfaces can be designed by anisotropic structures [13] and chiral structures [14]. In general, polarization control metasurfaces designed by anisotropic structures have a wider operating frequency band and lower insertion loss.…”

Section: Introductionmentioning

confidence: 99%

Inverse design of transmission-type linear-to-circular polarization control metasurface based on deep learning

Hu,

Ma,

Zhang

et al. 2023

J. Phys. D: Appl. Phys.

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To solve the time-consuming and complex design problems, the deep learning method is used to realize the inverse predictive design of a transmission-type linear-to-circular polarization control metasurface (TLCPCM). Firstly, the target-generation neural net-work model (TGNNM) is constructed based on a fully connected neural network (FCNN). The model selects the critical features of the required electromagnetic perfor-mance as design targets, and maps low-dimensional design targets to high-dimensional electromagnetic performance. Secondly, taking the output data of the TGNNM as input data, an inverse-mapping neural network model (IMNNM) is constructed by a convolu-tional neural network (CNN). The prediction performance of the IMNNM is compared with two other inverse-mapping models. The research results show that the IMNNM out-performs the other two networks. Finally, combining TGNNM and IMNNM, four sets of TLCPCM structural parameters are predicted. The research results show that the elec-tromagnetic performances of the metasurface determined by the predicted structural parameters are generally consistent with the given design targets. On this basis, one ex-perimental sample is manufactured. The measurement results are consistent with the simulation results. The research results demonstrate the validity and feasibility of the inverse predictive design method proposed in this paper.

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“…As a fundamental property of EM wave, polarization state describes the oscillating trajectory of EM wave and determines the interaction between EM wave and materials. Polarization manipulation and measurement are always essential researching topics since it could be applied in fields of anisotropy and multiplexing imaging [1][2][3][4], nonlinear interactions [5][6][7], remote sensing [8,9], communication [10,11] and information encryption [12,13] etc The existing methods for polarization measurement could be generally divided into three categories, i.e. measuring Stokes parameters [14][15][16], measuring amplitude ratio and phase difference between orthogonal components [17] and polarization-dependent imaging [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A metasurface-based direct-reading linear polarization analyzer

Feng,

Shou,

et al. 2023

Phys. Scr.

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Polarization state is one of the fundamental properties of electromagnetic (EM) wave, which has been widely investigated in fields of information encryption, remote sensing and multifunctional devices etc The existing methods for polarization detection are generally based on the measurement of Stokes parameters or the amplitude and phase difference between orthogonal components or polarization-dependent imaging. However, they generally requires post-possessing process to identify the polarization state or suffer from the shortcomings of limited detection states, which results in less intuitiveness and limited practical values of those methods. Here, we proposed a metasurface-based and direct-reading linear polarization analyzer, which could reveal the polarization angle of linearly incident plane wave in imaging way by utilizing geometric phase effect. Different linear polarization angles lead to the different positions of the brightest spot, and the polarization state of incident wave could be directly read out by comparing the position of the brightest spot and the index of reference spots above. Besides, this method could be generalized to simplify the process of detecting arbitrary polarization states, with which only the intensity ratio between orthogonal circularly polarized components needs to be measured. Moreover, a digital linear polarization analyzer is designed based on the similar method, which helps to reveal the linear polarization angle digitally and is much more straightforward for linear polarization detection. The proposed direct-reading linear polarization analyzer has the potential of being applied in fields of smart sensing and the development of human-computer interaction system etc.

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Bilayer terahertz chiral metasurfaces with different dihedral symmetries

Cited by 10 publications

References 36 publications

Ultrathin Suspended Chiral Metasurfaces for Enantiodiscrimination

Ultrathin Suspended Chiral Metasurfaces for Enantiodiscrimination

Inverse design of transmission-type linear-to-circular polarization control metasurface based on deep learning

A metasurface-based direct-reading linear polarization analyzer

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