Switchable Chiral Mirrors

Li, Meng; Plum, Eric; Li, Hua; Duan, Siyu; Li, Shaoxian; Xu, Quan; Zhang, Xueqian; Zhang, Caihong; Zou, Chongwen; Jin, Biaobing; Han, Jiaguang; Zhang, Weili

doi:10.1002/adom.202000247

Cited by 54 publications

(45 citation statements)

References 53 publications

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“…The data that support the findings of this study are openly available in the University of Southampton ePrints research repository at https:// doi.org/10.5258/SOTON/D1646, reference number [34].…”

Section: Conflict Of Interestsupporting

confidence: 61%

“…[2] Optical activity corresponds to different Electromechanically reconfigurable metamaterials have enabled substantial electric control over optical activity, [17][18][19][20][21] while phase transitions in THz metamaterials have enabled control over the related phenomena of asymmetric transmission [22] and chiral mirrors. [23] Here, we demonstrate temperature-controlled chirality, optical activity, and index of refraction. Switching between effectively chiral and achiral structures is achieved by exploiting the insulator-to-metal phase transition of vanadium dioxide in a THz metamaterial.…”

Section: Introductionmentioning

confidence: 83%

“…[ 15,16 ] Electromechanically reconfigurable metamaterials have enabled substantial electric control over optical activity, [ 17–21 ] while phase transitions in THz metamaterials have enabled control over the related phenomena of asymmetric transmission [ 22 ] and chiral mirrors. [ 23 ]…”

Section: Introductionmentioning

confidence: 99%

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Temperature‐Controlled Optical Activity and Negative Refractive Index

Plum

et al. 2021

Adv Funct Materials

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102

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Chiral media exhibit optical activity, which manifests itself as differential retardation and attenuation of circularly polarized electromagnetic waves of opposite handedness. This effect can be described by different refractive indices for left-and right-handed waves and yields a negative index in extreme cases. Here, active control of chirality, optical activity, and refractive index is demonstrated. These phenomena are observed in a terahertz metamaterial based on 3D-chiral metallic resonators and achiral vanadium dioxide inclusions. The chiral structure exhibits pronounced optical activity and a negative refractive index at room temperature when vanadium dioxide is in its insulating phase. Upon heating, the insulator-to-metal phase transition of vanadium dioxide effectively renders the structure achiral, resulting in absence of optical activity and a positive refractive index. The origin of the structure's chiral response is traced to magnetic coupling between front and back of the structure, whereas the temperature-controlled chiral-to-achiral transition is found to correspond to a transition from magnetic to electric dipole excitations. The use of a fourfold rotationally symmetric design avoids linear birefringence and dichroism, allowing such a structure to operate as tunable polarization rotator, adjustable linear polarization converter, and switchable circular polarizer.

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Section: Conflict Of Interestsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 83%

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Temperature‐Controlled Optical Activity and Negative Refractive Index

Plum

et al. 2021

Adv Funct Materials

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102

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“…Furthermore, once the CMA is designed, the chiral response is fixed and cannot be flexibly tuned. Although there are a few works reporting active chiral absorption by integrating functional materials into the structure design, including electrical control, [ 16–18 ] temperature control, [ 19 ] and mechanical control, [ 20,21 ] such methods either are accompanied with frequency shift or have limited modulation depth. In comparison, coherent control method provides an excellent way to simplify the design, and offers the ability in achieving active control of the chiral response at the same time.…”

Section: Introductionmentioning

confidence: 99%

Coherent Chiral‐Selective Absorption and Wavefront Manipulation in Single‐Layer Metasurfaces

Zhang

et al. 2020

Advanced Optical Materials

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Recently, chiral metasurfaces have drawn enormous attentions due to their flexibility in realizing nearly arbitrary chiral effect with designable strength. One intriguing direction in this field is chiral‐selective absorption. However, previous studies mostly require multilayer design and meanwhile often work in a passive way. Here, for the first time to the authors’ knowledge, a chiral‐selective metasurface absorber is experimentally demonstrated with a single‐layer free‐standing metasurface using coherent control method, where the strength of the chiral‐selective behavior can be actively tuned with a 100% modulation depth by simply changing the phase difference between the two coherent inputs. Specifically, under coherent symmetric illumination, near unity absorption is achieved for one circularly polarized incidence, while high‐efficiency cross‐polarization conversion is obtained for the other circularly polarized incidence. Such chiral‐selective absorption property is quite suitable for achieving coherent chiral‐selective wavefront control for the unabsorbed circularly polarized incidence. Three coherent chiral metagratings are designed and experimentally characterized by further employing Pancharatnam–Berry phase method and multiplexed method, where very good performances are achieved. The proposed approach on coherent control can enrich the functionalities and also improve the performances of the conventional single‐layer metasurfaces, which can find extending applications in various practical cases.

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“…[16][17][18] Moreover, some functional materials, such as graphene, phase change materials, and liquid crystals, have been combined with the chiral metasurfaces to achieve active modulations on THz chirality by the external thermal, optical, or electric field. [19][20][21][22] For example, Kim et al [23] achieved an electrically gate-controlled active graphene chiral metamaterial with a large intensity modulation of a 45 dB CD value. However, graphene or VO 2 itself does not have anisotropy, so the chirality excitation of devices can only rely on a doublelayer or more complex three-dimensional artificial structures, while the functional materials mainly play the role of active intensity modulation, to achieve the switching function of the chirality state.…”

mentioning

confidence: 99%

Magnetically Induced Terahertz Birefringence and Chirality Manipulation in Transverse‐Magnetized Metasurface

Fan

Zhao²,

Tan

et al. 2021

Advanced Optical Materials

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Active manipulation of photonic spin state and optical chirality leads to some key applications, such as in multichannel communication, polarization‐sensitive imaging, chiral spectroscopy, and chiral sensing. Magneto‐optical materials have unique advantages in the intrinsic transmission and magnetic control of photonic chiral spin states. Here, a scheme for dynamic terahertz (THz) anisotropy and chirality manipulations in the transversely magnetized InSb and its hybrid magneto‐optical metasurface structure is presented. A special transverse photonic spin state in the InSb and a transverse−longitudinal spin coupling effect in the hybrid magneto‐optical metasurface are revealed by the eigenmode analysis and numerical simulations. The strong magnetic birefringence effect induced by this spin mode is demonstrated in the experiment. Moreover, the symmetry‐breaking mechanism in this magneto‐optical structure leads to strong intrinsic chirality and polarization conversion. The experimental results confirm the magnetically active manipulation of spin states and their asymmetric transmission in this hybrid magneto‐optical metasurface, which achieve a polarization conversion rate of near 100% and an induced intrinsic chirality of over 15 dB. This work opens a new development for active THz polarization control and chiral manipulation in the magneto‐optical microstructure.

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Switchable Chiral Mirrors

Cited by 54 publications

References 53 publications

Temperature‐Controlled Optical Activity and Negative Refractive Index

Temperature‐Controlled Optical Activity and Negative Refractive Index

Coherent Chiral‐Selective Absorption and Wavefront Manipulation in Single‐Layer Metasurfaces

Magnetically Induced Terahertz Birefringence and Chirality Manipulation in Transverse‐Magnetized Metasurface

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