Nonvolatile chirality switching in terahertz chalcogenide metasurfaces

Bao, Jiaxin; Chen, Xieyu; Liu, Kuan; Yu, Zhan; Li, Haiyang; Zhang, Shoujun; Xu, Yifan; Tian, Zhen; Cao, Tun

doi:10.1038/s41378-022-00445-4

Cited by 8 publications

(3 citation statements)

References 62 publications

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“…Tunable filters and absorptive metasurfaces include works such as [28,[50][51][52][53][54][55][56][57]. Non-resonant phase gradient metasurfaces based on Panchratnam Berry or geometric phase shift have been investigated for applications such as tunable holograms [58][59][60], zoom lenses [61][62][63][64][65], beam deflectors [66][67][68][69] and chiral devices [70,71].…”

Section: Classification Of Pcm Nanophotonic Structuresmentioning

confidence: 99%

“…Bao et al [71] realized a tunable chiral metamaterial consisting of an H shaped resonator made of GST and Gold paired with parallel Gold strips at the backside (figure 11(B)). When passing LCP and RCP waves through the metamaterial, the structure exhibits intrinsic chirality under the amorphous phase of GST as seen in the transmission dips at 0.73 THz and 0.85 THz of figure 11(B).…”

Section: Chiralitymentioning

confidence: 99%

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Recent developments in Chalcogenide phase change material-based nanophotonics

Tripathi,

Vyas,

Kumar

et al. 2023

Nanotechnology

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There is now a deep interest in actively reconfigurable nanophotonics as they will enable the next generation of optical devices. Of the various alternatives being explored for reconfigurable nanophotonics, Chalcogenide phase change materials (PCMs) are considered highly promising owing to the nonvolatile nature of their phase change. Chalcogenide PCM nanophotonics can be broadly classified into integrated photonics (with guided wave light propagation) and Meta-optics (with free space light propagation). Despite some early comprehensive reviews, the pace of development in the last few years has shown the need for a topical review. Our comprehensive review covers recent progress on nanophotonic architectures, tuning mechanisms, and functionalities in tunable PCM Chalcogenides. In terms of integrated photonics, we identify novel PCM nanoantenna geometries, novel material utilization, the use of nanostructured waveguides, and sophisticated excitation pulsing schemes. On the meta-optics front, the breadth of functionalities has expanded, enabled by exploring design aspects for better performance. The review identifies immediate, and intermediate-term challenges and opportunities in (1) the development of novel chalcogenide PCM, (2) advance in tuning mechanism, and (3) formal inverse design methods, including machine learning augmented inverse design, and provides perspectives on these aspects. The topical review will interest researchers in further advancing this rapidly growing subfield of nanophotonics.

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Section: Classification Of Pcm Nanophotonic Structuresmentioning

confidence: 99%

Section: Chiralitymentioning

confidence: 99%

Recent developments in Chalcogenide phase change material-based nanophotonics

Tripathi,

Vyas,

Kumar

et al. 2023

Nanotechnology

View full text Add to dashboard Cite

show abstract

“…When the operation is resumed, a strong current pulse is applied to rapidly heat the phase change material to an amorphous state. According to the resistance state of the material, it is possible to determine whether the stored data is "0" or "1" [20][21][22][23][24][25] . Based on the above advantages, PCM has become a candidate for the next generation memory, and has broad development prospects in various applications.…”

Section: Introductionmentioning

confidence: 99%

Phase transition and electrical conversion properties of Ge/Sb nano-multilayer films on flexible substrates

Wang,

Hu,

2024

npj Flex Electron

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Flexible information memory is the key component of flexible electronic devices and the core of intelligent wearable devices. In this paper, Ge/Sb multilayer phase change films of various thickness ratios were prepared using polyether ether ketone as substrate, and their flexible phase change properties and device conversion characteristics were studied. After bending for 100000 times and bending experiments with different bending radius, the film can still realize the transition from amorphous to crystalline states, and the resistance fluctuation was small. Bending, stretching and pressing of the film resulted in grain refinement and increasing of crystalline resistance. The flexible electronic devices using Ge/Sb multilayer films were prepared. The phase change memory device can realize reversible conversion between SET and RESET states with different pulse widths in flat, bent states and after bending many times. All findings show that Ge/Sb multilayer films on PEEK substrate have broad application prospects in high-performance flexible memory in the future.

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Microelectromechanical System-Based Reconfigurable Terahertz Metamaterial for Polarization Filter, Switch, and Logic Modulator Applications

Li,

Yu,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

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The terahertz (THz) metamaterials integrated with microelectromechanical systems (MEMS) have led to the realization of dynamic control in amplitude, phase, polarization, and spin angular momentum of the THz wave. In this study, we demonstrate an MEMS-based reconfigurable THz metamaterial (RTM) composed of a split ring resonator (SRR) for real-time modulation of THz wave. By gradually increasing the polarization angle of the incident THz wave, the resonant frequency of SRR switches from 0.74 to 1.16 THz, and the maximum modulation depth is more than 70%. When the MEMS-based RTM is actuated by different DC bias voltages, the polarization-dependent transmission intensity and resonant frequency of the device can be actively tuned. MEMS-based RTM shows logical function characteristics that can be used for logic modulators by performing the driving voltages and polarization states as 2-bit input signals and quantizing the transmission response as "on" and "off" states. The logic gates of "NAND" are at 0.439 THz and "AND" is at 0.732 THz. These results offer potential applications for the proposed MEMS-based RTM in tunable and reconfigurable polarization filters, optical switches, programmable logic modulators, and so on.

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Nonvolatile chirality switching in terahertz chalcogenide metasurfaces

Cited by 8 publications

References 62 publications

Recent developments in Chalcogenide phase change material-based nanophotonics

Recent developments in Chalcogenide phase change material-based nanophotonics

Phase transition and electrical conversion properties of Ge/Sb nano-multilayer films on flexible substrates

Microelectromechanical System-Based Reconfigurable Terahertz Metamaterial for Polarization Filter, Switch, and Logic Modulator Applications

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