Tunable chiroptical response of graphene achiral metamaterials in mid-infrared regime

Zhou, Shaoen; Lai, Pengtao; Dong, Guohua; Li, Ping; Li, Yuxiang; Zhu, Zheng; Guan, Chunying; Shi, Jinhui

doi:10.1364/oe.27.015359

Cited by 30 publications

(13 citation statements)

References 51 publications

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“…The other method is obliquely illuminating the achiral nanostructures. For example, an external CD signal with an FWHM of 4.5 THz and an intensity of 0.7 was achieved, when achiral metallic split ring apertures with complementary graphene rings are excited obliquely . The bound states in the continuum (BIC) can generate ultra-narrowband (UNB) CD signals. , The measurement of BIC signals needs to slightly break the symmetry, leading to BIC leakage to quasi-BIC.…”

Section: Introductionmentioning

confidence: 99%

Enhancement and Sensing Application of Ultra-Narrowband Circular Dichroism in the Chiral Nanostructures Based on Monolayer MoS₂ and a Distributed Bragg Reflector

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Narrowband circular dichroism (CD) has aroused wide concerns in high-sensitivity detections of chiral molecular and chiral catalysis. Nevertheless, the dynamical adjustment of ultranarrowband (UNB) CD signals is hard to achieve. In this work, single-layer molybdenum disulfide (MoS 2 ), vanadium dioxide (VO 2 ), and a distributed Bragg reflector (DBR) are introduced into X-shaped chiral nanostructures (XCNs) for overcoming the above challenge. The simulation results show that XCNs can generate four strong UNB CD signals in the near-infrared band, and XCNs/MoS 2 can further enhance the UNB CD signals. The full width at half-minimum of UNB CD signals can reach 0.14 nm. The electric field distributions of XCNs/MoS 2 show that the four CD signals originate from the coupling between the guided mode resonances along the x and y axes in the VO 2 layer and the Tamm plasmon polaritons along the x and y axes in the DBR layer. Four UNB CD peaks can be actively tuned by varying the structural parameters, the number of MoS 2 layers, and the environmental temperature. The FOM of XCNs/MoS 2 can reach 1487 by changing the refractive index of the DRB layers. These findings contribute to the design of UNB chiral devices and provide new possibilities for environmental monitoring and ultrasensitive detection of chiral molecules.

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Section: Introductionmentioning

confidence: 99%

Enhancement and Sensing Application of Ultra-Narrowband Circular Dichroism in the Chiral Nanostructures Based on Monolayer MoS₂ and a Distributed Bragg Reflector

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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“…One is to enhance the resonance properties by designing metamaterial structures to achieve ultrawideband, such as all dielectric array structure [8], stacking structure [9], coupling metal resonator structures of various sizes [10], conical structure [11] and three-dimensional spiral structure [12]. The other is to introduce the properties of emerging 2D materials, such as black phosphorus [13], graphene [14], molybdenum sulfide [15] and so on.…”

Section: Introductionmentioning

confidence: 99%

Background Insensitive Polarization-Independent Ultra-Broadband Metamaterial Perfect Absorber in Mid-Infrared Regions

Yang

Mei

et al. 2022

IEEE Photonics J.

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The mid-infrared absorber is an important device for effective capture of high by atmospheric infrared transparent window, and has been a research hotspot in military, medical, biological and other fields. In this paper, a kind of ultra-thin midinfrared ultra-broadband absorber with background insensitive is realized by stacking four metal/dielectric films (Si/Ag/Si3N4/SiO2) on silver substrate and periodically arranged cross-anchor metal pattern in a method of finite-difference time domain. The results show that the absorption rate is more than 90% and the relative absorption bandwidth is 95.5% in the wavelength ranging from 9.1μm to 24.1μm. The average absorptivity is 92% in the range of background refractive index (n=1~1.8), A proof of the device's insensibility to background refractive index. At a large incidence angle ( θ ≤ 50 °), the lowest absorption rate is up to 80%. The thickness of the optimized device is only 1.7μm. The research results have important application value in infrared remote sensing, pollution monitoring, disease diagnosis and other fields.

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“…In the past few years, much effort has been made to actively manipulate the transmission, reflection, or absorption spectra of electromagnetic waves, which is based on electrically tunable surface conductivity of graphene, in a very wide frequency range including microwave [5,6], terahertz (THz) , infrared , and visible regime [66][67][68][69]. Such graphene-based active manipulation of electromagnetic waves is under external electrical stimulus without re-building-related structures, which aims to efficiently modulate the amplitude [5, 7-21, 34-57, 66-72], phase [6,[22][23][24][25][26][27][28][58][59][60][61][62], and polarization [29-33, [63][64][65] of electromagnetic waves. The three kinds of electromagnetic wave modulators are the most important for signal processing in free-space optical communications [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Efficient Optical Reflection Modulation by Coupling Interband Transition of Graphene to Magnetic Resonance in Metamaterials

Yan

Tang

et al. 2019

Nanoscale Res Lett

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Designing powerful electromagnetic wave modulators is required for the advancement of optical communication technology. In this work, we study how to efficiently modulate the amplitude of electromagnetic waves in nearinfrared region, by the interactions between the interband transition of graphene and the magnetic dipole resonance in metamaterials. The reflection spectra of metamaterials could be significantly reduced in the wavelength range below the interband transition, because the enhanced electromagnetic fields from the magnetic dipole resonance greatly increase the light absorption in graphene. The maximum modulation depth of reflection spectra can reach to about 40% near the resonance wavelength of magnetic dipole, for the interband transition to approach the magnetic dipole resonance, when an external voltage is applied to change the Fermi energy of graphene.

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Tunable chiroptical response of graphene achiral metamaterials in mid-infrared regime

Cited by 30 publications

References 51 publications

Enhancement and Sensing Application of Ultra-Narrowband Circular Dichroism in the Chiral Nanostructures Based on Monolayer MoS₂ and a Distributed Bragg Reflector

Enhancement and Sensing Application of Ultra-Narrowband Circular Dichroism in the Chiral Nanostructures Based on Monolayer MoS₂ and a Distributed Bragg Reflector

Background Insensitive Polarization-Independent Ultra-Broadband Metamaterial Perfect Absorber in Mid-Infrared Regions

Efficient Optical Reflection Modulation by Coupling Interband Transition of Graphene to Magnetic Resonance in Metamaterials

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Tunable chiroptical response of graphene achiral metamaterials in mid-infrared regime

Cited by 30 publications

References 51 publications

Enhancement and Sensing Application of Ultra-Narrowband Circular Dichroism in the Chiral Nanostructures Based on Monolayer MoS2 and a Distributed Bragg Reflector

Enhancement and Sensing Application of Ultra-Narrowband Circular Dichroism in the Chiral Nanostructures Based on Monolayer MoS2 and a Distributed Bragg Reflector

Background Insensitive Polarization-Independent Ultra-Broadband Metamaterial Perfect Absorber in Mid-Infrared Regions

Efficient Optical Reflection Modulation by Coupling Interband Transition of Graphene to Magnetic Resonance in Metamaterials

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Enhancement and Sensing Application of Ultra-Narrowband Circular Dichroism in the Chiral Nanostructures Based on Monolayer MoS₂ and a Distributed Bragg Reflector

Enhancement and Sensing Application of Ultra-Narrowband Circular Dichroism in the Chiral Nanostructures Based on Monolayer MoS₂ and a Distributed Bragg Reflector