Tunable Ultra‐High Q‐Factor and Figure of Merit based on Fano Resonance in Graphene–Dielectric Multilayer Corrugated Structure

Jiang, Xin; Liu, Weiwei; Zhang, Bing; Sun, Xiudong

doi:10.1002/adom.202001443

Cited by 7 publications

(2 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High-quality guided modes can also be created and tuned using graphenebased structures using TE polarization. 22 This polarization does not excite plasmons in the graphene layer; the presence of the graphene grating instead enables the excitation of guided modes in the dielectric layer. The field profile of a guided mode in our grating structure is shown in Figure 1c.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…However, plasmonic resonances are typically lossy, resulting in low-quality factors. High-quality guided modes can also be created and tuned using graphene-based structures using TE polarization . This polarization does not excite plasmons in the graphene layer; the presence of the graphene grating instead enables the excitation of guided modes in the dielectric layer.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Nonreciprocal Thermal Emission Using Spatiotemporal Modulation of Graphene

et al. 2022

View full text Add to dashboard Cite

We present a nonreciprocal thermal emitter based on the dynamic modulation of graphene. A graphene ribbon grating situated on a dielectric slab is designed to excite high-quality resonances in the long-IR region. We show that upon space–time modulation of the Fermi energy of graphene, asymmetric modal splitting results in large nonreciprocity, leading to a strong violation of Kirchhoff’s law of thermal radiation. We further show that the graphene system allows the creation of “absorptivity holes” and “emissivity holes” in the spectrum that are asymmetric. By changing the modulation frequency, the location of these holes can be adjusted, giving rise to a new dimension of tunable thermal emission in nonreciprocal systems. In this system, while Kirchhoff’s law is violated, we numerically observe certain symmetry properties between absorption and emission. We establish that these symmetry properties follow compound symmetry considerations.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Nonreciprocal Thermal Emission Using Spatiotemporal Modulation of Graphene

et al. 2022

View full text Add to dashboard Cite

show abstract

Tunable ultra-high quality factor graphene absorber based on semicylindrical silica array and distributed Bragg reflector structure

et al. 2022

View full text Add to dashboard Cite

We propose a tunable narrowband absorber by utilizing a graphene monolayer placed between a dielectric semicylindrical array and a multilayer silica/silicon distributed Bragg reflector (DBR) structure. The multi-band perfect absorption can be achieved due to the excitation of multiple resonant modes in the absorber, including the guided mode resonance of the dielectric silica array and BR-based guided mode resonance in the DBR structure. The ultra-high quality factor (Q) is mainly attributed to the low external leakage loss of the resonator and the low intrinsic loss of the graphene monolayer. Moreover, the Q-factor of absorption peaks can be tuned by electrically controlling the Fermi energy of graphene. The sensitivity of a spectral wavelength shift for the refractive index change of the resonator is up to 730 nm/RIU, and the figure of merit is 1043. The proposed graphene-based metamaterial offers potential applications for photodetectors, optical modulators, and sensors in the near infrared frequency regime.

show abstract

Tunable quasi-bound states in the continuum in magneto-optical metasurfaces

Yao,

Su,

et al. 2024

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The enhancement of electromagnetic field with high Q factor in metasurface has attracted extension attention. Magneto-optical metasurface (MOMS) provides approaches with controllable magnetic field to modulate optical response, which contribute to the magneto-optical Kerr effect in nanophotonic devices. However, it is a challenge for MOMS to obtain narrow spectra peak with high Q factor. Here we propose a MOMS supporting quasi bound states in the continuum (quasi-BIC) and theoretically investigate the evolution process from BIC to quasi-BIC. By applying external magnetic field, the BIC in our proposed metasurface can transform into quasi-BIC with finite Q factor up to 33620. Meanwhile, the quasi-BIC shows magnetization-related circular dichroism with a vortex point in polarization graph, based on time-reversal symmetry breaking in magneto-optical material under condition of external magnetic field. The quasi-BIC also keeps nearly unity reflection and almost zero absorption, which shows promising future in sensing. Our results enrich the light control mechanisms of MOMS, and provide a unique opportunity for applications requiring flexible tunability and high Q factors, such as sensor, laser source, filter and chiral-related elements.

show abstract

Tunable Ultra‐High Q‐Factor and Figure of Merit based on Fano Resonance in Graphene–Dielectric Multilayer Corrugated Structure

Cited by 7 publications

References 32 publications

Nonreciprocal Thermal Emission Using Spatiotemporal Modulation of Graphene

Nonreciprocal Thermal Emission Using Spatiotemporal Modulation of Graphene

Tunable ultra-high quality factor graphene absorber based on semicylindrical silica array and distributed Bragg reflector structure

Tunable quasi-bound states in the continuum in magneto-optical metasurfaces

Contact Info

Product

Resources

About