Angle-independent strong coupling between plasmonic magnetic resonances and excitons in monolayer WS<sub>2</sub>

Li, Hongju; Qin, Meng; Ren, Yongze; Hu, Jigang

doi:10.1364/oe.27.022951

Cited by 43 publications

(23 citation statements)

References 34 publications

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“…2. For the left resonance peak (f = 0.55 THz), it is obvious that the electric field is mainly concentrated on the arms of SRR, which is caused by LC resonance excitation of graphene SRR array [28], as shown in Fig. 2(a).…”

Section: Resultsmentioning

confidence: 99%

Probing Composite Vibrational Fingerprints in the Terahertz Range With Graphene Split Ring Resonator

et al. 2020

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Sensors with single resonant mode often produce false positive when detecting the composite vibrational fingerprints of molecules in the terahertz (THz) range. In this study, a multi-resonant plasmonic structure, consisting of periodic graphene split ring resonator (SRR) arrays, is proposed for THz sensing. The effective detection of ultrathin (0.1 μm) lactose layer is given as an example to demonstrate the detection sensitivity. The vibrational fingerprints of lactose at 0.53 THz and 1.37 THz are enhanced in transmission spectra. Besides, resonant frequencies could be actively adjusted with the gate voltage applied on the SRR array. The physical mechanism of multi-resonance can be explained by a combination of LC resonance and dipole resonance of the structure, which can be observed in the electric field distributions. Moreover, the sensing performance can be further optimized by varying geometric parameters. Furthermore, the refractive index sensing performance of the sensor is also investigated by altering the surrounding medium on the surface. The designed sensor can work under an oblique incidence, which provides potential applications in biological analysis and medical diagnostics.

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Section: Resultsmentioning

confidence: 99%

Probing Composite Vibrational Fingerprints in the Terahertz Range With Graphene Split Ring Resonator

et al. 2020

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“…Over the past decade, the strong coupling between the excitons of TMDCs and optical microcavities was mostly realized by metallic nanocavities supporting surface plasmon polaritons, which can strongly confine the electric field in ultrasmall mode volume [16][17][18] . However, the metal has thermal instability in visible region due to large ohmic loss.…”

Section: Introductionmentioning

confidence: 99%

Strong coupling between excitons and magnetic dipole quasi-bound states in the continuum in WS$_2$-TiO$_2$ hybrid metasurfaces

Qin,

Xiao,

Liu

et al. 2021

Preprint

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Enhancing the light-matter interactions in two-dimensional materials via optical metasurfaces has attracted much attention due to its potential to enable breakthrough in advanced compact photonic and quantum information devices. Here, we theoretically investigate a strong coupling between excitons in monolayer WS2 and quasi-bound states in the continuum (quasi-BIC). In the hybrid structure composed of WS2 coupled with asymmetric titanium dioxide nanobars, a remarkable spectral splitting and typical anticrossing behavior of the Rabi splitting can be observed, and such strong coupling effect can be modulated by shaping the thickness and asymmetry parameter of the proposed metasurfaces. It is found that the balance of line width of the quasi-BIC mode and local electric field enhancement should be considered since both of them affect the strong coupling, which is crucial to the design and optimization of metasurface devices. This work provides a promising way for controlling the light-matter interactions in strong coupling regime and opens the door for the future novel quantum, low-energy, distinctive nanodevices by advanced meta-optical engineering.

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“…In recent years, many researchers have investigated strong coupling between the TMDs and plasmonic/dielectric nanostructures [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] , and developed a general approach to employ the coupled harmonic oscillator model for such hybrid systems, in which nanostructures are treated as an isolated system and the influence of external excitation is ignored. However, the coupled systems are open in nature, where different resonant modes couple not only with each other via near field but also with the external free space 33 .…”

Section: Introductionmentioning

confidence: 99%

Manipulating strong coupling between exciton and quasi-bound states in the continuum resonance

Qin,

Duan,

Xiao

et al. 2021

Preprint

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Angle-independent strong coupling between plasmonic magnetic resonances and excitons in monolayer WS₂

Cited by 43 publications

References 34 publications

Probing Composite Vibrational Fingerprints in the Terahertz Range With Graphene Split Ring Resonator

Probing Composite Vibrational Fingerprints in the Terahertz Range With Graphene Split Ring Resonator

Strong coupling between excitons and magnetic dipole quasi-bound states in the continuum in WS$_2$-TiO$_2$ hybrid metasurfaces

Manipulating strong coupling between exciton and quasi-bound states in the continuum resonance

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Angle-independent strong coupling between plasmonic magnetic resonances and excitons in monolayer WS2

Cited by 43 publications

References 34 publications

Probing Composite Vibrational Fingerprints in the Terahertz Range With Graphene Split Ring Resonator

Probing Composite Vibrational Fingerprints in the Terahertz Range With Graphene Split Ring Resonator

Strong coupling between excitons and magnetic dipole quasi-bound states in the continuum in WS$_2$-TiO$_2$ hybrid metasurfaces

Manipulating strong coupling between exciton and quasi-bound states in the continuum resonance

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Angle-independent strong coupling between plasmonic magnetic resonances and excitons in monolayer WS₂