Dipole emission characteristics near a topological insulator sphere coated with a metallic nanoshell

Xie, Huai-Yi; Chang, Rong‐Yeu; Leung, P. T.

doi:10.1016/j.rinp.2021.104014

Cited by 7 publications

(24 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For this case, as in analyzing the peaks of the decay rate spectrum in our previous works [21], we find various peaks in these two figures and have identified [54]. However, for the higher order multipoles, it is observed that both bonding and antibonding modes are hardly distinguishable [21], as manifested in Fig. 4(c) for the order 40  .…”

Section: supporting

confidence: 57%

“…First we choose the dielectric function of a TI core to be that of TiBiSe 2 in the following form [21,27,53]: . To ensure our results are accurate, we compare them with the results obtained in the electrostatics approximation as presented in Ref.…”

Section: (I) Ti Materials Without the Effect Of Lossesmentioning

confidence: 99%

“…As mentioned above, the TME effect is enhanced by localized surface plasmonic resonances at the surface of the metal shells [37][38]. Since localized surface plasmons will enhance the electromagnetic fields in the near zone, there are many practical applications in the aspects of measurement in near field optics such as surface enhanced Raman spectroscope [39][40] and it is possible to open a channel to study the measurable TME-modified modification for plasmonic modes [21,[26][27]. Moreover, it is well-known that a stratified sphere is one of the most versatile systems in its tunability of the plasmonic resonance modes [41].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dyadic Green’s function for a topological insulator stratified sphere

Xie

2023

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

We construct the dyadic Green’s functions (DGFs) for a topological insulator (TI) stratified sphere within the framework of axion electrodynamics. For these DGFs, the additional expansion coefficients are included to account for the axion coupling effect. With the application of these DGFs, we derive the formulation of light scattering from a dipole near a TI stratified sphere. In our numerical studies, we give three types of configurations (a metal-coated TI sphere, a metal-TI-metal-coated TI sphere and an alternating metal-TI stratified sphere) to investigate how the topological magneto-electric (TME) response of the TI sphere (shells) influences on the multipolar plasmonic resonance of the metal shells. For these types, the results show that the TME effect causes some modifications of the decay rate spectrum for an emitting dipole near a TI stratified sphere. For the multipolar resonances of the metal shells, it is observed that the TME-induced red-shifts for the bonding and lower order antibonding modes are found but those for the higher order antibonding modes are insignificant. In addition, for a metal-coated TI sphere, we take into account the effects of losses in the TI core of which the dielectric function is chosen to be the form of the bulk or five quintuple layers (5QL) slab and then the some modifications of the TME-induced decay rate spectrum are obviously suppressed. These phenomenological characteristics provide useful guidance to probing the TME effect via molecular fluorescence experiments.

show abstract

Section: supporting

confidence: 57%

Section: (I) Ti Materials Without the Effect Of Lossesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dyadic Green’s function for a topological insulator stratified sphere

Xie

2023

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

show abstract

“…BP exhibits a large modulation depth but it is easy to oxidize in the ambient air. Despite graphene is characterized by zero bandgap, the modulation depth of single-layer graphene is only about 2.3% [22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Te Film as a Saturable Absorber for the Mid-Infrared Er3+-Doped ZBLAN Fiber Laser

Zhang

Liu

et al. 2022

Front. Phys.

View full text Add to dashboard Cite

We demonstrate a Q-switched Er3+-doped ZBLAN fiber laser at 2.8 µm mid-infrared (mid-IR) region achieved by adopting Te as the saturable absorber mirror (SAM). The modulation depth and saturation intensity of the Te-SAM were measured to be ∼7.2% and 10.81 MW∕cm2, respectively. Stable Q-switched laser pulses with the maximum pulse energy of 3.05 µJ and the minimum pulse width of 0.457 µs at the launched pump power of 4.51 W were obtained. Maximum average output power of 357 mW with repetition rate of 116.98 kHz were achieved. The signal-to-noise ratio (SNR) is 52 dB, which is higher than that of most 2.8 µm mid-infrared Q-switched fiber lasers reported so far. To the best of our knowledge, this is the first demonstration from a Q-switched fiber laser at 2.8 µm based on a Te-SAM.

show abstract

“…In the form of nanoparticles or quantum dots (QDs), 3DTIs have been recently predicted to exhibit interesting optical properties [6][7][8][9][10][11], especially in the THz range. Possible applications include optoelectronic devices to produce THz radiation in the so-called THz gap [12,13], and optically controlled quantum elements for quantum computing [14].…”

mentioning

confidence: 99%

Topological-insulator nanocylinders

Governale

Taddei

2023

SciPost Phys. Core

View full text Add to dashboard Cite

Nanostructures, such a quantum dots or nanoparticles, made of three-dimensional topological insulators (3DTIs) have been recently attracting increasing interest, especially for their optical properties. In this paper we calculate the energy spectrum, the surface states and the dipole matrix elements for optical transitions with in-plane polarization of 3DTI nanocylinders of finite height LL and radius RR. We first derive an effective 2D Hamiltonian by exploiting the cylindrical symmetry of the problem. We develop two approaches: the first one is an exact numerical tight-binding model obtained by discretising the Hamiltonian. The second one, which allows us to obtain analytical results, is an approximated model based on a large-RR expansion and on an effective boundary condition to account for the finite height of the nanocylinder. We find that the agreement between the two models, as far as eigenenergies and eigenfunctions are concerned, is excellent for the lowest absolute value of the longitudinal component of the angular momentum. Finally, we derive analytical expressions for the dipole matrix elements by first considering the lateral surface alone and the bases alone, and then for the whole nanocylinder. In particular, we focus on the two limiting cases of tall and squat nanocylinders. The latter case is compared with the numerical results finding a good agreement.

show abstract

Dipole emission characteristics near a topological insulator sphere coated with a metallic nanoshell

Cited by 7 publications

References 58 publications

Dyadic Green’s function for a topological insulator stratified sphere

Dyadic Green’s function for a topological insulator stratified sphere

Te Film as a Saturable Absorber for the Mid-Infrared Er3+-Doped ZBLAN Fiber Laser

Topological-insulator nanocylinders

Contact Info

Product

Resources

About