Finite-difference time-domain modeling of curved material interfaces by using boundary condition equations method

Lu, Junjun; Zhou, Huaichun

doi:10.1088/1674-1056/25/9/090203

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…TiO 2 was chosen for the moth-eye structure as it exhibits a low optical absorption and high real refractive index. [55] For large-scale manufacturing, it is feasible that the TiO 2 moth-eye is designed and arranged on the TCO layer. The colloidal lithography technology can be used to combine the TiO 2 moth-eye on the TCO layer.…”

Section: Methodsmentioning

confidence: 99%

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Full-Spectrum Solar Energy Utilization and Enhanced Solar Energy Harvesting via Photon Anti-Reflection and Scattering Performance Using Nanophotonic Structure

Liang¹,

Wang²,

Cheng³

et al. 2020

ES Energy Environ.

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Conventional Si photovoltaic cells cannot convert full solar energy spectrum (400~2 500 nm) into electricity owing to the mismatch between Si band gap and broad range of solar photon energies. Transparent silicon PV cell allows sunlight in the wavelength of 1 100~2 500 nm to transmit through itself and irradiate on the thermal absorber below. The traditional photon management method based on texturing silicon layer with nanostructures can enhance 400~1 100 nm absorptivity and 1 1002 500 nm transmittance of transparent silicon PV cell. However, an increase in charge carrier capture and a decrease in electricity generation efficiency are often observed with this. In this study, a novel spectral splitting method based on frontlocated wavelength-sized TiO 2 biomimetic moth-eye nanophotonic structure is put forward, which can inhibit the increase of charge carrier capture and recombination. The biomimetic moth-eye nanophotonic structure was optimized by using finitedifference time-domain (FDTD) method to achieve excellent photon anti-reflection and scattering properties. The calculation results indicated that the absorption factor and transmission factor of transparent silicon PV cell could be increased from 46% to 58% and from 11% to 14%; the relative power conversion efficiency enhancement rate and relative incident radiation power enhancement rate was 32% and 27% when the TiO 2 biomimetic moth-eye was adopted.

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Section: Methodsmentioning

confidence: 99%

“…The real (n) and imaginary (k) parts of the optical constants of TiO 2 , amorphous silicon, and AZO used in the FDTD calculations were taken from Ref. [55,60,61], and they are shown in Fig. 3.…”

Section: Model Validationmentioning

confidence: 99%

Full-Spectrum Solar Energy Utilization and Enhanced Solar Energy Harvesting via Photon Anti-Reflection and Scattering Performance Using Nanophotonic Structure

Liang¹,

Wang²,

Cheng³

et al. 2020

ES Energy Environ.

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“…The finite-difference time-domain (FDTD) method is a very popular time-domain algorithm in electromagnetics. [1,2] Nevertheless, due to the limitation of the Courant-Friedrich-Levy (CFL) condition, it is inefficient to deal with the electromagnetic problems of objects with multi-scale structures or fine structures. To break through the limitation of CFL condition, unconditionally stable FDTD (US-FDTD) methods have been proposed.…”

Section: Introductionmentioning

confidence: 99%

New hybrid FDTD algorithm for electromagnetic problem analysis*

Wei

Fan

et al. 2019

Chinese Phys. B

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Since the time step of the traditional finite-difference time-domain (FDTD) method is limited by the small grid size, it is inefficient when dealing with the electromagnetic problems of multi-scale structures. Therefore, the explicit and unconditionally stable FDTD (US-FDTD) approach has been developed to break through the limitation of Courant–Friedrich–Levy (CFL) condition. However, the eigenvalues and eigenvectors of the system matrix must be calculated before the time iteration in the explicit US-FDTD. Moreover, the eigenvalue decomposition is also time consuming, especially for complex electromagnetic problems in practical application. In addition, compared with the traditional FDTD method, the explicit US-FDTD method is more difficult to introduce the absorbing boundary and plane wave. To solve the drawbacks of the traditional FDTD and the explicit US-FDTD, a new hybrid FDTD algorithm is proposed in this paper. This combines the explicit US-FDTD with the traditional FDTD, which not only overcomes the limitation of CFL condition but also reduces the system matrix dimension, and introduces the plane wave and the perfectly matched layer (PML) absorption boundary conveniently. With the hybrid algorithm, the calculation of the eigenvalues is only required in the fine mesh region and adjacent coarse mesh region. Therefore, the calculation efficiency is greatly enhanced. Furthermore, the plane wave and the absorption boundary introduction of the traditional FDTD method can be directly utilized. Numerical results demonstrate the effectiveness, accuracy, stability, and convenience of this hybrid algorithm.

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“…A Drude model material was used to model the tunneling region in the gap. To estimate the accuracy, it is useful to quantify the level of convergence 28 ∫ ∫…”

mentioning

confidence: 99%

“…A Drude model material was used to model the tunneling region in the gap. To estimate the accuracy, it is useful to quantify the level of convergence where t NP,0 is the simulated transmission spectrum for the gold nanoparticle trapped in nanoslit with mesh size of 0.051 nm and t NP,i represents other mesh sizes. Figure shows plots of the near-field and the level of convergence for c2.…”

mentioning

confidence: 99%

Coulomb Blockade Plasmonic Switch

Xiang

Gordon

2017

Nano Lett.

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Tunnel resistance can be modulated with bias via the Coulomb blockade effect, which gives a highly nonlinear response current. Here we investigate the optical response of a metal-insulator-nanoparticle-insulator-metal structure and show switching of a plasmonic gap from insulator to conductor via Coulomb blockade. By introducing a sufficiently large charging energy in the tunnelling gap, the Coulomb blockade allows for a conductor (tunneling) to insulator (capacitor) transition. The tunnelling electrons can be delocalized over the nanocapacitor again when a high energy penalty is added with bias. We demonstrate that this has a huge impact on the plasmonic resonance of a 0.51 nm tunneling gap with ∼70% change in normalized optical loss. Because this structure has a tiny capacitance, there is potential to harness the effect for high-speed switching.

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Finite-difference time-domain modeling of curved material interfaces by using boundary condition equations method

Cited by 5 publications

References 36 publications

Full-Spectrum Solar Energy Utilization and Enhanced Solar Energy Harvesting via Photon Anti-Reflection and Scattering Performance Using Nanophotonic Structure

Full-Spectrum Solar Energy Utilization and Enhanced Solar Energy Harvesting via Photon Anti-Reflection and Scattering Performance Using Nanophotonic Structure

New hybrid FDTD algorithm for electromagnetic problem analysis*

Coulomb Blockade Plasmonic Switch

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