We have developed a temporal coupled-mode theory based on quasi-normal modes to investigate the chiroptical effects in parity-time (PT) symmetric metasurfaces. The PT sym-metry enforces a different constraint for the direct scattering matrix and the coupling constants, which is verified by cal-c...
In addition, owing to the C4 symmetry of the unit design, the metamaterial absorber exhibits polarization insensitivity. CuHT–FCIP–EP metamaterial demonstrates consistent and effective absorption performance in the transverse magnetic (TM) polarization mode across incident angles within 75°, with an ...
Results We start from investigating the acoustic supermode in an array of N coupled waveguides based on the coupled-mode theory, with only the nearest-neighbor coupling being considered31. The scalar wave equation for sound takes the form of ∇2p − 1 c2 ∂ 2p ∂t 2 = 0. As shown...
By using coupled mode theory and full-wave simulations, we show that an arbitrary order exceptional point can be achieved in a simple system consisting of dipolar resonators placed near a waveguide. Unidirectional coupling between any tw... S Wang,H Bo,W Lu,... 被引量: 0发表: 2018年 Exce...
[33]. Temporal coupled-mode theory (TCMT), serving as the foundational physics framework for describing light–matter interactions [22,29,45], has emerged as a promising approach to drive the design and optimization of nanoantennas. This method holds tremendous potential in advancing our ...
coupled mode theory,current approaches are not well equipped to capture the arbitrary spatial response observed in the nascent field of nonlocal metasurfaces.Here,we introduce spatio-temporal coupled mode theory(STCMT),capable of elegantly capturing the key features of the resonant response of wave...
Nonlocal metasurfaces with spatially varying geometries are modeled using a generalized coupled mode theory that operates in real space, enabling rapid numerical prototyping and insightful modeling of their spectro-spatial features.Light: Science & Applications...
However, in comparison to typical microresonators and planar metasurfaces, the finite length and nanoscale dimensions of the NW GSL cause a relatively low quality factor and wide bandwidth for the guided light. This difference highlights an inherent but common tradeoff in the design of optical ...
split ring resonator MTM. This gap coupling causes shifting in the resonances at 2.78 GHz, 7.7 GHz and 10.16 GHz with an increasing effective medium ratio. Thus, the proposed MTM provides triple-band resonances within C, S, X-bands. The S21response of the MTM for all design phases are ...
We derive a coupled-mode theory (CMT) formulation for the fast analysis of periodic multi-element metasurfaces in the presence of radiation losses. Full-wave simulations of periodic multi-element metasurfaces are very time- and memory-consuming, especially as the size and complexity of the ...