Genwang Cai

TL;DR: A broad-band perfect absorber composing a two-dimensional periodic metal-dielectric-metal sandwiches array on dielectric/metal substrate is designed and numerically investigated and it is shown that the nearly-perfect absorption can be achieved by overlapping of two plasmon resonances.

TL;DR: In this article, a dual-band perfect absorber involving an array of gold nanoellipsoids or nanoellipssoid dimers near a gold film is designed and their resonance absorptions and field enhancements are numerically investigated.

TL;DR: In this paper, the optical properties of asymmetric ring structures were investigated theoretically by using the discrete dipole approximation method, and the numerical results revealed that this kind of structure can achieve a giant localized field enhancement (LFE, 264) and a high LSPR sensitivity (corresponding FOM, 8.28) in the visible spectrum by Fano resonance, whose origin is discussed based on plasmon hybridization theory.

TL;DR: In this article, the optical cross sections of the reduced symmetry core-shell nanoparticle with different levels of gain were determined to determine the gain threshold of the asymmetric nanoparticle-based spaser fueled by different plasmon modes.

TL;DR: In this paper, the authors investigated the effect of asymmetric double split rings (ADSRs) on the frequency tunability and field distribution characters and showed that the dipole-multipole bonding resonances in the two arcs give rise to larger field enhancements and more hotspots than the anti-bonding ones in the gap regions.