379 citations · 1.8k across the 11 of their papers we have counts for
11 papers
Observation of acoustic spin
Chengzhi Shi, Rongkuo Zhao, Yang Long +5
Unlike optical waves, acoustic waves in fluids are described by scalar pressure fields, and therefore are considered spinless. Here, we demonstrate experimentally the existence of…
Harvesting Light with Transformation Optics
Yu Luo, Rongkuo Zhao, Antonio I. Fernandez-Dominguez +2
Transformation optics (TO) is a new tool for controlling electromagnetic fields. In the context of metamaterial technology, it provides a direct link between a desired electromagne…
Rotational Quantum Friction
Rongkuo Zhao, Alejandro Manjavacas, F. Javier García de Abajo +1
We investigate the frictional forces due to quantum fluctuations acting on a small sphere rotating near a surface. At zero temperature, we find the frictional force near a surface…
Optical forces in nanowire pairs and metamaterials
Rongkuo Zhao, Philippe Tassin, Thomas Koschny +1
We study the optical force arising when isolated gold nanowire pairs and metamaterials with a gold nanowire pair in the unit cell are illuminated with laser radiation. Firstly, we…
Repulsive Casimir forces with finite-thickness slabs
R. Zhao, Th. Koschny, E. N. Economou +1
We use the extended Lifshitz theory to study the behaviors of the Casimir forces between finite-thickness effective medium slabs. We first study the interaction between a semi-infi…
Chiral metamaterials with negative refractive index based on four "U" split ring resonators
Zhaofeng Li, Rongkuo Zhao, Thomas Koschny +5
A uniaxial chiral metamaterial is constructed by double-layered four "U" split ring resonators mutually twisted by 90 degrees. It shows a giant optical activity and circular dichro…
Chiral metamaterials: retrieval of the effective parameters with and without substrate
Rongkuo Zhao, Thomas Koschny, Costas M. Soukoulis
After the prediction that strong enough optical activity may result in negative refraction and negative reflection, more and more artificial chiral metamaterials were designed and…
Conjugated gammadion chiral metamaterial with uniaxial optical activity and negative refractive index
R. Zhao, L. Zhang, J. Zhou +2
We demonstrate numerically and experimentally a conjugated gammadion chiral metamaterial that uniaxially exhibits huge optical activity and circular dichroism, and gives a negative…
Microstructure Effects for Casimir Forces in Chiral Metamaterials
Alexander P. McCauley, Rongkuo Zhao, M. T. Homer Reid +7
We examine a recent prediction for the chirality-dependence of the Casimir force in chiral metamaterials by numerical computation of the forces between the exact microstructures, r…
Twisted split-ring-resonator photonic metamaterial with huge optical activity
M. Decker, R. Zhao, C. M. Soukoulis +2
Coupled split-ring-resonator metamaterials have previously been shown to exhibit large coupling effects, which are a prerequisite for obtaining large effective optical activity. By…
Repulsive Casimir Force in Chiral Metamaterials
R. Zhao, J. Zhou, Th. Koschny +2
We demonstrate theoretically that one can obtain repulsive Casimir forces and stable nanolevitations by using chiral metamaterials. By extending the Lifshitz theory to treat chiral…