title: Extraordinarily Large Optical Cross Section for Localized Single Nanoresonator.
abstract: Using an optical nanoresonator to realize extreme concentration of light at subwavelength nanoscale dimensions is of both fundamental and practical significance. Unfortunately, the optical cross section of an isotropic nanoresonator is determined by the resonant wavelength, which unfavorably limits the highest concentration ratio. Here we show that the cross section of a localized subwavelength resonator can be drastically enhanced by orders of magnitude. A single microscopic nanoresonator could exhibit a macroscopic optical cross section. We further show that the enhancement can be implemented in simple dielectric structures that are readily compatible with optoelectronic integration. The giant optical cross section of a nano-object provides a versatile platform to create extremely strong light-matter interactions at the nanoscale.
authors.affiliation: Department of Electrical and Computer Engineering, University of Wisconsin, Madison, Wisconsin 53706, U.S.A.
authors.forename: Ming
authors.initials: M
authors.lastname: Zhou
authors.affiliation: Department of Physics, Key Laboratory of Micro-and Nano-Photonic Structures (MOE), and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China.|Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Shi
authors.affiliation: Department of Physics, Key Laboratory of Micro-and Nano-Photonic Structures (MOE), and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China.|Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zi
authors.affiliation: Department of Electrical and Computer Engineering, University of Wisconsin, Madison, Wisconsin 53706, U.S.A.
authors.forename: Zongfu
authors.initials: Z
authors.lastname: Yu