title: Radially graded index whispering gallery mode resonator for penetration enhancement.
abstract: This paper theoretically analyzes a hollow cylindrical whispering gallery mode resonator with radially inhomogeneous cladding. We propose an index profile of n(r) = b/r to enhance field penetration towards the resonator core. With such index profile, externally coupled evanescent wave can easily penetrate the resonator cladding without any potential barrier.
authors.affiliation: Singapore Institute of Manufacturing Technology, Singapore.
authors.forename: Di
authors.initials: D
authors.lastname: Zhu
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Zhou
authors.forename: Xia
authors.initials: X
authors.lastname: Yu
authors.forename: Ping
authors.initials: P
authors.lastname: Shum
authors.forename: Feng
authors.initials: F
authors.lastname: Luan
mesh_terms: D004867:Equipment Design; D006801:Humans; D008962:Models, Theoretical; D012031:Refractometry / Q000295:instrumentation*; D012666:Semiconductors