title: Single-particle to single-particle transformation of an active type organic μ-tubular homo-structure photonic resonator into a passive type hetero-structure resonator.
abstract: Self-assembled hexagonal organic submicrotubes, upon electronic excitation with an UV laser, display an active type polarized whispering gallery mode (WGM) resonance in the visible (Vis) range (400-600 nm). Due to the photonic cavity effect the tubes show fluorescence (FL) signal intensity 5× greater than the corresponding powder state. Furthermore, the same tubes, which are passive to a visible laser, produce yellow-orange emitting carbonaceous lumps when burnt with an intense laser beam (42 mW) forming a chemically binary heterogeneous structure. The hetero-structure upon excitation with a visible laser at the passive tubular part showed emission in the Vis-Near infrared (NIR) range (500-800 nm) with WGMs thus producing a passive/active type hetero-structure photonic resonator.
authors.affiliation: Functional Molecular Nano/Micro Solids Laboratory School of Chemistry, University of Hyderabad, Gachibowli, Hyderabad 500046, India. r.chandrasekar@uohyd.ac.in.
authors.forename: Uppari
authors.initials: U
authors.lastname: Venkataramudu
authors.forename: Dasari
authors.initials: D
authors.lastname: Venkatakrishnarao
authors.forename: Naisa
authors.initials: N
authors.lastname: Chandrasekhar
authors.forename: Mahamad Ahamad
authors.initials: MA
authors.lastname: Mohiddon
authors.forename: Rajadurai
authors.initials: R
authors.lastname: Chandrasekar