title: Terahertz tuning of whispering gallery modes in a PDMS stand-alone, stretchable microsphere.
abstract: We report on tuning the optical whispering gallery modes (WGMs) in a poly dimethyl siloxane-based (PDMS) microsphere resonator by more than 1 THz. The PDMS microsphere system consists of a solid spherical resonator directly formed with double stems on either side. The stems act like tie-rods for simple mechanical stretching of the microresonator, resulting in tuning of the WGMs by one free spectral range. Further investigations demonstrate that the WGM shift has a higher sensitivity (0.13 nm/μN) to an applied force when the resonator is in its maximally stretched state compared to its relaxed state.
authors.affiliation: Physics Department, University College Cork, Cork, Ireland. ramgopal.madugani@oist.jp
authors.forename: Ramgopal
authors.initials: R
authors.lastname: Madugani
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Ward
authors.forename: John Daniel
authors.initials: JD
authors.lastname: Riordan
authors.forename: Sara
authors.initials: S
authors.lastname: Coppola
authors.forename: Veronica
authors.initials: V
authors.lastname: Vespini
authors.forename: Simonetta
authors.initials: S
authors.lastname: Grilli
authors.forename: Andrea
authors.initials: A
authors.lastname: Finizio
authors.forename: Pietro
authors.initials: P
authors.lastname: Ferraro
authors.forename: Síle
authors.initials: S
authors.lastname: Nic Chormaic
mesh_terms: D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D007834:Lasers; D055595:Mechanical Phenomena; D008863:Microspheres; D055620:Optical Phenomena
chemical_list: D004129:Dimethylpolysiloxanes; C013830:baysilon