title: Delay of light in an optical bottle resonator with nanoscale radius variation: dispersionless, broadband, and low loss.
abstract: It is shown theoretically that an optical bottle resonator with a nanoscale radius variation can perform a multinanosecond long dispersionless delay of light in a nanometer-order bandwidth with minimal losses. Experimentally, a 3 mm long resonator with a 2.8 nm deep semiparabolic radius variation is fabricated from a 19 μm radius silica fiber with a subangstrom precision. In excellent agreement with theory, the resonator exhibits the impedance-matched 2.58 ns (3 bytes) delay of 100 ps pulses with 0.44 dB/ns intrinsic loss. This is a miniature slow light delay line with the record large delay time, record small transmission loss, dispersion, and effective speed of light.
authors.affiliation: OFS Laboratories, 19 Schoolhouse Road, Somerset, New Jersey 08873, USA.
authors.forename: M
authors.initials: M
authors.lastname: Sumetsky