CiteULike: dhbradshaw's doppler-paper

Reversed Doppler Effect in Photonic Crystals

Evan Reed — 2008-01-08T20:49:06-00:00

Physical Review Letters, Vol. 91, No. 13. (2003), 133901.

Nonrelativistic reversed Doppler shifts have never been observed in nature and have only been speculated to occur in pathological systems with simultaneously negative effective permittivity and permeability. This Letter presents a different; new physical phenomenon that leads to a nonrelativistic reversed Doppler shift in light. It arises when light is reflected from a moving shock wave propagating through a photonic crystal. In addition to reflection of a single frequency; multiple discrete reflected frequencies or a 10 GHz periodic modulation can also be observed when a single carrier frequency of wavelength 1 μm is incident.

Observation of the Inverse Doppler Effect

N Seddon — 2008-01-08T20:27:02-00:00

Science, Vol. 302, No. 5650. (28 November 2003), pp. 1537-1540.

We report experimental observation of an inverse Doppler shift, in which the frequency of a wave is increased on reflection from a receding boundary. This counterintuitive effect has been produced by reflecting a wave from a moving discontinuity in an electrical transmission line. Doppler shifts produced by this system can be varied in a reproducible manner by electronic control of the transmission line and are typically five orders of magnitude greater than those produced by solid objects with kinematic velocities. Potential applications include the development of tunable and multifrequency radiation sources. 10.1126/science.1089342

Optomechanical Wavelength and Energy Conversion in High-Q Double-Layer Cavities of Photonic Crystal Slabs

Masaya Notomi — 2008-01-07T17:16:54-00:00

Physical Review Letters, Vol. 97, No. 2. (2006)

We demonstrate that ultrasmall double-layer photonic-crystal-slab cavities exhibit a very high-Q value for a wide range of the layer spacing, which enables us to realize unique optomechanical coupling. By mechanically varying the separation, we can achieve extraordinarily large wavelength conversion. In addition, the light stored in the cavity can generate a large radiation force. We show that this system exhibits extremely high energy conversion efficiency between optical and mechanical energy, leading to a novel approach for the optomechanical control of light and matter.

A near-field actuated optical nanocavity

Benoit Cluzell — 2008-01-03T20:52:05-00:00

Opt. Express, Vol. 16, No. 1. (7 January 2008), pp. 279-286.

We demonstrate here that switching and tuning of a nanocavity resonance can be achieved by approaching a sub-micrometer tip inside its evanescent near-field. The resonance energy is tuned over a wide spectral range (Δλ/λ~10 -3 ) without significant deterioration of the cavity peak-transmittance and of the resonance linewidth. Such a result is achieved by taking benefits from a weak tip-cavity interaction regime in which the tip behaves as a pure optical path length modulator.