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Strong in-plane confinement of acoustic phonons in air-glass PCFs with sub-wavelength-scale cores is shown to result in an acoustic mode cut-off frequency, which acts like a Raman resonance. Spontaneous and photoacoustic measurements illustrate the effect.
We demonstrate experimentally all-optical beam steering in modulated photonic lattices produced by three wave interference in photorefractive crystals. We show that high spatial resolution can be achieved by combining dynamic beam steering with nonlinear self-localization.
We report a set of experimental observations of EIT in different pressure regimes throughout a ro-vibrational overtone-band of acetylene. An analysis of the contribution of both pressure-broadening and the fiber-core-wall on the coherence is given.
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