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Crystals KTiOPO4 and KTiOAsO4 are used in terahertz parametric oscillators. The transverse optical A1 mode associated with the stimulated polariton scattering for KTiOPO4 is 268.5 cm−1. The intermittently tunable THz wave from 3.17 THz to 6.13 THz is obtained. For KTiOAsO4, the transverse optical A1 mode is 233.8 cm−1 and the intermittently tunable range is from 3.59 THz to 6.43 THz. The appearance...
We examine the influence of disorder over millimeter lengthscales, in the transport of photons. Super-collimation is achieved for varying controlled degrees of disorder in large-scale measurements, supported by physical theory and simulations.
We present measurements and modeling of collimating surface states in slow-light photonic crystal superlattices consisting of alternating dispersive and homogeneous media. Superlattice periodicity allows evanescent-wave resonant coupling to surface photon bound states, supporting collimation.
A photonic crystal substrate exhibiting resonant enhancement of multiple fluorophores has been demonstrated. The device, fabricated uniformly from plastic materials over a ~3×5 in2 surface area by nanoreplica molding, utilizes two distinct resonant modes to enhance electric field stimulation of a dye excited by a λ = 632.8 nm laser (cyanine-5) and a dye excited by a λ...
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