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We demonstrate soliton-induced waveguiding and orientational ordering in gold nanorod suspensions. Using a probe beam far away from plasmonic resonance, we observe orientation-enhanced birefringence along the soliton waveguide, indicating optically induced disorder-to-order transition of nanorods.
We study nonlinear light propagation through suspensions of Synechococcus cells. Such cyanobacteria in aqueous solution enable self-focusing and -defocusing of a light beam, leading to controlled transmission despite extremely low absorption and weak polarizability.
We design a new type of “tug-of-war” optical tweezers with lateral pulling forces and demonstrate full control of rod-shaped and asymmetric bacteria, including breaking up adhesive cellular clusters inhabiting aqueous media.
We fabricate honeycomb and related photonic lattices in a nonlinear crystal with a simple method that is based on the optical Fourier transformation through an amplitude mask (six-hole aperture) superimposed with a phase mask (three tilted glass plates). Compared with using the spatial light modulator, our method is cost-effective and easy to control for almost every one. Numerically, we use the transmittance...
We demonstrate the strongest effect of dark-soliton attraction in a new type of nonlocal thermal self-defocusing nonlinear media (m-cresol/nylon solutions). Formation of spatial shock waves is also observed with only mW power.
We demonstrate stable beam self-trapping in soft-matter systems with artificial saturable self-focusing nonlinearities. Our experiments reveal optical beam interactions that can vary from attractive to repulsive as well as an energy exchange.
Aqueous suspensions containing pure gold nanoparticles and silica-gold core-shells are shown to exhibit different polarizibilities, thus allowing self-trapping of long needles of light. The different nonlinear mechanisms behind these processes are investigated.
We report a new type of Kerr-like nonlinear media (m-cresol/nylon solutions) exhibiting a giant tunable self-defocusing nonlinearity. Their nonlinear response can be enhanced dramatically by increasing the nylon concentration and is verified to be isotropic.
We will provide a brief overview of our work on optical control of light beams in photonic lattices and of particles with nonconventional optical beams, including trapping and manipulation with propelling beams, bottle beams, and self-accelerating Airy beams
We show that high-intensity Airy pulses propagating in Kerr-type nonlinear media can preserve their self-accelerating features under appropriate conditions. By engineering the input pulses, controllable spectral shifting and reshaping are achieved.
We theoretically and experimentally demonstrate that transverse instability of soliton stripes can be greatly suppressed when the solitons propagate in a 1D lattice under self-defocusing nonlinearity.
We demonstrate for the first time stable self-trapping and self-induced transparency of light propagating in colloidal nano-suspensions with negative polarizabilities. Comparing to “polystyrene-water”-colloidal systems with positive polarizabilities, a fivefold increase in transmission ratio is achieved.
We present the observation of dispersion-free edge states in a honeycomb lattice. We show the existence of surface states on both zigzag and bearded edges, and display their dispersion-free nature by tilting the input beam
We demonstrate optical beam auto-focusing without the need of a focusing lens or nonlinearity. Radial Airy beams with inward and outward accelerations are used and an abrupt transition between Airy and Bessel behavior is observed.
We demonstrate an induction technique to generate honeycomb photonic lattices with equal and unequal sites in each unit-cell. We show light localization as nonlinear solitons and linear Shockley surface states in lattices with unequal sites.
We generate optical beams with rotating intensity blades, namely “optical propellers”, by employing Moiré technique. Such rotating beams are controlled by SLM without mechanical movement or phase-sensitive interference. Self-trapping of propelling beams is also demonstrated.
We describe and numerically demonstrate asymmetric coherent continuum generation in mid-infrared by a fundamental soliton propagating in non-uniform fiber taper via dispersive wave emission in a stabilized regime near continuously shifting second dispersion zero.
Linear guidance of dipole modes in an optically induced ring lattice with a low-refractive-index core is demonstrated both theoretically and experimentally. These dipoles are guided in the low-index region of the lattice. Such guidance results from anti-resonance or bandgaps in waveguides rather than the total internal reflection.
Localized linear modes due to bandgap guidance in two-dimensional photonic lattices with a repulsive defect are investigated theoretically. It is shown that the negative defect can not only guide fundamental modes, but also dipole modes and vortex modes.
Nonlinear defect-modes (defect-solitons) in optically-induced one-dimensional photonic lattices with a single-site repulsive defect are predicted and observed. These defect solitons bifurcate from linear defect modes and are fully stable.
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