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We review the basic principles of the femtosecond laser direct writing approach. This technology opens the possibility to specifically tune the light evolution in the linear as well as in the nonlinear regime.
Optical microcavites fabricated by etching whispering gallery mode and photonic crystal structures in a high-index gallium phosphide layer and an underlying single-crystal diamond substrate are studied experimentally and theoretically.
A simple chemical method for reducing free-carrier lifetime in silicon photonics while maintaining low optical loss is presented. Lifetimes of ~ 300 ps for optical losses of ~ 0.4 cm-1 are achieved. Ramifications for nonlinear optics are discussed.
We propose a technique for sub-diffractional focusing in the far field of optical elements. The method combines subwavelength analogs of Fresnel lenses and planar anisotropic metamaterials, used to generate and propagate sub-diffractional information, respectively.
We use Bessel beam optical traps to self-position arrays of microsphere objectives near surfaces. Pulsed laser illumination of these objectives is used to perform near-field direct-write subwavelength optical nanopatterning with 100 nm feature sizes.
A new design mitigates multimode waveguide behavior in an optofluidic platform and increases fundamental mode coupling to 95%. Experimental results yield excellent agreement with simulations and demonstrate a suitable device for optical particle manipulation.
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