Laura Vogelaar

Large area photonic crystal slabs for visible light with waveguiding defect structures: Fabrication with focused ion beam assisted laser interference lithography

Extended photonic crystal slabs with light-guiding defects have been created by a combination of laser interference lithography (LIL) and local focused ion beam (FIB) assisted deposition. Large area, highly uniform photonic crystal slabs for visible light are thus made possible. The Figure shows a freestanding Si3N4-air photonic crystal with a light- guiding defect line running along the center of the slab (total length = 1 mm).

Poling of a channel waveguide

This paper describes thermal poling of a silica based channel waveguide Mach-Zehnder interferometer, and direct measurent of the dc-Kerr and induced electro-optic coefficients. A /(3) of 5.2 (+/-0.4) x 10-22 (m/V)2 was measured for the un-poled waveguide, and r-coefficient of approximately 0.07 pm/V was induced by poling. /(3) increased by a factor of 1.9 after poling. It is shown that the dc-Kerr effect plays an important role in the poled device.

Fabrication of photonic crystal slabs and defects using laser interference lithography and focused ion beam-assisted deposition

A method is described for fabricating photonic crystal slabs, using a combination of laser interference lithography for generating a regular periodic structure (the crystal lattice), and focused ion beam-assisted deposition for defining defects in this lattice, which may act as waveguides or resonators. As an example, results will be shown of a photonic crystal slab with a line defect in silicon nitride.