Directly UV-written silica-on-silicon planar waveguides with low insertion loss

Directly UV written silica-on-silicon planar waveguides with low insertion loss

Serpentine low loss trapezoidal silica waveguides on silicon.

We report the fabrication and characterization of straight and serpentine low loss trapezoidal silica waveguides integrated on a silicon substrate. The waveguide channel was defined using a dual photo-lithography and buffered HF etching and isolated from the silicon substrate using an isotropic silicon etchant. The waveguide is air-clad and thus has a core-cladding effective index contrast of a...

Integrated Bragg Grating and Carbon Nanotube Devices Using UV-Written Silica-Based Planar Waveguides

Femtosecond laser written low-loss single-mode waveguides in PMMA

Ultrafast laser inscription is a standard technique to fabricate embedded waveguides in glasses or crystals. Tightly focused femtosecond laser-pulses induce an increase in refractive index inside the material via non-linear absorption. By moving the sample through the focus virtually arbitrary threedimensional paths can be created. The transfer of this technique to polymers has already delivere...

Recent Developments in Direct-UV-Written Planar Waveguides, Gratings, Sensors, and Substrates

We present our recent developments in direct-UV-written integrated optical devices, based on applications in telecommunications, material characterisation, and optical sensing. The inherent advantages of this channel definition technique over traditional etching based approaches are reiterated and demonstrated in the production of small angle, low loss X-couplers with negligible polarisation de...