Ruth Jarvis

Fabrication and characterization of low loss rib chalcogenide waveguides made by dry etching

We report the fabrication and characterization of rib chalcogenide waveguides produced by dry etching with CF4 and O2. The high index contrast waveguides (Deltan ~1) show a minimum propagation loss of 0.25 dB/cm. The high refractive nonlinearity of 100 times silica in As2S3 allowed observation of a pi phase shift due to self-phase modulation of an 8 ps duration 1573 nm pulse in a 5 cm long waveguide.

Chalcogenide Glasses for All-optical Processing

Chalcogenide glasses, which contain S, Se or Te atoms combined with network forming elements such as Ge, As, Sb have the largest third order optical nonlinearity of any inorganic glass. As a result they are attractive candidates for fibre and waveguide devices for all-optical signal processing in the telecommunications bands. In this talk I will review our recent progress in all-optical devices such as regenerators, wavelength converters and other devices in chalcogenide glasses.

Wavelength dispersion of Verdet constant in Ge 22 As 20 Se 58 , Ge 33 As 12 Se 55 and As 2 S 3 chalcogenide thin films

The Verdet constants of amorphous thin films of chalcogenide glasses of three different compositions were determined across a range of wavelengths from the visible to the infrared. The Verdet constant of Ge₂₂As₂₀Se₅₈ was found to be 30 times greater than silica.

Optical characterization of Ge-As-Se glasses containing high content of germanium

Optical properties of chalcogenide glasses, Ge_xAs_ySe_100-x-y (33les x les39 and 12les y les16) were studied by using Raman, UV-vis-IR and PDS spectroscopic techniques, and the relationships between structure, composition and optical property were discussed.

Faraday rotation in amorphous chalcogenide films

We measured the wavelength dispersion of magneto-optic rotation in amorphous chalcogenide thin-films deposited by pulsed laser deposition. The largest rotation is achieved in films with high Germanium concentration being more than 25-times greater than silica.