Biomolecules and nanostructures
The Optical Sciences group studies the interaction of light and matter. Our current focus is on detection and sensing/imaging with an emphasis on the development of integrated photonics. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.
Cerenkov-type second-harmonic generation in thin planar calixarene waveguiding films(full pdf)
Noordman OFJ, vanHulst NF, Bolger B
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
vol 12 issue 12: p2398-p2405 DEC 1995
A new type of organic molecule, calixarene, is applied in a second-harmonic-generating waveguide device for the first time. Linear optical properties of the calixarene waveguiding film have been measured with the prism-coupling method. The molecules in the film are oriented by a corona-poling technique. With a Maker-fringe experiment, the induced d(33) and d(31) at lambda = 1064 nm are determined at 8.6 and 2.0 pm/V, respectively. The calixarene thin film has been applied to a Cerenkov-type device that generates second- harmonic light radiating into the glass substrate. The highest efficiency obtained is 0.23% for a fundamental wavelength of 820 nm by the use of fundamental power densities of 100 MW/cm(2) in the waveguide and a device length of 6 mm. A coupled-mode theory has been developed that can properly explain the experimentally observed second-harmonic-generating efficiency and the angle of radiation into the substrate. Two methods for the enhancement of device efficiency are proposed, both based on theoretical calculations with the coupled-mode theory. An enhancement of 2 orders of magnitude is feasible. (C) 1995 Optical Society of America