Optical Sciences

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.


Low-loss sharp bends in polymer waveguides enabled by the introduction of a thin metal layer

(full pdf)

Mustafa Akin Sefunc, Markus Pollnau, and Sonia M. García-Blanco
Optics Express
Vol. 21 Issue 24, p. 29808-29817 nov. 25 2013

Embodying a thin metallic layer underneath the core of a sharply bent polymer waveguide is shown in this work to considerably reduce the total losses of both the quasi-transverse-electric and quasi-transverse-magnetic modes. The computational results show a total loss as low as ~0.02 dB/90° for the quasi-transverse-electric mode for radii between 6 and 13 μm at the wavelength of 1.55 μm, which corresponds to a 10-fold improvement over the purely dielectric counterpart. The radii range exhibiting such low total loss can be tuned by properly selecting the parameters of the structure. For the quasi-transverse-magnetic mode, the metal layer reduces the total losses modestly for radii ranging from 3 to 10 μm. Simulation results for different structural parameters are presented. © 2013 Optical Society of America
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