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.


Mid-IR transmission of a large-area 2D silicon photonic crystal slab

(full pdf)

L. Prodan, R. Hagen, P. Gross, R. Arts, R. Beigang, C. Fallnich, A. Schirmacher, L. Kuipers and K.-J. Boller
Journal of Physics D
vol.41 p135105 june 12, 2008

We investigate the spectral transmission of a large-area (10 * 10mm2) two-dimensional
silicon-based photonic crystal (PhC) slab waveguide, which was fabricated by a laser
interference lithography (LIL) using a silicon-on-insulator wafer. The slab carries a 1 μm
period square pattern of round holes in the 0.5 μm thick silicon top layer. Transmission was
recorded over the wavelength range from 1.1 to 2.4 μm, i.e. from the near-infrared
single-photon absorption edge of silicon to below the mid-infrared two-photon absorption
edge. Under normal incidence, we observe Fano and Fabry-Perot-type transmission
resonances, in agreement with predictions based on coupled wave analysis. To determine the
quality of the LIL fabrication process, the bandwidth of the transmission peaks is determined
from experimental data and compared with results of the finite-difference time-domain
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