@article{article_337281, title={Coupler, beam splitter and Sensor designs by using the properties of surface modes in photonic crystals}, journal={Sakarya University Journal of Science}, volume={21}, pages={1245–1253}, year={2017}, DOI={10.16984/saufenbilder.337281}, author={Bağcı, Fulya and Çapraz, Öznur and Akaoğlu, Barış}, keywords={Surface corrugated photonic crystals,surface mode,photonic crystal waveguide,focuser,beam splitter,sensor}, abstract={<p class="Abstract">In this study, coupling properties of electromagnetic waves
from air medium to waveguide are improved by creating surface corrugation in
silicon photonic crystals and a focuser, 1×2 and 1×3 beam splitters are
designed by examining beam scattering properties from photonic crystal
waveguide exit to air. When a surface layer and a diffraction grating layer
consisting of silicon rods are added to the input surface of photonic crystals,
it has been observed that, the surface mode coupling efficiency of
electromagnetic waves increases. It has been obtained that when radius
variation and point defects are formed in the silicon rods surrounding the
waveguide at the exit surface of the photonic crystal waveguide,
electromagnetic waves can be focused or scattered at equal powers. For the
first time by this study a decrease in the insensity of unwanted side lobes has
been detected when radial change is gradually established. In addition, studies
regarding a refractive index sensor have been carried out by creating a change
in the refraction index at the rods located in a certain periodicity at the
exit surface of the photonic crystal waveguide. </p> <p> </p> <p> </p>}, number={6}, publisher={Sakarya University}