Reyhaneh Jannesari, Gerald Pühringer, Thomas Grille, Bernhard Jakoby,
"Design and Analysis of a Slot Photonic Crystal Waveguide for Highly Sensitive Evanescent Field Absorption Sensing in Fluids"
, in Micromachines, Vol. 11, Nummer 8, Seite(n) 781, 8-2020, ISSN: 2072-666X
Original Titel:
Design and Analysis of a Slot Photonic Crystal Waveguide for Highly Sensitive Evanescent Field Absorption Sensing in Fluids
Sprache des Titels:
Englisch
Original Kurzfassung:
The design and modeling of a highly sensitive sensor based on a slot photonic crystal
waveguide (slot-PCWG) is presented. The structure consists of cylindrical air rods drilled in a
dielectric slab on a triangular lattice, which are filled with SiO2. The waveguide is formed by
removing elements from the regular photonic crystal grid in a row, and embedding a slot in the center
position. This concept allows for a vast enhancement of the evanescent field ratio, leading to a strong
overlap between the field of the waveguide mode and the analyte. In the present work, we show that
the sensitivity at the constant slab thickness of the slot-PCWG modes is greatly enhanced, up to a
factor of 7.6 compared with the corresponding PCWG modes or Si-slab WGs. The finite-difference
time-domain (FDTD) technique and plane wave expansion (PWE) methods were used to study the
dispersion and profile of the PCWG mode. The simulation results show the potential of this design,
which will be fabricated and tested in the following steps of the project.