Comparative study between the results of effective index based matrix method and characterization of fabricated SU-8 waveguide

Samanta, S. , Dey, P. K., Banerji, P. and Ganguly, P. (2017) Comparative study between the results of effective index based matrix method and characterization of fabricated SU-8 waveguide. Optics Communications, 382, pp. 632-638. (doi: 10.1016/j.optcom.2016.08.052)

Full text not currently available from Enlighten.

Abstract

A study regarding the validity of effective-index based matrix method (EIMM) for the fabricated SU-8 channel waveguides is reported. The design method is extremely fast compared to other existing numerical techniques, such as, BPM and FDTD. In EIMM, the effective index method was applied in depth direction of the waveguide and the resulted lateral index profile was analyzed by a transfer matrix method. By EIMM one can compute the guided mode propagation constants and mode profiles for each mode for any dimensions of the waveguides. The technique may also be used to design single mode waveguide. SU-8 waveguide fabrication was carried out by continuous-wave direct laser writing process at 375 nm wavelength. The measured propagation losses of these wire waveguides having air and PDMS as superstrates were 0.51 dB/mm and 0.3 dB/mm respectively. The number of guided modes, obtained theoretically as well as experimentally, for air-cladded waveguide was much more than that of PDMS-cladded waveguide. We were able to excite the isolated fundamental mode for the later by precise fiber positioning, and mode image was recorded. The mode profiles, mode indices, and refractive index profiles were extracted from this mode image of the fundamental mode which matched remarkably well with the theoretical predictions.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Samanta, Dr Swagata
Authors: Samanta, S., Dey, P. K., Banerji, P., and Ganguly, P.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Optics Communications
Publisher:Elsevier
ISSN:0030-4018
ISSN (Online):1873-0310
Published Online:27 August 2016

University Staff: Request a correction | Enlighten Editors: Update this record