Dr. F. Causa
Department of Electronic and Electrical Engineering
University of Bath MMT Proposed Projects
Title: 
DEVELOPMENT OF A COMPUTER PROGRAM TO COMPUTE THE MODES OF A MULTILAYER DIELECTRIC SLAB WAVEGUIDE

Description: 
The aim of this project is to develop a userfriendly computer program to calculate the bound modes of a slab dielectric waveguide. Computation of the modal properties of ideal (with no loss) dielectric (multilayer) slab waveguides is relatively straightforward and entails solving the wave equation in each layer and applying the appropriate boundary conditions to find the requested solutions. Timeharmonic optical electromagnetic fields will be considered. The output of the program will be the near and far field characteristics of the modes of a given waveguide. There is interest in the possibility of extending the calculations to include the computation of all vector components of the electromagnetic field of the waveguide modes. Time permitting, there could be the possibility of comparing theoretically predicted near and far field intensity profiles with those measured experimentally from semiconductor waveguides and/or lasers.

Outcome: 
At the end of the project, the student should have become familiar with the theory of optical waveguides, developed a userfriendly computer program to calculate the modes of slab dielectric waveguides and, time permitting, gained familiarity with experimental techniques to characterise the optical beam of semiconductor lasers.

Resources: 
PC and/or access to network for modelling. Time permitting, equipment in Optoelectronics Laboratory 2E3.25

Project 2
Title: 
DEVELOPMENT OF A COMPUTER PROGRAM TO SIMULATE THE OPERATIONAL CHARACTERISTICS OF semiconductor LASER ARRAYS

Description: 
Recently there has been increasing interest in developing high power semiconductor sources for applications including, for example, optical pumping, freespace communications and material processing. One way of achieving high output optical power is to operate many semiconductor lasers in an array. The aim of this project is to develop a computer program to study the operational characteristics of arrays of semiconductor lasers. Time permitting there could be the possibility of experimentally characterise inhouse fabricated laser arrays.

Output: 
At the end of the project the student should have become familiar with the basic principles of operation of semiconductor lasers, developed a user friendly computer program to study laser arrays and, time permitting, gained familiarity with experimental techniques to characterise semiconductor laser arrays.

Resources: 
PC and/or access to network for modelling. Equipment in the Optoelectronics Laboratory 2E 3.25.

Project 3
Title: 
DEVELOPMENT OF A COMPUTER PROGRAM TO COMPUTE THE MODES OF THREELAYER, SLAB OPTICAL WAVEGUIDES WITH LOSS OR GAIN

Description: 
The aim of this project is to develop a userfriendly computer program to calculate the bound modes of a slab dielectric waveguide with complex dielectric profile. Computation of the modal properties of ideal (with no loss) dielectric (multilayer) slab waveguides is relatively straightforward. However, to compute the (bound) modes of slab waveguides with loss or gain requires considerable effort. For timeharmonic optical electromagnetic fields, a dielectric with loss/gain may be mathematically represented as a medium with complex dielectric profile. The interest in this project is to generate a computer program to solve for the modes supported by slab dielectric waveguides that present gain/loss. Further it will be useful to complete a thorough review on the complete set of solutions supported by this category of waveguides. Time permitting there will be the possibility of extending the calculations to include the computation of all vector components of the electromagnetic field of the waveguide modes. Another interesting aspect that can be studied refers to complex modal solutions (i.e., those characterised by a complex effective refractive index) obtained for a medium with purely real dielectric distribution in order to fully appreciate the complete set of mathematical solutions of the wave equation for dielectric waveguides.

Outcome: 
At the end of the project, the student should have become familiar with the theory of optical waveguides, developed a userfriendly computer program to calculate the modes of slab dielectric waveguides with complex dielectric profile and (time permitting) all corresponding vector components.

Resources: 
PC and/or access to network for modelling. Time permitting, equipment in Optoelectronics Laboratory 2E3.25

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