الفهرس 
Chapter 1: IntroductionOnly 14 pages are availabe for public view
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Abstract
An optical communication system consists of many optical devices such as a transmitter,
coupler, receiver, optical fiber, sensors, multiplexer, and demultiplexer.
In this thesis, numerical simulations for different photonic applications in
communication are studied and analyzed through the finite element method to
investigate the performance and efficiency of different photonic sensor platforms as a
part of optical communication systems.
Firstly, a highly sensitive terahertz bilirubin sensor based on a photonic crystal fiber
platform is studied and analyzed. The confinement of the optical mode through the core
region has been studied to obtain a better performance. In addition, the performance
parameters such as effective mode area, birefringence, power fraction, and relative
sensitivity have been studied as a function of operating frequency and bilirubin
concentrations. Further, the loss parameters such as confinement loss, and effective
material loss have been studied to enhance the sensor efficiency. Moreover, the
parametric sweep optimization has been performed to maximize the sensor sensitivity.
The tolerance approach has been studied to take into consideration the fabrication
faults. The optimized sensitivity, effective mode area, confinement loss, and effective
material loss are 98%, 0.046 mm2
, 2.03×10-14 dB/cm, and 0.00193 cm-1
, respectively.
The second studied platform is the metamaterial structure in which a highly sensitive
triple-band metamaterial-based biosensor for different cancer cell detection is
suggested and numerically analyzed. The reported sensor has a polyimide dielectric
layer which is sandwiched between gold bottom plane and top metallic patches. The
analyte sample covers the metallic patch where multiple resonances occur with high
absorption. The resonance frequencies depend on the optical properties of the analyte
sample. Therefore, the proposed sensor can distinguish between different cancer cell
types such as skin cancer, blood cancer, and breast cancer. The Full vectorial finite element method is used to study the effects of the geometrical
parameters with the aim of maximizing the sensor sensitivity. The suggested sensor has
a high sensitivity of 2050 GHz/RIU with a high-quality factor of 55.34 in the frequency
range from 4.25 THz to 4.75 THz. Further, the proposed biosensor is a label-free, and
easy to fabricate using state-of-the-art fabrication technologies.