We proposed a simple asymmetric rectangular band-stop filter based on metal–insulator–metal plasmonic waveguides. It is shown that the performance of the structure as a filter strongly depends on the asymmetry of the rectangular structure. An analytical model based on the analogy between MDM waveguides and the microwave transmission line is used to calculate the resonance wavelengths and explain the behavior of the filter. The bandwidth of spectra can be easily manipulated by adjusting the topological parameters of the filter. It is also demonstrated that by adjusting the bandwidth, the filter can be used for CWDM standard channels. The filter behavior is verified using the numerical finite difference time domain (FDTD) method. The filter is compact and has a footprint of 1 μm × 0.5 μm, which is suitable for integrated optical circuits.
We introduce highly compact resonant-cavity-enhanced magneto-optical switches for metal-dielectric-metal (MDM) plasmonic waveguides. The field profile of the fundamental mode of a MDM waveguide in which the metal is subject to an externally applied static magnetic field is asymmetric. The static magnetic field induced asymmetry, which enhances or reduces the coupling between the waveguide and a side-coupled resonator, and the relatively large induced wave vector modulation are used to design a Fabry-Perot cavity magneto-optical switch, consisting of a MDM waveguide side-coupled to two MDM stub resonators. The on and off states correspond to either the presence or the absence of the externally applied static magnetic field.
We introduce compact tunable spatial mode converters between the even and odd modes of graphene parallel plate (GPP) waveguides. The converters are reciprocal and are based on spatial modulation of graphene's conductivity. We show that the wavelength of operation of the mode converters can be tuned in the mid-infrared wavelength range by adjusting the chemical potential of a strip on one of the graphene layers of the GPP waveguides. We also introduce optical diodes for GPP waveguides based on a spatial mode converter and a coupler, which consists of a single layer of graphene placed in the middle between the two plates of two GPP waveguides. We find that for both the spatial mode converter and the optical diode the device functionality is preserved in the presence of loss.
for the continuous support of my thesis. I would like to thank Dr. Georgios Veronis for his comments, patience, motivation, and immense knowledge. His guidance and attention to detail helped me in all the time of research and this thesis could not have been written without his supervision. I am truly indebted to Jon for his meticulous comments and encouragements, as well as his innovative approach to develop and widen my research from various perspectives. Not only a great mentor, he has been a true father whose kindness will forever be of immense value to me. I could not have imagined having better advisors and mentors for my M.Sc. study than Dr. Georgios Veronis and Dr. Jonathan P. Dowling. My sincere thanks also go to Dr. Theda Daniels-Race for her insightful comments and suggestions to improve the quality of my research. Last but not the least, I would like to thank my lovely husband for supporting me spiritually throughout my study and my life in general. Without a doubt, this accomplishment would have never been possible without his continuous support, unconditional love, and prayers. iv
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