Photonic integrated circuit components with amorphous structures

Sarıhan, Murat Can
In this thesis work, amorphous photonic materials, which are an alternative to photonic crystals and offering flexibility and comparable performance, are designed for photonic integrated circuits and analyzed. A design guideline is presented for the first time with experimental verification in telecommunication wavelengths. Amorphous photonic materials are artificially designed materials that possessing random refractive index distributions and has photonic band gaps due to the inherent short-range order. For the amorphous photonic materials, a Monte Carlo method is proposed which is taking natural crystalline-amorphous semiconductor transitions as an example and the affecting design parameters are analyzed. The generated amorphous structures are analyzed numerically and experimentally for verification. Furthermore, the factors affecting band gap is scrutinized. The band gap asymmetry which is one of the basic properties of amorphous photonic materials are explained theoretically, with the help of electronic amorphous semiconductors.


Flexible waveguides with amorphous photonic materials
Sarihan, Murat Can; Yilmaz, Yildirim Batuhan; Erdil, Mertcan; Aras, Mehmet Sirin; Yanik, Cenk; Wong, Chee Wei; Kocaman, Serdar (2019-01-01)
Amorphous photonic materials offer an alternative to photonic crystals as a building block for photonic integrated circuits due to their shared short-range order. By using the inherent disorder of amorphous photonic materials, it is possible to design flexible-shaped waveguides that are free from restrictions of photonic crystals at various symmetry axes. Effects of disorder on photonic crystal waveguide boundaries have examined before, and it is shown that flexible waveguides with high transmission are pos...
Integrated optical modulators with zero index metamaterials based on photonic crystal slab waveguides
Yildirim, Mustafa; GÖVDELİ, ALPEREN; Kocaman, Serdar (2019-01-01)
A novel integrated optical modulator design is presented using zero index metamaterial-based Mach-Zehnder Interferometer with photonic crystal phase shifters. The phase modulation relies on the shift between the photonic bandgaps having non-zero and zero effective refractive indices. A small change in the bulk index results in an effective index change between the arms of the MZI due to the disturbance of the band structure. Thus, such a structure provides a new approach for phase modulation on integrated o...
Tunable integrated optical modulator with dynamical photonic band transition of photonic crystals
GÖVDELİ, ALPEREN; Kocaman, Serdar (2019-01-01)
A Mach-Zehnder Interferometer based optical modulator composed of photonic crystals as phase shifters is presented. The switching process relies on the phase modulation along the arms of interferometer resulted from the photonic band shift of the photonic crystal regions. A small bulk index change leads to a large effective index difference between two arms of the interferometer and a small foot-print device can operate as a modulator. Presented MZI-based optical modulator is shown to have tunable bandwidth...
Synthesis and characterization of bulk amorphous/nanocrystalline soft magnetic materials
Karataş, Mediha Merve; Akdeniz, Mahmut Vedat; Mekhrabov, Amdulla O.; Department of Metallurgical and Materials Engineering (2016)
The aim of the study is to reach non-equilibrium cooling conditions and produce bulk glassy (Fe36Co36B19.2Si4.8Nb4)99.25Cu0.75 rod which has a good soft magnetic property and high electrical resistivity and to investigate its crystallization kinetics. The bulk metallic glass formation was achieved by arc melting and suction casting and it was confirmed by scanning electron microscopy (SEM), x-ray diffraction (XRD) and thermal analysis techniques. After characterizations, by isochronal and isothermal differe...
Photonic Crystal and Plasmonic Silicon-Based Light Sources
Makarova, Maria; Gong, Yiyang; Cheng, Szu-Lin; Nishi, Yoshio; Yerci, Selçuk; Li, Rui; Dal Negro, Luca; Vuckovic, Jelena (2010-01-01)
Efficient silicon (Si)-compatible emitters can realize inexpensive light sources for a variety of applications. In this paper, we study both photonic crystal (PC) and plasmonic nanocavities that enhance the emission of Si-compatible materials. In particular, we examine the coupling of silicon nanocrystals (Si-NCs) to silicon nitride PC cavities and Si-NCs in silicon dioxide to plasmonic gratings, both for enhancement of emission in the visible wavelengths. In addition, we also observe the enhancement of the...
Citation Formats
M. C. Sarıhan, “Photonic integrated circuit components with amorphous structures,” M.S. - Master of Science, Middle East Technical University, 2018.