Flexible waveguides with amorphous photonic materials

Sarihan, Murat Can
Yilmaz, Yildirim Batuhan
Erdil, Mertcan
Aras, Mehmet Sirin
Yanik, Cenk
Wong, Chee Wei
Kocaman, Serdar
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 possible by forming a wall of equidistant scatterers around the defect created inside amorphous material configuration. Based on this principle, waveguides with various flexible shapes are designed and fabricated for planar circuit applications. A silicon-on-insulator (SOI) slab with random configuration of air hole scatterers is used. The amorphous configuration is generated through realistic Monte Carlo simulations mimicking crystalline-to-amorphous transition of semiconductor crystals via an assigned Yukawa potential to individual particles. The design parameters such as average hole distance, slab thickness and hole radius are adjusted so that the waveguide is utilizable around 1550 nm telecommunications wavelength. Such waveguides on slab structures are characterized here and the level of randomness and band gap properties of amorphous configurations are analyzed in detail. These efforts have the potential to lead easier design of a wide range of components including but not limited to on-chip Mach-Zehnder interferometers, splitters, and Y-branches.


Integrated optical modulators based on photonic crystals
Gövdeli, Alperen; Kocaman, Serdar; Department of Electrical and Electronics Engineering (2018)
Photonic Crystals, artificial optical structures making manipulation of the light possible, have become a popular platform since their first development. Here, such optical components are studied theoretically and their unusual behaviors are utilized for integrated optics components. In particular, ability to change the effective index contribution of photonic crystals is exploited for the design of a low-voltage and area efficient integrated optical modulator. Variety of different aspects are compared betw...
Photonic integrated circuit components with amorphous structures
Sarıhan, Murat Can; Kocaman, Serdar; Department of Electrical and Electronics Engineering (2018)
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. F...
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The nematic-smectic A tricritical phase transition has been studied in binary mixtures of liquid crystals. By making the analogy between the "quasi-binary" fluid mixture and binary mixture of liquid crystals, we adapt the thermodynamic model for fluid mixtures due to Griffiths to the case of mixtures of liquid crystals.
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...
Erbium doped silicon photonic crystals for light sources and amplifiers
Vuckovic, Jelena; Makarova, Maria; Gong, Yiyang; Yerci, Selçuk; Li, Rui; Negro, Luca Dal (null; 2009-01-01)
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Citation Formats
M. C. Sarihan et al., “Flexible waveguides with amorphous photonic materials,” 2019, vol. 10914, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36404.