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Title: Optical modulators and biochemical sensors based on low-symmetric nanophotonic structures with interferometric configurations
Authors: Yasa, Utku Görkem
Giden, İbrahim Halil
Kurt, Hamza
Keywords: Photonic crystals
rotational symmetry
low-symmetric structures
Issue Date: Feb-2018
Publisher: SPIE
Source: Yasa, U. G., Giden, I. H. and Kurt, H. (2018, February). Optical modulators and biochemical sensors based on low-symmetric nanophotonic structures with interferometric configurations. In Photonic and Phononic Properties of Engineered Nanostructures VIII (Vol. 10541, p. 105411Q). International Society for Optics and Photonics.
Abstract: Low-symmetric photonic crystals (PCs) have a high level of tunability in terms of their iso-frequency contours or refractive indices via angular orientations as well as spatial variations of unit cell elements. This phenomenon brings along emerging extraordinary dispersion properties dependent to rotation and position of unit cells. In this study, we show that the electromagnetic waves propagating inside the low-symmetric waveguides can be exposed to phase delays by tuning the angular orientations of unit elements. In this way, low-symmetric PC waveguides based Mach-Zehnder Interferometers (MZIs) exhibiting controllable phase properties are designed. The investigated all-dielectric tunable interferometric systems are numerically analyzed in both frequency and time domains. Furthermore, by exploiting spectral sensitivity of proposed MZIs, conceptual demonstration of gas sensor systems is performed. The designed optical gas sensors have minimum selectivity of 200 nm/RIU even in the case of refractive index variation on the order of 10-4 RIU in analytes. Having these advantages, proposed interferometric configurations based on low-symmetric periodic structures may offer a significant alternative for photonic applications that require controllable output power or sensing of gaseous substances.
ISBN: 978-151061567-0
ISSN: 0277-786X
Appears in Collections:Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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