Tatevik Chalyan

Tatevik Chalyan
Vrije Universiteit Brussel | VUB

PhD

About

17
Publications
3,115
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268
Citations
Introduction
Tatevik Chalyan currently works at the Department of Physics, Unitersity of Trento. Tatevik does research in Silicon Photonics. Biophysics, Optics and Analytical Chemistry. Their current project is 'SYMPHONY '.
Additional affiliations
November 2014 - December 2015
Università degli Studi di Trento
Position
  • PhD Student

Publications

Publications (17)
Article
Full-text available
Due to its physical, chemical, and structural properties, oakwood is widely used in the production of barrels for wine ageing. When in contact with the wine, oak continuously releases aromatic compounds such as lignin, tannin, and cellulose to the liquid. Due to the release process, oak loses its characteristic aromatic compounds in time; hence, th...
Article
Full-text available
Aflatoxins (AF) are naturally occurring mycotoxins, produced by many species of Aspergillus. Among aflatoxins, Aflatoxin M1 (AFM1) is one of the most frequent and dangerous for human health. The acceptable maximum level of AFM1 in milk according to EU regulation is 50 ppt, equivalent to 152 pM, and 25 ppt, equivalent to 76 pM, for adults and infant...
Article
In this work, we present a closed-form model of silicon-on-insulator (SOI) micro-ring resonators, based on the conformal transformation method. We compute the propagation characteristics of the whispering gallery modes at resonance wavelengths. The results of the proposed model are compared to numerical simulations based on the finite element metho...
Conference Paper
Integrated optical (IO) biosensors based on Mach-Zehnder Interferometers or microring resonators are widely used for food and drug monitoring and protein studies thanks to their properties such as high intrinsic sensitivity, easy integration, miniaturization, and low cost1,2. In this study, we present a system to perform antibody interaction analys...
Conference Paper
In this work we present a new analytical formulation of silicon microring resonators and compare it with FDTD modelling and experimental results measured in a microring with a radius of 7μm, laterally coupled to a straight waveguide. The analytical modelling is based on the Conformal Transformation Method (CTM) and computes the propagation characte...
Article
Silicon oxynitride (SiON) microring resonators are used to develop a biosensor device to detect Aflatoxin M1, a carcinogenic mycotoxin present in milk. Two different surface functionalization strategies are tested to realize an affinity biosensing device. Both strategies are based on the formation of a silane surface layer able to bind either speci...
Article
Silicon Photonics is the technological to face the future challenges in data communications and processing. This technology follows the same paradigm as the technological revolution of the integrated circuit industry, that is, the miniaturization and the standardization. One of the most important building blocks in Silicon Photonics is the microres...
Conference Paper
In this work, we present a study on photonic biosensors based on Si3N4 asymmetric Mach-Zehnder Interferometers (aMZI) for Aflatoxin M1 (AFM1) detection. AFM1 is an hepatotoxic and a carcinogenic toxin present in milk. The biosensor is based on an array of four Si3N4 aMZI that are optimized for 850nm wavelength. We measure the bulk Sensitivity (S) an...
Article
Full-text available
A tiny, low-cost evanescent-field biosensor chip with a directly integrated optical detector enables carcinogenic contaminant detection and shows promise for point-of-use application...
Article
Full-text available
In this paper, we report on the design, fabrication, and characterization of a photonic circuit for biosensing applications. Silicon oxynitride with a bulk refractive index of 1.66 is the core-layer material. The photonic circuit is optimized for a wavelength of ∼ 850 nm, which allows on-chip integration of the light source via cost effective verti...
Article
Full-text available
In this work, we present a study of Aflatoxin M1 detection by photonic biosensors based on Si₃N₄ Asymmetric Mach-Zehnder Interferometer (aMZI) functionalized with antibodies fragments (Fab'). We measured a best volumetric sensitivity of 10⁴ rad/RIU, leading to a Limit of Detection below 5 × 10(-7) RIU. On sensors functionalized with Fab', we perfor...
Article
Full-text available
In this article, we compared different silicon oxynitride (SiON) microring-based photonic structures for biosensing applications. We varied the refractive index of SiON as well as the dimensions of the resonators, and analyzed their volumetric sensitivity and limit of detection by using glucose-water solutions. By functionalizing the surface of the...
Article
Full-text available
In this article, we designed and studied silicon oxynitride (SiON) microring-based photonic structures for biosensing applications. We designed waveguides, directional couplers, and racetrack resonators in order to measure refractive index changes smaller than 10-6 refractive index units (RIU). We tested various samples with different SiON refracti...
Conference Paper
Full-text available
In this paper, we presented a study on microring-based photonic biosensors. The analyte was Aflatoxin M1, which is known to be hepatotoxic and carcinogenic. We measured the bulk Sensitivity (S) and Limit of Detection (LOD) as a function of the waveguide composition and dimensions. The sensing device was based on an array of four SiON microring reso...

Projects

Projects (2)
Archived project
Archived project
The SYMPHONY project develops heterogeneous technologies, encompassing photonics, biochemistry and microfluidics, integrated in a miniaturised smart system that will perform low cost label free detection of contaminants in milk and improve safety and quality of dairy products. The main goal is to produce an automated sampling and analysis system to be used in Hazard Analysis and Critical Control Points (HACCP).