• Login
    View Item 
    •   etd@IISc
    • Division of Electrical, Electronics, and Computer Science (EECS)
    • Electrical Communication Engineering (ECE)
    • View Item
    •   etd@IISc
    • Division of Electrical, Electronics, and Computer Science (EECS)
    • Electrical Communication Engineering (ECE)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Integrated Optic Microring Resonator based Sub-μN force and Force and Acceleration Sensors

    View/Open
    Thesis-Abstract (26.57Kb)
    Thesis-Full Text (11.42Mb)
    Author
    Kolli, Venkateswara Rao
    Metadata
    Show full item record
    Abstract
    Microring resonators have rapidly emerged in the past few years as a new sensing platform for miniaturization of modern integrated optical devices. Ring resonator are having advantages of compactness, stability with respect to back reflections, do not need facets or gratings for optical feedback, strong optical field enhancement inside cavities, high wavelength selectivity, narrow line width, high Q-factor and high sensitivity. These unique characteristics made microring resonator as promising platform for integrated photonics.. A generic ring resonator consists of an optical waveguide which is looped back on it self and coupled with a single or double bus waveguide. In this thesis, a compact microring resonator (MRR) is proposed and optimized to exhibit high sensitivity and quality factor. Also, force and acceleration sensing applications of MRR are discussed. Electromagnetic computations are done using Finite Difference Time Domain (FDTD) method. Fabrication and characterization of microring is also carried out. While the main emphasis is on design and analysis, this experimental work supports better understanding of practical issues in study of microring resonators. Then, the force sensing application of the optimized microring resonator is presented. The design and modeling of the devices, including the mechanical properties of the microcantilever beam, are done by using a Finite Element Method (FEM). The force sensing characteristics are presented for the force range of 0 to 1 μN. The drawbacks of single MRR can be overcome by using serially coupled double microring resonator(SC-DMRR) and serially coupled double racetrack resonator (SC-DRTR) with vernier effect. They provide, high FSR, low FWHM, high Q-factor and high sensitivity. By using SC-DMRR as an optical sensing element, a novel IO MEMS SC-DMRR based force sensor is proposed, resulting in high Q-factor of 19000 and force sensitivity of 100 pm/ 1μN. Further, in order to increase the sensitivity, a novel SCDRTR based force sensor is proposed. The study is expanded to photonic crystal microring resonator (PC-MRR) structures, where a PCMRR is designed in a hexagonal lattice of air holes on a silicon slab. A novel approach is used to optimize PC-MRR to achieve high Q-factor. A high sensitive force sensor based on PC-MRR integrated with silicon micro cantilever is presented. The force sensing characteristics are presented for forces in the range of 0 to 1 μN. For forces which are in the range of few tens of μN, a force sensor with bilayer cantilever is considered. Further, the PC-MRR equivalent microring resonator is designed and analyzed for comparison between the force sensors. Finally, a novel IO MEMS serially coupled racetrack resonator based accelerometer is proposed and the required characteristics like sensitivity and dynamic range are reported. In conclusion, IO micro ring resonators are the best candidates to design and develop force and acceleration sensors in the sub-μN sensitivities.
    URI
    https://etd.iisc.ac.in/handle/2005/4317
    Collections
    • Electrical Communication Engineering (ECE) [398]

    Related items

    Showing items related by title, author, creator and subject.

    • A Study of Mode Dependent Energy Dissipation in 2D MEMS Resonators 

      Doreswamy, Santhosh (2018-02-25)
      With the advent of micro and nano electromechanical systems (MEMS/NEMS), there has been rapid development in the design and fabrication of sensitive resonant sensors. Sensitivity of such devices depends on the resonant ...
    • Design And Analysis Of Integrated Optic Resonators For Biosensing Applications 

      Malathi, S (2016-09-15)
      In this thesis, we have designed and optimized strip waveguide based micro-ring and micro-ring and micro-racetrack resonators for biosensing applications. Silicon-On-Insulator (SOI) platform which offers several advantages ...
    • NMR Methods For The Study Of Partially Ordered Systems 

      Lobo, Nitin Prakash (2016-11-16)
      The work presented in this thesis has two parts. The first part deals with methodological developments in the area of solid-state NMR, relevant to the study of partially ordered systems. Liquid crystals are best examples ...

    etd@IISc is a joint service of SERC & J R D Tata Memorial (JRDTML) Library || Powered by DSpace software || DuraSpace
    Contact Us | Send Feedback | Thesis Templates
    Theme by 
    Atmire NV
     

     

    Browse

    All of etd@IIScCommunities & CollectionsTitlesAuthorsAdvisorsSubjectsBy Thesis Submission DateThis CollectionTitlesAuthorsAdvisorsSubjectsBy Thesis Submission Date

    My Account

    LoginRegister

    etd@IISc is a joint service of SERC & J R D Tata Memorial (JRDTML) Library || Powered by DSpace software || DuraSpace
    Contact Us | Send Feedback | Thesis Templates
    Theme by 
    Atmire NV