Title page for etd-0613116-112052


[Back to Results | New Search]

URN etd-0613116-112052
Author Tzu-Hsiang Yen
Author's Email Address No Public.
Statistics This thesis had been viewed 5350 times. Download 0 times.
Department Electro-Optical Engineering
Year 2015
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Nonlinear thermo-optic effect in graphene oxide on silicon micro-ring resonator
Date of Defense 2016-07-22
Page Count 60
Keyword
  • ring resonator
  • nonlinear optics
  • silicon photonics
  • graphene oxide
  • Abstract This thesis focuses on the nonlinear effects of the Si micro-ring resonators on silicon-on-insulator platform. A high extinction ratio and narrowband filter can be achieved by using a high-quality-factor micro-ring resonators, which typically has a small radius and a wider gap between the ring and the straight bus waveguide. As we look for higher quality factor, the storage of photon energy inside the ring is also enhanced, leading to stronger nonlinear effects. Such a field enhancement in the ring resonator gives rise to two photon absorption (TPA) and its induced free carrier absorption effect, all leading to a nonlinear photo-thermal phenomenon. Due to these effects, an increase in input optical power of micro-ring resonator would result in an asymmetric resonance dips, wavelength shift, and bistability in its transmission spectra. The reference micro-ring resonators with an air top-cladding are characterized to exhibit a wavelength shift of 0.6 nm/mW, 0.26 nm/mW, and 0.14 nm/mW, respectively, for a radius of 2.5 μm, 5μm, and 10 μm. We anticipate to enhance the photo-thermal nonlinearity by depositing a graphene oxide layer atop the air-clad micro-ring resonators. The graphene oxide thin film can be obtained by either converting from a monolayer pristine graphene via ultraviolet ozone treatment or by spin-coating chemically-exfoliated graphene oxide. Experimental results reveal a two-time enhancement in wavelength shift of 1.2 nm/mW, 0.9 nm/mW and 0.4 nm/mW, respectively, from graphene oxide covered micro-ring resonators having a radius of 2.5 μm, 5μm, and 10 μm.
    Advisory Committee
  • San-Liang Lee - chair
  • Tsung-Hsien Lin - co-chair
  • Wei Lin - co-chair
  • Chia-chien Wei - co-chair
  • Yung-Jr Hung - advisor
  • Files
  • etd-0613116-112052.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2016-08-12

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys