Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Spectral behavior of integrated distributed-feedback resonators utilizing a distributed phase shift
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0001-7688-1367
Show others and affiliations
2019 (English)In: SPIE Optics + Optoelectronics, 01 - 04 April 2019, Prague - Czech Republic., 2019, Vol. 11031Conference paper, Published paper (Refereed)
Abstract [en]

Bragg-grating-based distributed-feedback waveguide resonators, with a discrete phase shift introduced inside the Bragg grating, exhibit within their grating reflection band a Lorentzian-shaped resonance line with an ultranarrow linewidth. If the phase shift is π/2, the resonance is located at the center of the reflection band, i.e., at the Bragg wavelength, where the grating reflectivity is maximum, hence the resonance linewidth is minimum. Alternatively, the required π/2 phase shift is often introduced by a distributed change in effective refractive index, e.g. by adiabatically widening the waveguide. Despite careful design and fabrication, the experimentally observed resonance wavelength deviates from the designed one. Besides deviations owing to fabrication errors, a fundamental, systematic shift towards shorter wavelengths occurs. We show theoretically and experimentally that the decay of light intensity during propagation from the phase-shift center into both sides of the Bragg grating due to (i) reflection by the periodic grating and (ii) the adiabatic refractive-index change causes an incomplete accumulation of designed phase shift by the oscillating light, thereby systematically shifting the resonance to a shorter wavelength. Calculations are performed based on the characteristic-matrix approach. Experimental studies are carried out in distributed-feedback channel-waveguide resonators in an amorphous aluminum oxide thin film on silicon with a distributed phase shift introduced by adiabatic widening of the waveguide according to a sin2 function. Calculations and experiments show good agreement. Considering in the design the overlap integral between distributed phase shift and light intensity provides a performance that is much closer to the desired value.

Place, publisher, year, edition, pages
2019. Vol. 11031
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-251675DOI: 10.1117/12.2523926ISI: 000485117400014Scopus ID: 2-s2.0-85073899498OAI: oai:DiVA.org:kth-251675DiVA, id: diva2:1316431
Conference
SPIE Optics + Optoelectronics, 01 - 04 April 2019, Prague - Czech Republic.
Note

QC 20190625

Available from: 2019-05-17 Created: 2019-05-17 Last updated: 2020-03-10Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopushttps://spie.org/conferences-and-exhibitions/optics-and-optoelectronics

Authority records BETA

Kores, Cristine CalilIsmail, NurLaurell, FredrikPollnau, Markus

Search in DiVA

By author/editor
Kores, Cristine CalilIsmail, NurBernhardi, E. H.Laurell, FredrikPollnau, Markus
By organisation
Laser PhysicsMaterials and Nanophysics
Atom and Molecular Physics and Optics

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 68 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf