Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • 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
Polymeric Microcavities for Dye Lasers and Wavefront Shapers
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
2008 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Over the last few years, the available computing power allows us to have a deeper insight into photonics components than we ever had before. In this thesis we use the finite element method (FEM) to explore the behavior of the waves in 2D planar microcavities. We demonstrate the tunability of the cavity over a wide range of frequencies taking into account both the thermo-mechanical and the thermo-optical effect. Geometry and material choices are done so that the latter is predominant. We also demonstrate an odd mode disappearing phenomenon reported here for the first time as far as we know. Using this knowledge, we design two structures with these remarkable properties.

One of the devices will be used as micro-sized solid-state dye laser with Rhodamine 6G as the active medium and SU-8 polymer as a cavity material in sizes that have never been reached before. This opens new opportunities not only for future implementation for “labs-on-a-chip” (LOC) but also for a higher integration density of optical communication systems. The second device is a wavefront shaper creating plane waves from a point source performing the functions of beam shaper and beam splitter with plane wave as the output result.

After an introduction to FEM and comparison with a rival algorithm, some issues related to FEM in electromagnetic simulation are resolved and explained. Finally, some fabrication techniques with feature sizes <100 nm, such as electron beam lithography (EBL) and nano-imprint lithography (NIL), are described and compared with other lithographic techniques.

Place, publisher, year, edition, pages
Stockholm: KTH , 2008. , 52 p.
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2008:3
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-4655ISBN: 978-91-7178-889-4 (print)OAI: oai:DiVA.org:kth-4655DiVA: diva2:13265
Presentation
2008-03-19, Sal N2, KTH-Electrum 3, Isafjordsgatan 28, b v, Kista, 10:15
Opponent
Supervisors
Note
QC 20101119Available from: 2008-02-29 Created: 2008-02-29 Last updated: 2010-11-19Bibliographically approved
List of papers
1. Mode suppression in a microcavity solid-state dye laser
Open this publication in new window or tab >>Mode suppression in a microcavity solid-state dye laser
2007 (English)In: Journal of the european optical society-rapid publications, ISSN 1990-2573, Vol. 2, 07203- p.Article in journal (Refereed) Published
Abstract [en]

A solid-state dye laser with a microcavity whose size is comparable to the lasing wavelength, is modeled by means of the finite element method. The position of the pumping source affects the lasing mode spectrum. In comparison with a single point source at the edge of the cavity, a random distribution of excitation sources in the central gain part of the microcavity leads to suppression of odd longitudinal modes and to higher output efficiency of the laser radiation in even modes. The modeling and simulation results are explained by simple physical considerations.

Keyword
microcavity, solid-state dye laser, mode depletion
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-8045 (URN)10.2971/jeos.2007.07023 (DOI)000206312800021 ()2-s2.0-84887200521 (Scopus ID)
Note
QC 20101119Available from: 2008-02-29 Created: 2008-02-29 Last updated: 2010-11-19Bibliographically approved
2. Thermally induced wavelength tunability of microcavity solid-state dye lasers
Open this publication in new window or tab >>Thermally induced wavelength tunability of microcavity solid-state dye lasers
2007 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 15, no 20, 12971-12978 p.Article in journal (Refereed) Published
Abstract [en]

Wavelength tunability of a microcavity solid-state dye laser is modeled and demonstrated by simulations making use of the finite element method. We investigate the application of two phenomena, thermoelastic expansion of the microcavity material and thermo-induced change of the refractive index, to tune the microcavity mode frequencies by a variation of the effective optical path. An optimized size of the laser microcavity is defined depending on the operation wavelength bandwidth and the glass transition temperature of the gain material.

Keyword
Bandwidth, Microcavities, Solid state lasers, Thermal effects, Thermoelasticity, Wavelength
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-8046 (URN)10.1364/OE.15.012971 (DOI)000250006700043 ()2-s2.0-35148845946 (Scopus ID)
Note
QC 20101004Available from: 2008-02-29 Created: 2008-02-29 Last updated: 2017-12-14Bibliographically approved
3. Wavefront shaping: plane waves out of a point source
Open this publication in new window or tab >>Wavefront shaping: plane waves out of a point source
2007 (English)In: Proceedings of the Comsol users conference, 2007, 761-764 p.Conference paper, Published paper (Other academic)
Abstract [en]

Using finite element method (FEM) implemented in Comsol Multiphysics simulation package, we present a model of beam shaper that converts spherical waves into one or two plane waves as a function of wavelength. Thus, the device can realize both wavefront shaping and beam splitting in only one structure. Comparing with different methods already presented, we introduce a solution for a smaller, simpler, and easier to manufacture device. We demonstrate a wavefront shaper using a microstructure of 8 x 8 μm size with commercially available material. We also discuss fabrication methods suitable for implementing the SU-8 polymer in the device.

Keyword
Beam shaping, micro-optics, Finite Element Method, polymers, nano-imprint lithography
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-8047 (URN)
Note
QC 20101119Available from: 2008-02-29 Created: 2008-02-29 Last updated: 2010-11-19Bibliographically approved

Open Access in DiVA

fulltext(989 kB)1141 downloads
File information
File name FULLTEXT01.pdfFile size 989 kBChecksum MD5
6ea12ca8aa44e1674d37316bd97df1ffe880d2c8d0e66586e69e14c0bafaf8542de35bce
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Ricciardi, Sébastien
By organisation
Microelectronics and Applied Physics, MAP
Atom and Molecular Physics and Optics

Search outside of DiVA

GoogleGoogle Scholar
Total: 1141 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 389 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • 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