Wavelength-tunable colloidal quantum dot laser on ultra-thin flexible glass

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A mechanically flexible and wavelength-tunable laser with an ultra-thin glass membrane as substrate is demonstrated. The optically pumped hybrid device has a distributed feedback cavity that combines a colloidal quantum dot gain film with a grating-patterned polymeric underlayer, all on a 30-μm thick glass sheet. The total thickness of the structure is only 75 μm. The hybrid laser has an average threshold fluence of 450 ± 80 μJ/cm2 (for 5-ns excitation pulses) at an emitting wavelength of 607 nm. Mechanically bending the thin-glass substrate enables continuous tuning of the laser emission wavelength over an 18-nm range, from 600 nm to 618 nm. The correlation between the wavelength tunability and the mechanical properties of the thin laser structure is verified theoretically and experimentally.

LanguageEnglish
Article number141108
Number of pages4
JournalApplied Physics Letters
Volume104
Issue number14
DOIs
Publication statusPublished - 11 Apr 2014

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quantum dots
glass
wavelengths
lasers
tunable lasers
fluence
tuning
gratings
mechanical properties
membranes
cavities
thresholds
pulses
excitation

Keywords

  • quantum dot laser
  • ultra thin flexible glass
  • wavelength tunability
  • laser glasses
  • diffraction gratings
  • distributed feedback lasers
  • emission spectra
  • laser materials

Cite this

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title = "Wavelength-tunable colloidal quantum dot laser on ultra-thin flexible glass",
abstract = "A mechanically flexible and wavelength-tunable laser with an ultra-thin glass membrane as substrate is demonstrated. The optically pumped hybrid device has a distributed feedback cavity that combines a colloidal quantum dot gain film with a grating-patterned polymeric underlayer, all on a 30-μm thick glass sheet. The total thickness of the structure is only 75 μm. The hybrid laser has an average threshold fluence of 450 ± 80 μJ/cm2 (for 5-ns excitation pulses) at an emitting wavelength of 607 nm. Mechanically bending the thin-glass substrate enables continuous tuning of the laser emission wavelength over an 18-nm range, from 600 nm to 618 nm. The correlation between the wavelength tunability and the mechanical properties of the thin laser structure is verified theoretically and experimentally.",
keywords = "quantum dot laser, ultra thin flexible glass, wavelength tunability, laser glasses, diffraction gratings, distributed feedback lasers, emission spectra, laser materials",
author = "C. Foucher and B. Guilhabert and N. Laurand and Dawson, {M. D.}",
note = "Copyright (2014) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in C. Foucher et al., Appl. Phys. Lett. 104, 141108 (2014) http://dx.doi.org/10.1063/1.4871372 and may be found at http://scitation.aip.org/content/aip/journal/apl/104/14/10.1063/1.4871372. This paper demonstrates a novel and mechanically flexible encapsulation technology for colloidal quantum dot (CQD) lasers. CQD materials are semiconductor nanocrystals which are surface-functionalised to enable solution processing, and are the subject of worldwide research interest for applications including sensing, and novel display and lighting technology. Here we provide the encapsulation essential to long-life performance of CQD lasers in a format that also promotes low-threshold operation towards direct diode pumping and introduces a new way (bending) of tuning the lasers. This work was conceived and led by Professor Dawson and has received 8 citations to date (Google Scholar).",
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Wavelength-tunable colloidal quantum dot laser on ultra-thin flexible glass. / Foucher, C.; Guilhabert, B.; Laurand, N.; Dawson, M. D.

In: Applied Physics Letters, Vol. 104, No. 14, 141108, 11.04.2014.

Research output: Contribution to journalArticle

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AU - Laurand, N.

AU - Dawson, M. D.

N1 - Copyright (2014) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in C. Foucher et al., Appl. Phys. Lett. 104, 141108 (2014) http://dx.doi.org/10.1063/1.4871372 and may be found at http://scitation.aip.org/content/aip/journal/apl/104/14/10.1063/1.4871372. This paper demonstrates a novel and mechanically flexible encapsulation technology for colloidal quantum dot (CQD) lasers. CQD materials are semiconductor nanocrystals which are surface-functionalised to enable solution processing, and are the subject of worldwide research interest for applications including sensing, and novel display and lighting technology. Here we provide the encapsulation essential to long-life performance of CQD lasers in a format that also promotes low-threshold operation towards direct diode pumping and introduces a new way (bending) of tuning the lasers. This work was conceived and led by Professor Dawson and has received 8 citations to date (Google Scholar).

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N2 - A mechanically flexible and wavelength-tunable laser with an ultra-thin glass membrane as substrate is demonstrated. The optically pumped hybrid device has a distributed feedback cavity that combines a colloidal quantum dot gain film with a grating-patterned polymeric underlayer, all on a 30-μm thick glass sheet. The total thickness of the structure is only 75 μm. The hybrid laser has an average threshold fluence of 450 ± 80 μJ/cm2 (for 5-ns excitation pulses) at an emitting wavelength of 607 nm. Mechanically bending the thin-glass substrate enables continuous tuning of the laser emission wavelength over an 18-nm range, from 600 nm to 618 nm. The correlation between the wavelength tunability and the mechanical properties of the thin laser structure is verified theoretically and experimentally.

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