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All-optical wavelength conversion by picosecond burst absorption in colloidal PbS quantum dots

Pieter Geiregat (UGent) , Arjan Houtepen (UGent) , Dries Van Thourhout (UGent) and Zeger Hens (UGent)
(2016) ACS NANO. 10(1). p.1265-1272
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Project
Center for nano- and biophotonics (NB-Photonics)
Abstract
All-optical approaches to change the wavelength of a data signal are considered more energy- and cost-effective than current wavelength conversion schemes that rely on back and forth switching between the electrical and optical domains. However, the lack of cost-effective materials with sufficiently adequate optoelectronic properties hampers the development of this so-called all-optical wavelength conversion. Here, we show that the interplay between intraband and band gap absorption in colloidal quantum dots leads to a very strong and ultrafast modulation of the light absorption after photoexcitation in which slow components linked to exciton recombination are eliminated. This approach enables all-optical wavelength conversion at rates matching state-of-the-art convertors in speed, yet with cost-effective solution-processable materials. Moreover, the stronger light–matter interaction allows for implementation in small-footprint devices with low switching energies. Being a generic property, the demonstrated effect opens a pathway toward low-power integrated photonics based on colloidal quantum dots as the enabling material.
Keywords
transient absorption, nanocrystals, intraband absorption, all-optical signal processing, LIGHT, CDSE, MODULATION, SILICON PHOTONICS, NANOCRYSTALS, EXTINCTION COEFFICIENTS

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Citation

Please use this url to cite or link to this publication:

Chicago
Geiregat, Pieter, Arjan Houtepen, Dries Van Thourhout, and Zeger Hens. 2016. “All-optical Wavelength Conversion by Picosecond Burst Absorption in Colloidal PbS Quantum Dots.” Acs Nano 10 (1): 1265–1272.
APA
Geiregat, P., Houtepen, A., Van Thourhout, D., & Hens, Z. (2016). All-optical wavelength conversion by picosecond burst absorption in colloidal PbS quantum dots. ACS NANO, 10(1), 1265–1272.
Vancouver
1.
Geiregat P, Houtepen A, Van Thourhout D, Hens Z. All-optical wavelength conversion by picosecond burst absorption in colloidal PbS quantum dots. ACS NANO. 2016;10(1):1265–72.
MLA
Geiregat, Pieter, Arjan Houtepen, Dries Van Thourhout, et al. “All-optical Wavelength Conversion by Picosecond Burst Absorption in Colloidal PbS Quantum Dots.” ACS NANO 10.1 (2016): 1265–1272. Print.
@article{7055523,
  abstract     = {All-optical approaches to change the wavelength of a data signal are considered more energy- and cost-effective than current wavelength conversion schemes that rely on back and forth switching between the electrical and optical domains. However, the lack of cost-effective materials with sufficiently adequate optoelectronic properties hampers the development of this so-called all-optical wavelength conversion. Here, we show that the interplay between intraband and band gap absorption in colloidal quantum dots leads to a very strong and ultrafast modulation of the light absorption after photoexcitation in which slow components linked to exciton recombination are eliminated. This approach enables all-optical wavelength conversion at rates matching state-of-the-art convertors in speed, yet with cost-effective solution-processable materials. Moreover, the stronger light--matter interaction allows for implementation in small-footprint devices with low switching energies. Being a generic property, the demonstrated effect opens a pathway toward low-power integrated photonics based on colloidal quantum dots as the enabling material.},
  author       = {Geiregat, Pieter and Houtepen, Arjan and Van Thourhout, Dries and Hens, Zeger},
  issn         = {1936-0851},
  journal      = {ACS NANO},
  language     = {eng},
  number       = {1},
  pages        = {1265--1272},
  title        = {All-optical wavelength conversion by picosecond burst absorption in colloidal PbS quantum dots},
  url          = {http://dx.doi.org/10.1021/acsnano.5b06630},
  volume       = {10},
  year         = {2016},
}

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