JRA3: Quantum dot arrays with engineered linear and nonlinear optical properties for selective optic

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JRA3 Quantum dot arrays with engineered linear
and nonlinear optical properties for selective
optical signal processing

• Coordinator Richard Nötzel (r.noetzel_at_tue.nl)
• Deputy Coordinator Sanguan Anantathanasarn
  (s.anantathanasarn_at_tue.nl)

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Research Integration Targets

• Combining the expertise of leading scientists in
  the field and their complementary key facilities
  for
• Full assessment of the fabrication, structural
  properties, and spatio-temporal linear and
  nonlinear optical properties of ordered QD
  arrays.
• One full set of experiments per year starting
  with linear InAs/GaAs QD arrays followed by
  2-dim. InAs/GaAs QD arrays and InAs/InP QD arrays
• Supported by two junior research exchanges per
  year.

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Progress measured against targets (1)

• Progress towards objectives
• Micro-PL (UAM) and SNOM (MBI) measurements of
  linear InAs/GaAs QD arrays grown at eiTT/COBRA.
• TEM measurements (PDI) of wavelength tunable
  ordered InAs/InP QD arrays grown at eiTT/COBRA.
• One junior research exchange (UAM-eiTT/COBRA)

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Progress measured against targets (2)

• Relation to state-of-the art
• Measurements of linear InAs/GaAs QD arrays and
  InAs/InP QDs performed
• Necessary to improve spatial resolution for
  micro-PL (see junior exchange)
• After first results are established, the junior
  research exchange can be enhanced
• New samples (doped) in preparation, in particular
  also waveguide structures for COM

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Research highlights (1)

• Micro-PL of linear InAs/GaAs QD arrays
• SNOM of single InAs/GaAs QD in arrays

Important CorrelationStructural vs. Optical
Properties
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Research highlights (2)

• TEM of wavelength tunable InAs/InP QD arrays

X-TEM and HR TEM layer separation 40 nm
AFM, 2x2 ?m2
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Additional work

• Additional work planned/realised with additional
  consumable budget, if any
• No work planned/realised with additional
  consumable budget

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Junior Exchanges

• Junior Exchanges realised
• Dipankar Sarkar UAM ? eiTT/COBRA
• September 5 16, 2005
• Fabrication of metallic masks at eiTT/COBRA on
  linear InAs/GaAs QD arrays grown at eiTT/COBRA by
  e-beam lithography and etching to enhance the
  spatial resolution for micro-PL measurements
  performed at UAM.

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Problems actions

• Deviations and/or problems (if any) and planned
  actions
• Junior research exchange and exchange at the
  senior level are on the short side
• After first solid results are established the
  junior and senior research exchange can be
  enhanced

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M12-30 Planning

• Detailed planning for M12-30
• Continue measurements of linear InAs/GaAs QD
  arrays
• Measurements of 2-dim. InAs/GaAs QD arrays
• M24 Thorough comparison of linear and 2-dim.
  InAs/GaAs QD arrays
• Fabrication and detailed measurements of InAs/InP
  QD arrays for telecom applications, including
  waveguide structures
• Identify a joint research program based on the
  achieved results for continuation