sargent by huanghengdong


                   • Need chemically and optically stable
                   emission in the infrared biological
                   window 1050-1200 nm
                   • Grew PbS quantum dots on single-
                   stranded DNA

                   • Obtained record photoluminescence
                   quantum of 11.5%

                            DNApitaxy: Growth of Efficient, Stable
                     Infrared Quantum Dots on a Biomolecular Substrate

                  L. Levina, V. Sukhovatkin, S. Musikhin, S. Cauchi, E. H. Sargent
              Department of Electrical and Computer Engineering, University of Toronto
The Defense Advanced Research Projects Agency (DARPA) is soliciting
innovative research proposals in the area of silicon Electronic & Photonic
Integrated Circuit (EPIC) Technology

• Demonstrate monolithic integration of high performance photonics and
electronics on a single Si chip in a CMOS-compatible process
• Pursue photonic devices that are not currently available in Si, including light
emitters and lasers, optical amplifiers and nonlinear optical devices
• Spectral region of interest is the extended communications band ranging from
1200 nm to 1700 nm.
An Agile Optical Internet

      • reconfigurable lightpaths
      • the agile optical layer
      • dynamic virtual topologies
The Agile Optical Network Challenge:
  Complex Dynamics, Feedback & Delay

                 Optical Add/Drop

          Drop      Grating      Add
               Rx               Tx

        SMF/      DCM          DGE   PMDC
The common thread…?
            The common need

• Active optics 1000-2000 nm
• Effective
  – in solution (bio); or
  – from solution (CMOS-compatible processes)
• High efficiency, choosable spectrum,
  controllable linewidth
   Quantum Dots
Quantum Confinement
Our work: Electroluminescence
Our work: Electroluminescence



                               quantum dot

                 light out, selectable from 1.1 – 1.6 um
      Remaining challenge:
Infrared detectors 1000-2000 nm
 Templated Growth:
 The effect of commensurability

                                                           Planar packing density
                                                                                      3   4   5   6   7   8   9

                                                                                    Groove D [ mm ]
                                                                                           separation (mm)

Colloid deposited on mesoscopically patterned substrate.
Left: From left to right, the width of the groove are 2.22, 2.51 and 2.80 mm The particle
diameter was 0.58 mm.
Right: Planar packing density as a function of the groove width.
                         Theory –
Nonlinear Periodic Structures for Optical Signal Processing
Present: Ahmed Maria, Emanuel Istrate, Ethan Klem, Fred Chang, Fumiyo Yoshino,
   Gerasimos Konstanatos, Larissa Levina, Leo Yeung, Luda Bakoueva, Mathieu Allard,
   Neil Barakat, Paul Cyr, Sam Cauchi, Scott Kuntze, Sergei Musikhin, Steve McDonald,
   Tao Sun, Tengfeng Xie, Tim Wong, Vivek Mehta, Vlad Sukhovatkin

Past: Lukasz Brzozowski, Peggy Hines, Taulee Hsieh, Andrew Stok, Dayan Ban, Eddie Ng,
    Geoff Darling, Joyce Poon, Marian Tzolov, Pia Sindile, Qiying Chen, Wilfred Lam,
    Winnie Ye, Yuankun Lin

Nortel Networks                 Supporters
Edward S. Rogers Sr. Department of Electrical and Computer Engineering at the University
    of Toronto
Natural Sciences and Engineering Research Council Canada, Canada Research Chairs
    Programme, Canada Foundation for Innovation
Nortel Institute for Telecommunications at the University of Toronto
Photonics Research Ontario, Communications and Information Technology Ontario,
    Materials and Manufacturing Ontario, Ontario Innovation Trust, Ontario Government –
    Premier’s Research Excellence Award
D. N. Chorafas Foundation of Switzerland


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