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<!--StartFragment--><p class="MsoTitle" style="margin-right:-.5in"><font class="Apple-style-span" face="'Times New Roman'" size="4"><b><br></b></font></p><p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4"><b style="mso-bidi-font-weight:
normal"><span style="letter-spacing: 1.5pt; ">Modern Optics and Spectroscopy</span></b></font><b style="mso-bidi-font-weight:
normal"><span style="font-family: Arial; letter-spacing: 1pt; "><o:p><font class="Apple-style-span" size="4"> </font></o:p></span></b></p><p class="MsoNormal" align="center" style="text-align:center"><b style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">J-aggregates:<span style="mso-spacerun:yes"> </span>Excitonic Material for Strong Light-Matter Coupling
and Energy Funneling</font></span></i></b></p><div><br></div><p class="MsoNormal" align="center" style="text-align:center"><b style="mso-bidi-font-weight:
normal"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">Gleb M. Akselrod,<o:p></o:p></font></span></b></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">Massachusetts
Institute of Technology</font></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">Tuesday,
April 23, 2013</font></span><span class="Apple-style-span" style="letter-spacing: 1px; font-size: large; "> </span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">12:00 –
1:00 p.m.</font></span></p><p class="MsoNormal" style="mso-pagination:none;mso-layout-grid-align:none;
text-autospace:none"><font class="Apple-style-span" size="4"><span style="font-family:Helvetica;mso-bidi-font-family:
Helvetica">Coherent coupling between chromophores is in part responsible for
the remarkable energy transfer efficiency of natural photosynthetic systems. If
Nature can do it, can we engineer materials with such coherent interactions that
can be harnessed in optoelectronic devices ranging from lasers to solar cells
to photodectectors? In this talk I will discuss my work on J-aggregates, a
remarkable organic material made by the self-assembly of organic dye molecules
into sheets. The result of this aggregation is a coherently delocalized exciton
at room temperature with extremely high optical absorption and record exciton
diffusion lengths (~100 nm). I will first show that these J-aggregate
properties can be exploited in optical microcavities to obtain laser operation
in the strong light-matter coupling regime. Second, I will demonstrate how
J-aggregates can be used as an excitonic antenna for fluorescence enhancement
of single molecules and quantum dots, an excitonic analogue to plasmonic
enhancement. </span></font></p><p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4">Grier Room, MIT Bldg 34-401<o:p></o:p></font></p><p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4">Refreshments served after
the lecture</font><font class="Apple-style-span" size="6"><o:p></o:p></font></p>
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