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<!--StartFragment--><p class="MsoTitle" style="text-align: center; margin-right: -0.5in;"><b><span style="font-family: 'Times New Roman'; font-size: 14px;">Seminar on</span></b><b><span style="font-family: 'Times New Roman'; font-size: 14px;"> </span></b></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-size: 14px;"><b><span style="letter-spacing: 1.5pt;">Modern Optics and Spectroscopy</span></b><span style="font-family:Arial;
mso-bidi-font-family:"Times New Roman";letter-spacing:1.5pt"><o:p></o:p></span></span></p><p class="MsoNormal" style="text-align: center;"><b><span style="font-family: Arial; letter-spacing: 1pt; font-size: 14px;"> </span></b></p><p class="MsoNormal" align="center" style="text-align:center"><b><i><span style="letter-spacing: 1pt; font-size: 14px;">Lighting up the Raman Signal of
molecules in the vicinity of Graphene related materials<o:p></o:p></span></i></b></p><p class="MsoNormal" align="center" style="text-align:center"><b><i><span style="letter-spacing: 1pt; font-size: 14px;"> </span></i></b></p><p class="MsoNormal" align="center" style="text-align:center"><b><span style="letter-spacing: 1pt; font-size: 14px;">Xi Ling,<o:p></o:p></span></b></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; font-size: 14px;">Massachusetts
Institute of Technology</span><span style="font-size: 14px; letter-spacing: 1pt;"> </span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; font-size: 14px;">Tuesday,
April 21, 2015<o:p></o:p></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt;"><span style="font-size: 14px;">12:00 –
1:00 p.m.</span><font size="6"><o:p></o:p></font></span></p><div style="margin: 0in 0in 0.0001pt; text-align: justify;"><span style="font-size: 14px;"><span style="line-height: 115%; font-family: 'Times New Roman';">Surface enhanced Raman
scattering (SERS) is a popular technique to detect the molecules with high
selectivity and sensitivity. It has been developed for 40 years, and many
review papers have been published to summarize the progress in SERS.
Nevertheless, how to make the SERS signals repeatable and quantitative, and how
to have deeper understanding on the chemical enhancement mechanism are still
big challenges. Recently, graphene, as well as the other two dimensional (2D)
materials, were developed to be used as a Raman enhancement substrate, which can
light up the Raman signals of molecules, and these substrates were demonstrated
to be a promising for micro/trace species detection. This effect was named as
“graphene enhanced Raman scattering (GERS)”. GERS technique offers significant
advantages for studying molecular vibrations due to the</span><span style="line-height: 115%; font-family: 'Times New Roman';">
ultraflat and chemically inert 2D surfaces, which are newly available,
especially in developing a quantitative and repeatable signal enhancement
technique, complementary to SERS. Moreover, GERS is a chemical mechanism
dominated effect, which offers a valuable model to study the details of the
chemical mechanism. As a practical technique, the combination of GERS with a
metal substrate incorporates the advantages from both the conventional SERS and
GERS. The introduction of graphene to the Raman enhancement substrate extended
SERS applications in a more controllable and quantitative way. In this talk, I
will introduce this novel technique and our recent progress on GERS. <o:p></o:p></span></span></div><p class="MsoNormal" style="text-align:justify;mso-pagination:none;mso-layout-grid-align:
none;text-autospace:none"><span style="font-family: Helvetica; font-size: 14px;"><o:p> </o:p></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-size: 14px;">Grier Room, MIT Bldg. 34-401<o:p></o:p></span></p><p class="MsoNormal" align="center" style="text-align:center">
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<!--EndFragment--></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-size: 14px;">Refreshments served after the lecture</span><span style="font-size: 16pt;"><o:p></o:p></span></p>
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