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<p class="MsoNormal"><span style="font-size:14.0pt">There will be a Modern Optics and Spectroscopy Seminar held
<b>today at 12pm </b>in <b><span style="color:red">5-234</span></b></span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt;color:red"> </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt;color:red">**Please note location**</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt"> </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:16.0pt">Hendrik Utzat<br>
MIT – Bawendi Group</span></b><i><span style="font-size:14.0pt"><br>
<br>
</span></i><b><i><span style="font-size:16.0pt">“<span style="color:black">Spectroscopy and Rational Chemical Design of Single Emitters for Quantum Photonics</span>”</span></i></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:13.0pt;color:black">Emerging single quantum emitters such as lead halide perovskite quantum dots (PQDs) or fluorescent defects in 2D materials are promising material platforms for the realization of quantum-photonic
technologies based on single photons. However, the in-depth investigation of the relevant single emitter photo-physics has been hampered by the lack of suitable spectroscopic techniques. Here, I show that the marriage of photon-correlation and Fourier spectroscopy
provides a tool that can reliably be used to assess the single-photon purity and optical coherence times of single photon emitters. I show that ensemble-level photon-correlation spectroscopy of single emitters in solution can identify PQDs with high single
photon purity and narrow emission linewidths and that these parameters can be controlled with the chemical synthesis.[1] Photon-correlation Fourier spectroscopy (PCFS) of single emitters at low temperatures measures the optical coherence times without obfuscating
effects of fast (</span></i><i><span style="font-size:13.0pt;color:#222222;background:white">μs</span></i><i><span style="font-size:13.0pt;color:black">) spectral diffusion. Using PCFS, we find that PQDs display highly efficient and coherent single photon
emission. These measurements suggest that, unlike any other colloidal quantum dot material, PQDs can be explored as building blocks in sources of indistinguishable single photons.[2] I extend these photon-coherence measurements to quantum defects in 2D hexagonal
boron nitride.</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:13.0pt"> </span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:13.0pt;color:black">[1] Utzat et al.
<span style="background:white">Nano Lett., <b>2017</b>, 17 (11), pp 6838–6846.</span></span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:13.0pt;color:black;background:white">[2] Utzat et al. Science,
<b>2019</b>, 363 (6431), pp. 1068-1072.</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><br>
<br>
</i><span style="font-size:14.0pt">Refreshments will be served immediately following the seminar!</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Christine Brooks</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Administrative Assistant</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Massachusetts Institute of Technology</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Department of Chemistry</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">77 Massachusetts Ave, 6-333</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Cambridge, MA 02139</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">p: 617.253.7239</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">e: <a href="mailto:cbrooks@mit.edu">cbrooks@mit.edu</a></span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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