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<p class="MsoNormal"><span style="font-size:15.0pt;color:black">There will be a Modern Optics and Spectroscopy Seminar held<span class="apple-converted-space"><b> </b></span><b>Tuesday, November 26<span class="apple-converted-space"> </span></b>in<span class="apple-converted-space"> </span><b><a href="http://whereis.mit.edu/?go=34"><span style="color:#954F72">34-401A</span></a><span class="apple-converted-space"> </span>at
12pm</b></span><span style="color:black"><o:p></o:p></span></p>
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<b><span style="font-size:14.0pt;color:red"> </span></b><b><span style="font-size:14.0pt;color:black"> </span></b><span style="color:black"><o:p></o:p></span></p>
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<b><span style="font-size:20.0pt;color:black">David J. Norris</span></b><b><span style="font-size:12.0pt;font-family:"Adobe 명조 Std M",serif;color:black"><o:p></o:p></span></b></p>
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<span class="3"><b><span style="font-size:16.0pt;color:black">ETH Zürich</span></b></span><i><span style="font-size:14.0pt;font-family:"Adobe 명조 Std M",serif;color:black"><br>
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</span></i><b><span style="font-size:18.0pt;font-family:"Arial",sans-serif;color:black">“Optical Fourier Surfaces</span></b><span class="1"><b><span style="font-size:18.0pt;font-family:"Arial",sans-serif;color:black">”</span></b></span><span style="font-size:12.0pt;font-family:"Adobe 명조 Std M",serif;color:black"><o:p></o:p></span></p>
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</span><span class="4"><span style="font-size:12.0pt;font-family:"Calibri Light",sans-serif;color:black">Gratings and holograms are patterned surfaces that tailor optical signals by diffraction. Despite the long history of such structures, variants with remarkable
functionalities continue to be discovered. Further advances could exploit Fourier optics, which specifies the surface pattern that generates a desired diffracted output through its Fourier transform. The required surface profile should contain a precise sum
of sinusoidal waves, each with a well-defined amplitude, spatial frequency, and phase, to shape the optical wavefront. However, because fabrication techniques typically yield profiles with at most a few depth levels, complex “wavy” surfaces cannot be obtained,
limiting the straightforward mathematical design and implementation of sophisticated diffractive optics. In this presentation, we will discuss a simple yet powerful approach to eliminate this design–fabrication mismatch by demonstrating optical surfaces that
contain an arbitrary number of specified sinusoids. Multicomponent linear gratings allow precise manipulation of the dispersion, stopbands, and coupling of electromagnetic signals. More broadly, we analytically design and accurately replicate intricate two-dimensional
moiré patterns, quasicrystals, and holograms, demonstrating a variety of previously impossible diffractive surfaces. Therefore, this approach provides instant benefit for optical devices (biosensors, lasers, metasurfaces, and modulators) and emerging topics
in photonics (topological structures, transformation optics, and valleytronics).
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<span style="font-size:14.0pt;color:black">Refreshments will be served immediately following the seminar!</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Michelle Contos</span></i><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Administrative Assistant</span></i><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Massachusetts Institute of Technology</span></i><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Department of Chemistry</span></i><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">77 Massachusetts Ave, 6-333</span></i><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Cambridge, MA 02139</span></i><o:p></o:p></p>
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