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Upcoming Event: Tuesday August 1, 2017 -- N. B. Change of Address!!

Title: Large-area, reconfigurable optical metamaterials

Date: Tuesday August 1, 2017

5:30pm: Networking/Light Dinner
6:30pm: Presentation
8:00pm: Adjourn

Dolby (N.B. different location; NOT at INTEL!!)
432 Lakeside Dr.,
Sunnyvale, CA 95085

From US-101. Take US-101 to Lawrence Expressway. Exit South. Turn Left onto Oakmead Parkway and turn Right onto Lakeside Drive. Dolby will be on your left.

From Central Expressway. Take Central Expressway to Lawrence Expressway. Exit North. Turn Right onto E Arques Avenue (Scott Blvd) and turn Left onto Lakeside Drive. Dolby will be on your right.

Main entrance to the building is from Tiros Way. There is plenty of parking around the building that is accessible from Lakeside Drive and Tiros way.

In order for chapter officers to estimate head count for food, Registration required! Register:

Title: Large-area, reconfigurable optical metamaterials

Speaker: Prof. Jennifer Dionne, Stanford


Advances in metamaterials and metasurfaces have enabled unprecedented control of light-matter interactions. Metamaterial constituents support high-frequency electric and magnetic dipoles, which can be used as building blocks for new materials capable of negative refraction, electromagnetic cloaking, strong visible-frequency circular dichroism, and enhanced magnetic or chiral transitions in ions and molecules. However, most metamaterials to date have been limited to solid-state, static, narrow-band, and/or small-area structures. Here, we introduce the design, fabrication, and three-dimensional nano-optical characterization of large-area, dynamically-tunable metamaterials and gram-scale metafluids. First, we use transformation optics to design a broadband metamaterial constituent - a metallo-dielectric nanocrescent - characterized by degenerate electric and magnetic dipoles. A periodic array of nanocrescents exhibits large positive and negative refractive indices at optical frequencies that are largely insensitive to the wavelength, orientation and polarization of incident light. Then, we introduce a new tomographic technique, cathodoluminescence (CL) spectroscopic tomography, to probe light-matter interactions in individual nanocrescents with nanometer-scale resolution. Two-dimensional CL maps of the three-dimensional nanostructure are obtained at various orientations, allowing us to reconstruct the electromagnetic eigenmodes at each wavelength in three dimensions. Finally, we demonstrate the fabrication of dynamically tunable large-area metamaterials and gram-scale metafluids, using a combination of colloidal synthesis, protein-directed assembly, self-assembly, etching, and stamping. The electric and magnetic response of the bulk metamaterial and metafluid are directly probed with optical scattering and spectroscopy. Using chemical swelling, these metamaterials exhibit reversible, unity-order refractive index changes across both positive and negative indices that may provide a foundation for new adaptive optical materials in sensing, solar, stealth, and display applications.

Bio of Jennifer Dionne:

Jennifer Dionne is an associate professor of Materials Science and Engineering at Stanford. Jen received her Ph. D. in Applied Physics at the California Institute of Technology, advised by Harry Atwater, and B.S. degrees in Physics and Systems & Electrical Engineering from Washington University in St. Louis. Prior to joining Stanford, she served as a postdoctoral researcher in Chemistry at Berkeley, advised by Paul Alivisatos. Jen's research develops new nano and optical materials for applications ranging from high-efficiency energy conversion and storage to bioimaging and manipulation. This research has led to demonstration of negative refraction at visible wavelengths, design of optical tweezers for nano-specimen trapping, demonstration of a metamaterial fluid, and synthesis of high-efficiency and active upconverting materials. Most recently, Jen has developed in situ techniques to visualize chemical transformations and light-matter interactions with nanometer-scale spatial resolution. She is the recipient of the Adolph Lomb Medal (2016), Sloan Foundation Fellowship (2015), the Presidential Early Career Award for Scientists and Engineers (2014), and the inaugural Kavli Early Career Lectureship in Nanoscience (2014), and was recently featured on Oprah's list of "50 Things that will make you say Wow!" When not in the lab, Jen enjoys teaching three classes (Materials Chemistry, Optoelectronics, and Science of the Impossible), exploring the intersection of art and science, and cycling the latest century.

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