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MSE Thesis Defense: “Imaginary-Index-Driven Programmable Integrated Photonics for Optical Computing and Networking”

Zoom

Photonics serves as the backbone of modern information infrastructure, transmitting and processing data at unparalleled speeds with minimal energy consumption by harnessing the inherent parallelism, high-frequency operation, and expansive bandwidths. In the past decade, the surging advancements of artificial intelligence has revolutionized the traditional definition of computing algorithms. By bridging the gap between optical hardware and software-defined functionality, programmable integrated […]

MSE Seminar: “Color From Colorless Materials: Harnessing Multi-reflection Interference in Microstructures”

Wu and Chen Auditorium (Room 101), Levine Hall 3330 Walnut Street, Philadelphia, PA, United States

Many of the colors found in nature, such as those of iridescent, color-shifting organisms like beetles, butterflies, and birds, are structural colors. Structural coloration is often generated by optical interference occurring within nanoscale periodic structures, like diffraction gratings, photonic crystals, or thin films. In these cases, the periodicity of the structure is similar to the […]

MSE Seminar “Shaping a Soft Future”

Wu & Chen Auditorium

Existing devices—such as cell phones, computers, and robots – are made from rigid materials, which is in direct contrast to the soft materials that compose the human body. In this talk, I will discuss several topics related to studying and harnessing soft materials within the context of creating devices with tissue like properties. Liquid metal: Gallium-based […]

MEAM Seminar: “Engineering Mechanics of Architected Hard-Soft Composites: Experiment, Simulation, and Theory”

Wu and Chen Auditorium (Room 101), Levine Hall 3330 Walnut Street, Philadelphia, PA, United States

Enhancing the resistance of human-made brittle materials to fracture is challenging due to the limited microstructural toughening mechanisms. This seminar makes a case for engineering toughening mechanisms in brittle materials by developing purposeful architected arrangements of material inspired by natural systems. Experimental fracture mechanics in hard-soft (cementitious-elastomeric) ‘Nacre-like’ composites based on the tabulated brick-and-mortar arrangement […]

MSE Seminar: “Kagome Metals and Their Unusual Electronic Properties”

Wu and Chen Auditorium (Room 101), Levine Hall 3330 Walnut Street, Philadelphia, PA, United States

In this talk, I will discuss new inroads in the study of electronic order within classes of metals built from kagome lattices or networks of corner sharing triangles.  The electronic band structures of these compounds are known to host a series of features such as Dirac crossings, saddle points, and flat bands at select carrier […]

MSE Seminar: “Quantum Materials: A View from the Lattice”

Wu & Chen Auditorium

Connecting theoretical models for exotic quantum states to real materials is a key goal in quantum materials science.  The structure of the crystalline lattice plays a foundational role in this pursuit in the subfield of quantum material synthesis.  We here revisit this long-standing perspective in the context low dimensional emergent electronic phases of matter, including […]

David P. Pope Distinguished Lecture: “Supersonic Collisions of Microparticles on Metal: In-Situ Studies at the Nanosecond and Micrometer Scales” 

Wu and Chen Auditorium (Room 101), Levine Hall 3330 Walnut Street, Philadelphia, PA, United States

There are many situations in which small particles impact metals at high speeds, even above the speed of sound. Sometimes these are unintentional (as for foreign object damage or micrometeorite strikes), and sometimes they occur by design (as for surface treatment processes like abrasive spray, peening, or spray coatings). The fundamental physics behind supersonic impacts, […]

MSE Seminar: “Luminescent Photonic Metamaterials and Devices From THz to Optical Frequencies”

Wu and Chen Auditorium (Room 101), Levine Hall 3330 Walnut Street, Philadelphia, PA, United States

A crucial yet unavailable component in high-performance photonic integrated circuits (ICs) and other chip-scale photonic systems is an on-chip light source that is efficient, functional, IC-compatible, and electronically addressable. In this talk, I will cover several types of on-chip sources, including perovskite microlasers and luminescent hyperbolic metamaterials, topologically protected microlasers on the III-V platform, as […]

MEAM Ph.D. Thesis Defense: “Tribosintering of Metal Oxide Nanocrystals”

Glandt Forum, Singh Center for Nanotechnology 3205 Walnut Street, Philadelphia, PA, United States

Machinery relies on lubrication to regulate friction and wear at contacting interfaces. As lubricants become less viscous to save energy and cost, and as new technologies like electric vehicles operate in harsher conditions, the risk of surface-initiated failure grows. We show that metal oxide nanocrystals (NCs) dispersed in lubricants form protective coatings, or tribofilms, in […]

MSE Seminar: “Nano to Mesoscale: Structure, Composition, and Transport Processes in Human Dental Enamel”

Wu and Chen Auditorium (Room 101), Levine Hall 3330 Walnut Street, Philadelphia, PA, United States

Mineralized tissues are paradigmatic hierarchical materials that reap synergy from structural and compositional gradients at multiple length scales in ways that are challenging to reproduce by conventional means. My laboratory studies the formation, functional properties, and degradation of mineralized tissues. We use model systems ranging from single crystalline endoskeletal elements deposited by single cells to […]