Center for Nanoscale Systems
The Center for Nanoscale Systems (CNS) is a shared-use core facility at Harvard University. Our scientific focus is the study, design and fabrication of nanoscale structures and their integration into large and complex interacting systems.
A thinner, flatter lens
Curved lenses like those in cameras or telescopes are stacked to reduce distortions and clarify images. That’s why high-powered microscopes are so big and telephoto lenses so long. While lens technology has improved, it is still difficult to make a compact and thin lens.
But researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have demonstrated the first flat — or planar — lens that works highly efficiently within the visible spectrum of light, covering the whole range of colors from red to blue.
CNS Seminar, “Engineering Quantum Confinement in Semiconducting van der Waals Heterostructure,” Professor Philip Kim
12:00pm, Pierce Hall 209 (NOTE ROOM CHANGE!) The recent development of research in 2-dimensional (2D) semiconducting materials based on semiconducting transition metal dichalcogenides (TMDCs) enables a novel engineered quantum structures. Employing functional interface realized in high-quality van der Waals (vdW) heterostructures, gate-defined electronic systems can be fabricated. In particular, spatially confined quantum structures in TMDC can offer unique valley-spin features, holding the promises for novel mesoscopic systems, such as valley-spin qubits. In this presentation, we report the fabrication of the gate-defined quantum structures formed in atomically thin TMDC heterostructures, exhibiting quantum transport phenomena and optoelectronic processes. For this work, we have developed several experimental innovations, including stamping the TMDC channel to the local gate electrodes, encapsulation of channel in 2D dielectrics, and light illumination at low temperatures, which lead to a vast improvement in the quality of the TMDC heterostructures. We report several unusual quantum transport phenomena in the TMDC heterostructures, such as the quantized conductance in gate-tunable quantum confinement in a quantum point contacts and single electron charging with tunable tunnel-coupling. We also report tunable optoelectronic processes in confined quantum structures in 2D TMDCs.[+MORE]
CNS Seminar: "Observation of Metallic Hydrogen" - LISE 303
Nov 08 12:00 pm - 1:00 pm
Professor Isaac Silvera, Department of Physics, Harvard University
11 Oxford Street, Cambridge, MA, United States
CNS Seminar: "Laser Produced Plasma EUV Source for Semiconductor Lithography Applications" - LISE 303
Nov 02 12:00 pm - 1:00 pm
Dr. Michael Purvis, EUV Source Program at AMSL
11 Oxford St, Cambridge, MA, United States