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IMAGE: a, Zero-index PhC slab without BICs. A photonic dipole mode forming the zero index results in out-of-plane radiation, dramatically increasing the propagation loss of the material. b, Zero-index PhC slab. view more
Credit: by Tian Dong, Jiujiu Liang, Philip Camayd-Muñoz, Yueyang Liu, Haoning Tang, Shota Kita, Peipei Chen, Xiaojun Wu, Weiguo Chu, Eric Mazur, and Yang Li
A refractive index of zero induces a wave vector with zero amplitude and undefined direction. Therefore, light propagating inside a zero-index medium does not accumulate any spatial phase advance, resulting in perfect spatial coherence. Such coherence brings several potential applications, including arbitrarily shaped waveguides, phase-mismatch-free nonlinear propagation, large-area single-mode lasers, and extended super radiance. A promising platform to achieve these applications is an integrated Dirac-cone material that features an impedance-matched zero index. However, although this pla
December 21, 2020
Big new report from a Princeton University group released last week.
The report presents 5 alternative scenarios, none of them designated as the “right” way to go, but each with its own set of challenges. Some scenarios include technology like carbon capture and storage, as well as nuclear, and one scenario is “renewables only”, with no exotic technologies.
One important finding, none of the scenarios envisions spending more than 3 percent of GDP above the reference (no action) case – and all would be less than that, if prices for fossil fuels rise.
With a massive, nationwide effort the United States could reach net-zero emissions of greenhouse gases by 2050 using existing technology and at costs aligned with historical spending on energy, according to a study led by Princeton University researchers.
Credits: Photo courtesy Evelyn Hu.
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Harvard University Professor Evelyn Hu opened the 2020 Mildred S. Dresselhaus Lecture with a question: In an imperfect world, is perfection a necessary precursor for transformative advances in science and engineering?
Over the course of the next hour, for a virtual audience of nearly 300, the Tarr-Coyne Professor of Applied Physics and Electrical Engineering at the John A. Paulson School of Engineering and Applied Sciences at Harvard University argued that, at the nanoscale, there must be more creative ways to approach materials. By looking at what nature gives us in terms of electron energy levels, phonons, and a variety of processes, Hu said, scientists can re-engineer the properties of materials.
Big but affordable effort needed for America to reach net-zero emissions by 2050, study shows phys.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from phys.org Daily Mail and Mail on Sunday newspapers.