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- W2745132203 abstract "Conventional sensors based on devices called optical resonators have fundamentally limited sensitivity. Careful engineering has been used to overcome this constraint, opening the door to ultraprecise sensing. See Letters & Recent insights into open (non-Hermitian) physical systems have led to a new range of optical systems in which, counter-intuitively, loss is introduced. By careful tuning of loss and gain, certain degeneracies called 'exceptional points' emerge, which have intriguing properties that can be harnessed, for example, in new types of lasers, one-way optical waveguides and topological effects. Two papers in this issue demonstrate the high sensitivity of such non-Hermitian degeneracies to external perturbations, which can be used for precision sensing and detection. Weijian Chen et al. report sensing of nanoparticles with exceptional points generated in a silicon dioxide micro-toroid resonator. Hossein Hodaei et al. generated a higher-order exceptional point by coupling three micro-rings made from a semiconductor laser material. This third-order exceptional point has an even higher, cube-root (rather than square-root) dependence on perturbations. The two papers together provide a new route to ultraprecise chip-based sensing systems." @default.
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- W2745132203 date "2017-08-10" @default.
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- W2745132203 title "Optical sensing gets exceptional" @default.
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- W2745132203 doi "https://doi.org/10.1038/548161a" @default.
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