Breaking Lorentz reciprocity to overcome the time-bandwidth limit in physics and engineering

A century-old tenet in physics and engineering asserts that any type of system, having bandwidth Δω, can interact with a wave over only a constrained time period Δ inversely proportional to the bandwidth (Δ ·Δω ~ 2π). This law severely limits the generic capabilities of all types of resonant and wav...

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Vydané v:	Science (American Association for the Advancement of Science) Ročník 356; číslo 6344; s. 1260
Hlavní autori:	Tsakmakidis, K L, Shen, L, Schulz, S A, Zheng, X, Upham, J, Deng, X, Altug, H, Vakakis, A F, Boyd, R W
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	United States 23.06.2017
ISSN:	1095-9203, 1095-9203
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Popis
Shrnutí:	A century-old tenet in physics and engineering asserts that any type of system, having bandwidth Δω, can interact with a wave over only a constrained time period Δ inversely proportional to the bandwidth (Δ ·Δω ~ 2π). This law severely limits the generic capabilities of all types of resonant and wave-guiding systems in photonics, cavity quantum electrodynamics and optomechanics, acoustics, continuum mechanics, and atomic and optical physics but is thought to be completely fundamental, arising from basic Fourier reciprocity. We propose that this "fundamental" limit can be overcome in systems where Lorentz reciprocity is broken. As a system becomes more asymmetric in its transport properties, the degree to which the limit can be surpassed becomes greater. By way of example, we theoretically demonstrate how, in an astutely designed magnetized semiconductor heterostructure, the above limit can be exceeded by orders of magnitude by using realistic material parameters. Our findings revise prevailing paradigms for linear, time-invariant resonant systems, challenging the doctrine that high-quality resonances must invariably be narrowband and providing the possibility of developing devices with unprecedentedly high time-bandwidth performance.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1095-9203 1095-9203
DOI:	10.1126/science.aam6662