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Pumped quantum systems: immersion fluids of the future?

机译:泵浦量子系统:未来的浸没液?

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摘要

Quantum optical techniques may yield immersion fluids with high indices of refraction without absorption. We describe one such technique in which a probe field experiences a large index of refraction with amplification rather than absorption, and examine its practicality for an immersion lithography application. Enhanced index can be observed in a three-level system with a tunable, near-resonant, coherent probe and incoherent pump field that inverts population of the probe transition. This observation contradicts the common belief that large indices of refraction are impossible without absorption, however it is well in accord with existing electromagnetic theory and practice. Calculations show that a refractive index >> 2 is possible with practical experimental parameters. A scheme with an incoherent mixture of pumped and unpumped atoms is also examined, and is seen to have a lower refractive index (~2) accompanied by neither gain nor loss.
机译:量子光学技术可以产生具有高折射率而没有吸收的浸没流体。我们描述了一种这样的技术,在该技术中,探测场会经历大的折射率,而不是被吸收,而是被放大,并检验其在浸没式光刻应用中的实用性。可以在具有可调谐,近共振,相干探头和不相干泵浦场的三级系统中观察到增强的指数,这会颠倒探头转换的数量。这一观察结果与普遍的观点相矛盾,即人们不吸收就不可能获得大的折射率,但是这与现有的电磁理论和实践完全吻合。计算表明,在实际实验参数下,折射率>> 2是可能的。还检查了具有泵浦和未泵浦原子的不相干混合物的方案,发现该方案具有较低的折射率(〜2),且既无增益也无损耗。

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