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arXiv 1909.06217physics.optics
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圆二色性模分裂及其与腔等离子体激元增强的关系

Circular dichroism mode splitting and bounds to its enhancement with cavity-plasmon-polaritons

Denis G. Baranov, Battulga Munkhbat, Nils Odebo Länk, Ruggero Verre, Mikael Käll, Timur Shegai

摘要:

区分不同旋向手性分子的能力对于化学和生命科学具有重要意义。由于大多数相关手性分子在UV区域具有其手性跃迁,因此检测其圆二色性(CD)信号与在该光谱范围内进行光学测量的实际实验挑战相关联。为了解决这个问题,在这里,我们研究的可能性转移CD信号的模型手征介质达到强耦合制度与光学微腔。具体来说,我们表明,通过强耦合手性等离子体纳米粒子的非手性法布里-珀罗微腔可以印上的混合模式分裂,强耦合系统的标志,耦合系统的CD光谱,从而有效地转移模型系统的手征共振到较低的能量。我们首先预测的效果,使用解析传输矩阵法以及数值时域有限差分(FDTD)模拟。此外,我们证实了理论预测的有效性,在涉及手性等离子体纳米粒子耦合到法布里-珀罗微腔的原理验证实验。

英文摘要:

The ability to differentiate chiral molecules of different handedness is of great importance for chemical and life sciences. Since most of the relevant chiral molecules have their chiral transitions in the UV region, detecting their circular dichroism (CD) signal is associated with practical experimental challenges of performing optical measurements in that spectral range. To address this problem, here, we study the possibility of shifting CD signal of a model chiral medium by reaching the strong coupling regime with an optical microcavity. Specifically, we show that by strongly coupling chiral plasmonic nanoparticles to a non-chiral Fabry-Pérot microcavity one can imprint the hybrid mode splitting, the hallmark of strongly coupled systems, on the CD spectrum of the coupled system and thereby effectively shift the chiral resonance of the model system to lower energies. We first predict the effect using analytical transfer-matrix method as well as numerical finite-difference time-domain (FDTD) simulations. Furthermore, we confirm the validity of theoretical predictions in a proof-of-principle experiment involving chiral plasmonic nanoparticles coupled to a Fabry-Pérot microcavity.

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