Plasmonic Superchiral Lattice Resonances in the Mid-Infrared,ACS Photonics

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Plasmonic Superchiral Lattice Resonances in the Mid-Infrared
ACS Photonics ( IF 6.5 ) Pub Date : 2020-08-19 , DOI: 10.1021/acsphotonics.0c00161
Francesco Mattioli ₁ , Giuseppe Mazzeo ₂ , Giovanna Longhi _{2,

3} , Sergio Abbate _{2,

3} , Giovanni Pellegrini ₄ , Erika Mogni ₄ , Michele Celebrano ₄ , Marco Finazzi ₄ , Lamberto Duò ₄ , Chiara Giuseppina Zanchi ₅ , Matteo Tommasini ₅ , Marialilia Pea ₁ , Sara Cibella ₁ , Raffaella Polito ₆ , Filippo Sciortino ₆ , Leonetta Baldassarre ₆ , Alessandro Nucara ₆ , Michele Ortolani ₆ , Paolo Biagioni ₄

Affiliation

Recent efforts in the field of surface-enhanced spectroscopies have focused on the paradigm of “superchirality”, entailing the engineering of the local electromagnetic fields to boost the enantiospecific interaction between light and chiral molecules. In this framework, approaches based on both metallic and dielectric nanostructures have been proposed and have also recently been extended to vibrational circular dichroism in the mid-infrared. In this work, we design, fabricate, and characterize a lattice of chiral plasmonic slits featuring enhanced chiral fields in the mid-infrared. We exploit collective lattice resonances to further enhance the local intensity and to generate sharp features in the circular dichroism spectra of the platform. Such features are ideally suited to test the superchiral coupling with the vibrational resonances of chiral molecules.

中文翻译：

中红外等离子体超手性晶格共振

表面增强光谱学领域的最新努力集中在“超手性”范式上，这需要对局部电磁场进行工程设计以增强光与手性分子之间的对映体特异性相互作用。在这种框架下，已经提出了基于金属和介电纳米结构的方法，并且最近还扩展到了中红外振动圆二色性。在这项工作中，我们设计，制造和表征了手性等离子狭缝的晶格，其特征在于增强了中红外的手性场。我们利用集体晶格共振来进一步增强局部强度，并在平台的圆二色性光谱中产生鲜明的特征。

更新日期：2020-10-21

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