Acceleration of Subwavelength Polaritons by Engineering Dielectric-Metallic Substrates,ACS Photonics

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Acceleration of Subwavelength Polaritons by Engineering Dielectric-Metallic Substrates
ACS Photonics ( IF 6.5 ) Pub Date : 2020-05-19 , DOI: 10.1021/acsphotonics.0c00563
Flávio H. Feres _{1,

2} , Rafael A. Mayer _{1,

3} , Ingrid D. Barcelos ₁ , Raul O. Freitas ₁ , Francisco C. B. Maia ₁

Affiliation

By synchrotron infrared nanospectroscopy, we demonstrate modulation of momentum and group velocity of subdiffractional hyperbolic phonon-polaritons (HP²), in hexagonal boron nitride nanocrystals, by varying the SiO₂ film thickness in the hBN/SiO₂/Au heterostructure. We reveal acceleration of the HP² pulse in a hBN/(SiO₂ wedge)/Au heterostructure with gradient of the SiO₂ thickness. The acceleration is explained by a semiclassical modeling considering the polariton pulse as a free quantum particle with effective mass dependent on its group velocity. In quantitative agreement with simulations and semiempirical analysis, the modeling predicts an average acceleration of 1.5 × 10¹⁸ m·s^–2 close to that of ∼ 1.45 × 10¹⁸ m·s^–2 obtained from experimental inputs. From the fundamental aspect, the polariton acceleration allows discussing the undulatory-corpuscular behavior of polariton quasi-particles. The acceleration induced by the wedge is a general effect that can provide for control of the polariton pulse dynamics, which is compelling for future polaritonic devices.

中文翻译：

工程介电金属基底对亚波长极化子的加速

通过同步加速器红外纳米光谱，我们通过改变hBN / SiO ₂ / Au异质结构中的SiO ₂膜厚度，证明了六方氮化硼纳米晶体中亚衍射双曲线声子-极化子（HP ²）的动量和群速度的调制。我们揭示了hBN /（SiO ₂楔形）/ Au异质结构中HP ²脉冲的加速，其中SiO ₂厚度具有梯度。加速度是通过半经典模型来解释的，该模型将极化子脉冲视为自由量子粒子，其有效质量取决于其群速度。在与仿真和半经验分析定量一致的基础上，该模型预测平均加速度为1.5×10¹⁸ m·s ^–2接近从实验输入获得的〜1.45×10 ¹⁸ m·s ^–2。从根本上讲，极化子加速度允许讨论极化子准粒子的起伏的粒子运动。楔形感应的加速度是一种通用效应，可以提供对极化子脉冲动力学的控制，这对于将来的极化子设备来说非常引人注目。

更新日期：2020-05-19

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