Controlling third harmonic generation with gammadion-shaped chiral metamaterials

Zhang, Chi; Li, Zhiqin; Yang, Xin; Chen, Zhuo; Wang, Zhenlin

doi:10.1063/1.4971375

Cited by 8 publications

(10 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other nonlinear optical processes can be used to study chirality or characterize metallic nanostructures such as sum frequency generation, coherent anti‐Stokes Raman spectroscopy and higher harmonic generation . Many of these nonlinear optical techniques have been developed during the study of chiral molecules .…”

Section: Nonlinear Chiropticsmentioning

confidence: 99%

See 1 more Smart Citation

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

Collins

Kuppe

Hooper

et al. 2017

Advanced Optical Materials

301

246

View full text Add to dashboard Cite

Throughout the 19th and 20th century, chirality has mostly been associated with chemistry. However, while chirality can be very useful for understanding molecules, molecules are not well suited for understanding chirality. Indeed, the size of atoms, the length of molecular bonds and the orientations of orbitals cannot be varied at will. It is therefore difficult to study the emergence and evolution of chirality in molecules, as a function of geometrical parameters. By contrast, chiral metal nanostructures offer an unprecedented flexibility of design. Modern nanofabrication allows chiral metal nanoparticles to tune the geometric and optical chirality parameters, which are key for properties such as negative refractive index and superchiral light. Chiral meta/nano‐materials are promising for numerous technological applications, such as chiral molecular sensing, separation and synthesis, super‐resolution imaging, nanorobotics, and ultra‐thin broadband optical components for chiral light. This review covers some of the fundamentals and highlights recent trends. We begin by discussing linear chiroptical effects. We then survey the design of modern chiral materials. Next, the emergence and use of chirality parameters are summarized. In the following part, we cover the properties of nonlinear chiroptical materials. Finally, in the conclusion section, we point out current limitations and future directions of development.

show abstract

Section: Nonlinear Chiropticsmentioning

confidence: 99%

“…Symmetry selection rules for the THG of nanostructures coated with PFO have been investigated with structures of various symmetries . Theoretical studies of metal‐insulator‐metal chiral gammadion nanostructures predicted a strong THG‐CD response, which could be used in the design of a Fresnel zone plate …”

Section: Nonlinear Chiropticsmentioning

confidence: 99%

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

Collins

Kuppe

Hooper

et al. 2017

Advanced Optical Materials

301

246

View full text Add to dashboard Cite

show abstract

“…By combining a relatively small set of full wave simulations with our MDL approach, the design space can be explored in fine detail at a fraction of the computational cost. Experimentally and theoretically, a number of planar chiral geometries have been investigated and demonstrate huge CD signals including spirals [46][47][48][49], gammadions [50][51][52][53][54], L-shaped [55], Γ-shaped [12], and z-shaped [3] nanostructures. For the purpose of our demonstration of the MDL model, we adopt a variation of our YNP metastructure defined by double-top YNPs with radius, thickness, and gap distance R 0 , t 1 , and d , respectively (see inset in Fig.…”

Section: Chiral Metamaterials Model and Formalismmentioning

confidence: 99%

Multitask deep-learning-based design of chiral plasmonic metamaterials

et al. 2020

View full text Add to dashboard Cite

The field of chiral plasmonics has registered considerable progress with machine-learning (ML)-mediated metamaterial prototyping, drawing from the success of ML frameworks in other applications such as pattern and image recognition. Here, we present an end-to-end functional bidirectional deep-learning (DL) model for three-dimensional chiral metamaterial design and optimization. This ML model utilizes multitask joint learning features to recognize, generalize, and explore in detail the nontrivial relationship between the metamaterials’ geometry and their chiroptical response, eliminating the need for auxiliary networks or equivalent approaches to stabilize the physically relevant output. Our model efficiently realizes both forward and inverse retrieval tasks with great precision, offering a promising tool for iterative computational design tasks in complex physical systems. Finally, we explore the behavior of a sample ML-optimized structure in a practical application, assisting the sensing of biomolecular enantiomers. Other potential applications of our metastructure include photodetectors, polarization-resolved imaging, and circular dichroism (CD) spectroscopy, with our ML framework being applicable to a wider range of physical problems.

show abstract

“…At the Fano resonance wavelength, chiroptical effects were observed which can be modulated by adjusting the inter-particle distance and rotation angle. Figure 1b shows another type of planar metal-insulator-metal (MIM) multilayered chiral nanostructure with Gammadion-shape [10]. The nanostructures with opposite mirror symmetry show reversed circular dichroism effect for the third harmonic generation.…”

Section: Design and Fabrication Of Chiral Plasmonic Nanostructuresmentioning

confidence: 99%

Chiral plasmonics and enhanced chiral light-matter interactions

Wen

Gérard

et al. 2019

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

Chirality, which describes the broken mirror symmetry in geometric structures, exists macroscopically in our daily life as well as microscopically down to molecular levels. Correspondingly, chiral molecules interact differently with circularly polarized light exhibiting opposite handedness (left-handed and right-handed). However, the interaction between chiral molecules and chiral light is very weak. In contrast, artificial chiral plasmonic structures can generate "super-chiral" plasmonic near-field, leading to enhanced chiral light-matter (or chiroptical) interactions. The "super-chiral" near-field presents different amplitude and phase under opposite handedness incidence, which can be utilized to engineer linear and nonlinear chiroptical interactions. Specifically, in the interaction between quantum emitters and chiral plasmonic structures, the chiral hot spots can favour the emission with a specific handedness. This article reviews the state-of-the-art research on the design, fabrication and chiroptical response of different chiral plasmonic nanostructures or metasurfaces. This review also discusses enhanced chiral light-matter interactions that are essential for applications like chirality sensing, chiral selective light emitting and harvesting. In the final part, the review ends with a perspective on future directions of chiral plasmonics.

show abstract

Controlling third harmonic generation with gammadion-shaped chiral metamaterials

Cited by 8 publications

References 34 publications

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

Multitask deep-learning-based design of chiral plasmonic metamaterials

Chiral plasmonics and enhanced chiral light-matter interactions

Contact Info

Product

Resources

About