Circular Dichroism - Hierarchically Assembled Bowtie Hybrid Metamaterials with a Chirality Continuum

Описание: In this webinar, we will explore such structures in the form of nanostructured microparticles with anisotropic bowtie shape and widely tunable twist angle, pitch, width, thickness, and length. The self-limited assembly of the bowties enables high synthetic reproducibility, size monodispersity, and computational predictability of their geometries for different assembly conditions. The bowtie nanoassemblies display multiple strong circular dichroism peaks originating from absorptive and scattering phenomena. Unlike classical chiral molecules, these particles display a continuum of chirality measures that correlate exponentially with the spectral positions of the circular dichroism peaks. We will further demonstrate how these bowtie particles with variable polarization rotation were used to print photonically active metasurfaces with spectrally tunable positive/negative polarization signatures for light detection and ranging (LIDAR) devices. [1]

0:00 Introduction
0:19 Nature detects friend or foe using polarized light
4:13 Uniqueness of bowties (Cd + Cystine)
6:07 Levels of hierarchy
7:47 What is level 1 made out of?
11:27 Multiscale Synthesis and Characterization
13:47 Understanding the chiroptical response
26:34 Monte-Carlo Modeling of Self-Assembly
28:38 Charged building blocks and interaction between them
34:59 Chirality Continuum
36:11 Structure Property Relationships: Toward Inverse Design
37:17 Chirality Measures