Oleg Selig
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View article: Experimental investigation of new optical antenna designs found by a genetic algorithm
Experimental investigation of new optical antenna designs found by a genetic algorithm Open
Most currently studied optical antenna geometries are based on radio wave antenna designs. However, material properties at optical frequency largely differ from the perfect metal case at radio frequencies. Recently, evolutionary algorithms…
View article: Rotational Cation Dynamics in Metal Halide Perovskites: Effect on Phonons and Material Properties
Rotational Cation Dynamics in Metal Halide Perovskites: Effect on Phonons and Material Properties Open
The dynamics of organic cations in metal halide hybrid perovskites (MHPs) have been investigated using numerous experimental and computational techniques because of their suspected effects on the properties of MHPs. In this Perspective, we…
View article: Temperature-Induced Collapse of Elastin-like Peptides Studied by 2DIR Spectroscopy
Temperature-Induced Collapse of Elastin-like Peptides Studied by 2DIR Spectroscopy Open
Elastin-like peptides are hydrophobic biopolymers that exhibit a reversible coacervation transition when the temperature is raised above a critical point. Here, we use a combination of linear infrared spectroscopy, two-dimensional infrared…
View article: Plasmonic nanoantenna design and fabrication based on evolutionary optimization
Plasmonic nanoantenna design and fabrication based on evolutionary optimization Open
Nanoantennas can tailor light-matter interaction for optical communication, sensing, and spectroscopy. Their design is inspired by radio-frequency rules which partly break down at optical frequencies. Here we find unexpected nanoantenna de…
View article: Organic Cation Rotation and Immobilization in Pure and Mixed Methylammonium Lead-Halide Perovskites
Organic Cation Rotation and Immobilization in Pure and Mixed Methylammonium Lead-Halide Perovskites Open
Three-dimensional lead-halide perovskites have attracted a lot of attention due to their ability to combine solution processing with outstanding optoelectronic properties. Despite their soft ionic nature these materials demonstrate a surpr…
View article: Ultrasensitive nonlinear vibrational spectroscopy of complex molecular systems
Ultrasensitive nonlinear vibrational spectroscopy of complex molecular systems Open
In this work we use polarization-resolved pump-probe and two-dimensional infrared (2DIR) spectroscopy to study the conformational changes and the vibrational population dynamics in complex molecular systems. In the first part of this thesi…
View article: Impact of local-field effects on the plasmonic enhancement of vibrational signals by infrared nanoantennas
Impact of local-field effects on the plasmonic enhancement of vibrational signals by infrared nanoantennas Open
We have developed an analytical model that provides a mechanistic description of the plasmonic enhancement of vibrational signals by infrared nanoantennas. Our treatment is based on a coupled-point-dipole model which considers the interact…