Ultrafast nonlinear spectroscopy
Ultrafast nonlinear spectroscopy
Ultrafast nonlinear spectroscopy and microscopy
Spectroscopy with submolecular resolution using inelastic STM
Condensed Matter Physics
Non-linear optical (CARS) microscopy
Energy Science; Theory & Computation
Interfacial & Bioanalytical Chemistry (IBAC) photochemical properties
Surface-Enhanced Raman Spectroscopy
Condensed Matter Physics
Time-resolved scannning tunneling microscopy, Single molecule Raman Spectroscopy, Ultrafast electron dynamics in plasmonic materials
Ultrafast nonlinear spectroscopy, multidimensional infrared spectroscopy and nonlinear microscopy.
Studying the use of optical forces to investigate light-matter interaction at the single molecule level. Development of novel Tip Enhanced Raman (TERS) techniques such as stimulated-TERS and their application towards single molecule spectroscopy. Research areas of interest: Near-field optics, plasmonics, scanning probe microscopy and spectroscopy.
Understanding orientation dependent chirality of single metallic nano-dimers invoking magnetic dipole and electric quadrupole to SERS effect.
My research uses surface-enhanced ultrafast nonlinear spectroscopies to study the effect of plasmonic enhancement on ultrafast dynamics in nanomaterials relevant to photovoltaics and photocatalysis. The goal is to push the sensitivity of these measurements toward the single molecule regime.
My research is focused on understanding the dynamical behavior of molecular systems, with special attention to the areas of clean energy, human health, and technology. The principle research strategies I employ include cutting-edge quantum chemical computational techniques as well as analytical theory.
My research interests involve the method development for investigating the plasmonic response of metallic nanoparticles in quantum size regime and the plasmon-enhanced nonlinear spectroscopy.
The dynamics of surface plasmons with sub-wavelength spatial resolution and sub-femtosecond temporal precision by using PEEM and LEEM.
The goal of my research is to tackle challenging problems in the general area of condensed matter theory, using electromagnetic simulation tools and developing theoretical models for the study of the optical response of metallic nanostructures, plasmonic, excitonic, and hybrid systems.
First-principles calculation on the environment and energy (three way catalysts, fuel cell and gas sensor) related material and Nano-materials
Ultrafast Nonlinear Spectroscopy, Nonlinear microscopy, Surface Enhanced Nonlinear spectroscopy
My goal in the Van Duyne group is to use ultrafast spectroscopy to investigate vibrational dynamics of chemical systems deposited on nanoparticle substrates that provide surface enhancement effects.
Theoretical Condensed Matter Physics
My research interests include developing ways to model time- and energy-resolved two-photon photoemission experiments on metal surfaces as well as metal nanoparticles.
I study the spectra and electron dynamics in surface plasmon enhanced photocatalysis with time-resolved two-photon photoemission spectroscopy.
Construction and characterization of nanoscale Au plasmonic devices for the study of ultrafast electron transport processes and magnetic field enhancement, using a combination of photolithography, electrochemical, and focused ion beam (FIB) milling fabrication techniques.
Single molecule microscopy and spectroscopy.
Theory and method development as it relates to light/matter interactions. Primarily concerned with the response of molecules coupled to plasmonic nanoparticles.
My research involves investigating the coupling of light to surface plasmon polaritons via tailored, transient optical gratings. This coupling scheme is then utilized to remotely launch surface plasmons at nanojunctions to drive and monitor space-time resolved chemistry.
Ultrafast photoemission electron microscopy of plasmonic nanostructures
STM studies of coupling in QD oligomers, Inductive effect of organic ligands for quantum dots.
Manipulation of nanoparticles to fabricate enhanced magnetic field structures, electrical characterization of conductive polymers, and tip-enhanced raman spectroscopy by utilizing scanning electron microscopy and a nanomanipulation device.
I am doing force detection of sample optical response using AFM.
Studying photo-induced force microscopy and spectroscopy by combining atomic force microscope with optical microscope. Key words: chemical imaging of a single molecule, optical binding.
Optical and electronic studies of Quantum dot assemblies. Quantum dot field effect transistors and solar cells. Optical and mechanical manipulation of nanoscale objects.
Studying photo-induced force microscopy, combining mechanical force detection with optical microscopy.
Study of single molecule dynamics with sub-angstrom spatial resolution and ultrafast temporal resolution using a femtosecond laser-coupled scanning tunneling microscope.
Investigating cleaning techniques for gold nanoparticles to optimize thin film deposition and development of a gold nanocrescent/alumina substrate for surface enhanced spectroscopy
Single Molecule Spectroscopy and Microscopy
My research involves building plasmonic nanocrystal dimer SERS platform for study of charge transfer.
My research involves pairing plasmonic enhancement with excited state vibrational spectroscopies. I am interested in integrating ultrafast time resolution with nanoscale surface characterization techniques. The goal of this project is to study site-specific dynamics of materials relevant to photovoltaic devices.
My research focuses on understanding the fundamental physics behind plasmonically-enhanced coherent Raman scattering (CRS) spectroscopies from a combined experiment-theory approach. When CRS events are plasmonically-enhanced, unusual spectral behavior is observed due to the combination of plasmonically-enhanced optical fields with the coupled driven-oscillators of the molecule-plasmon-light interactions. Using a variety of experimental CRS techniques and theoretical analytic models for light-matter interaction in plasmonically-enhanced CRS, we are beginning to understand the physics at a deeper level.
Research and development of a Radio Frequency Scanning Tunneling Microscope(RF-STM) with the capability to detect photon induced tunneling current for the purposes of combining femtosecond temporal resolution and sub-angstrom spatial resolution.
My research concerns incorporating femtosecond temporal resolution with nanoscale surface characterization. Tip-enhanced Raman spectroscopy (TERS) is a technique through which the chemical properties of surface-bound molecules can be probed spectroscopically with spatial resolution on the order of single nanometers. While TERS is typically poor in temporal resolution, we have made advances toward the integration of ultrafast spectroscopic techniques, which will allow us to spatially resolve ultrafast surface dynamics relevant to many technologies.
My research focuses on the self-assembly of Au nanoparticle and Ag nanocube dimer structures to produce localized fields that will lead to enhanced Raman spectroscopy signals.
I propose to explore the rectifying abilities of DBDT for implementation in solar energy technology. Major characterization methods include STM and AFM experiments.
My research focuses on investigating the Raman scattering process of plasmonic nanoparticles, typically consisting of metallic nanospheres functionalized with a molecular Raman reporter. Of particular interest are considerations such as the chirality of the plasmons and the interference effects that arise between the scattering processes of the metal and molecule. These phenomena are studied via polarization-resolved and intensity-dependent surface enhanced Raman spectroscopy.
My research currently involves photostability studies of four-waving mixing substrates for surface-enhanced stimulated raman spectroscopy (SE-FSRS) and surface-enhanced coherent raman scattering (SE-CARS). We have observed novel spectral features that can be explained by plasmon-driven hot electron chemistry and are working towards dynamic control of these charge transfer processes by utilizing increased temporal resolution. I am also pursuing theoretical calculations of non-equilibrium electron dynamics in order to gain insight into rapid thermalization processes occurring within experimental ultrafast systems.
I use a scanning tunneling microscope to study single molecule electron dynamics and Tip Enhanced Raman Spectroscopy. I am also investigating an intrinsically conductive metalorganic polymer for its use as molecular wires.
Studying photo-induced force microscopy. Analytical modeling and full wave simulations to study electrodynamics of a few geometries of nanostructures used for single molecule spectroscopy and imaging.
Research specializing in femtosecond laser coupled STM, STM induced photon emission, single molecule spectroscopy / microscopy.