Ultrafast nonlinear spectroscopy
Ultrafast nonlinear spectroscopy
Ultrafast nonlinear spectroscopy and microscopy
Spectroscopy with submolecular resolution using inelastic STM
Theory of Molecular Plasmonics and Computational Spectroscopy
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.
Understanding orientation dependent chirality of single metallic nano-dimers invoking magnetic dipole and electric quadrupole to SERS effect.
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.
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
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.
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.
Single molecule microscopy and spectroscopy.
My research is focused on develping tip-enhanced Raman spectroscopy under ultrahigh vacuum conditions.
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.
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 is focused on understanding the interactions between plasmonic nanoparticles and adsorbed molecules, and their effects on the optical properties on both of them. I'm also interested in developing new computational models for accurate and fast simulations of large plasmonic systems.
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.
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.
Chirality is a property of asymmetry with significance in many branches of science and refers to the handedness of a material. Plasmonic materials have also been observed to exhibit handedness in response to light, which represents the basis of chiral plasmonics. I focus on the fabrication and characterization of nanomaterials (as related to chiral plasmonics) prepared using a copper mask nanosphere template lithography method developed in our lab. It is anticipated the versatility offered in this fabrication approach, in conjunction with adequate characterization of associated chiroptical activity, these efforts will lead to scenarios involving chiral plasmon-driven chemistry.
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.