Associate Professor

Keshav D​ani

kmdani ('at'

[November 2011 - ]

I joined OIST as an Asst. Professor in Nov. 2011 after completing a Director’s Postdoctoral Fellowship at the Center for Integrated Nanotechnologies at Los Alamos National Laboratory. I graduated from UC Berkeley in 2006 with a PhD in Physics under the supervision of Prof. Daniel Chemla. I obtained a BS from Caltech in Mathematics with a senior thesis in Quantum Information Theory under John Preskill and Hideo Mabuchi. My recent research interests have been in studying the nonlinear and ultrafast properties of 2D and energy materials, terahertz spectroscopy and devices, and applications of femtosecond pulses to neuroscience.

Keshav Dani


Research Administrator

Yumi Ito


[April 2015 - ]

I began my career at Texas State University in September 2004 as a part-time editorial assistant and joined the staff full-time for Dani Unit as an administrative assistant in April 2015. My key element for the unit is caring and warmth in assisting them in achieving their objectives from administrative side, and in helping them have a laugh and fun. Favoring trip and movies, I enjoy spending time with family and friends. An oni-wife and a mother of a King-Kong baby boy.


Staff Scientists

Michael Man (‘at’

[December 2017 - ]

I received both my master and PhD degrees from the Hong Kong University of Science and Technology (HKUST). My main research interest is in the growth and characterization of nanostructures/ultrafilm films using a powerful and versatile technique called low energy electron microscopy and photoemission electron microscopy (LEEM/PEEM). LEEM/PEEM is capable of performing time and spatially resolved structural, electronic and chemical state measurements at spatial resolution down to the nanometer range. With this instrument, for example, we can study the correlation between morphology and band structure in inhomogeneous nanostructures such as in few layer graphene; we can also examine the surface magnetic state and image the dynamics in magnetic domain structure in variety of magnetic nanomaterials. I joined Prof. Dani’s group in OIST in December 2012. Together, we seek to combine my experience in LEEM/PEEM microscopy with the group’s expertise in ultrafast spectroscopy techniques. One of our goals is in the investigation and visualization of the ultrafast dynamics in nanostructures.


Michael Man


Postdoctoral Researchers

Julien Madéo


[July 2014 - ]

I did my PhD in Laboratoire Pierre Aigrain at Ecole Normale Supérieure in Paris where I studied quantum cascade lasers using THz time-domain spectroscopy and their optical nonlinearities for wavelength conversion. In 2012, I visited OIST for a few months to provide help in building the first lab of the FSU. Then, I came back to Paris for two years in Matériaux et Phénomènes Quantiques, Paris 7 University to study microcavity THz sources and InAs/AlSb based quantum cascade lasers. Since 2014, I am back in the FSU and my current interests cover: THz optoelectronics and devices, ultrafast and nonlinear optics as well as 2D materials and heterostructures.


Christopher Petoukhoff

christopher.petoukhoff ('at'

[June 2017 - ]

I obtained my Ph.D. from Rutgers University (NJ, USA) in Materials Science and Engineering in the group of Deirdre O'Carroll. The focus of my dissertation was on designing plasmonic metasurfaces for light-trapping in thin-film photovoltaics. I visited the Femtosecond Spectroscopy Unit for 10 weeks during the summer of 2015, and returned as a Special Research Student from Jul 2016 - Apr 2017. I started as a post-doc in Jun 2017, and my current research interests include: ultrafast dynamics of energy materials, van der Waals heterostructures, organic semiconductors, and plasmonic light-trapping.



PhD Students

E Laine Wong

elaine.wong ('at'

[January 2014 - ]

I joined Dani Unit for my PhD study in Jan 2014 after completing my brief rotations in various fields of optical microscopy, gene transformation, terahertz time-domain spectroscopy and cold atoms. I graduated from National University of Singapore with a bachelor degree in Engineering and went on to work as a research assistant in the optoelectronics lab in the university. My PhD study will focus on nonlinear optical properties of condensed matter. I look forward to employ the various experimental tools such as pump-probe and high harmonic generation to acquire better understanding of the femtosecond dynamics in matter.

Viktoras Lisicovas

viktoras.lisicovas ('at'

[March 2014 - ]

I graduated from Jacobs University in Bremen, Germany with a degree in Biochemistry and Cell Biology. Later, I have worked in the Laboratory of Biophysics and Applied Pharmacology at ENS Cachan. At OIST my interest lies in studying the basic mechanisms of memory in small networks. I joined Femtosecond Spectroscopy Unit to pursue improvements in optical imaging techniques for basic neuroscience applications.

Andrew Winchester

andrew.winchester ('at'

[September 2015 - ]

I recieved my BSc and MSc in physics from Southern Illinois University, Carbondale. While there, I spent time researching various nanomaterials, from carbon nanotubes and graphene to molybdenum disulfide, including ways to produce them and their applications in energy storage. Here in Okinawa, I plan to continue studying various nanomaterials in the Femtosecond Spectroscopy Unit. In particular, I want to study their ultrafast and nonlinear optical properties and work to develop next-generation optoelectric devices which rely on these novel properties.


Vivek Pareek

vivek.pareek ('at'

[September 2016 - ]

I received my dual BS-MS degree from IISER-Kolkata, India. During my master's thesis, I studied the high pressure dependence of multiferroics using Raman spectroscopy. My rotation project with FSU has increased my interest in the field of femtosecond spectroscopy. Therefore, I decided to join FSU to pursue my PhD. I will be studying the optical properties of 2D semiconductors for my thesis.


Joel Pérez Urquizo

joel.perezurquizo ('at'

[September 2017 - ]

I got both my bachelor and master degree at “Universidad Nacional Autónoma de México (UNAM)”. I majored in Telecommunications Engineering where I worked at the microwave regime designing and fabricating planar resonant devices for near field microwave microscopy. For my masters I scaled up in frequencies and worked in the THz regime designing and fabricating photoconductive probes for THz near field imaging. Today I’m a PhD student of the 2016 class at OIST and I’m joining the Femtosecond Spectroscopy Unit where I will focus on the research of Quantum Cascade Lasers for THz generation.


Sofiia (Sonya) Kosar

sofiia.kosar ('at'

[September 2018 - ]

I began my PhD studies at OIST in September 2017 after obtaining my master’s degree in solid state physics from the Chernivtsi National University in Ukraine. My thesis was focused on energy materials, in particular, on semiconducting materials for photocatalytic water splitting under solar illumination. I have also spent one year at the University of Groningen in Netherlands studying nanoscience during my masters. I joined FSU as a rotation student in January 2018 after finishing my rotation project on perovskite solar cells. Here I am planning to continue studying energy materials by doing transient absorption spectroscopy experiments on two-dimensional organic heterostructures.



Special Research Students

Chakradhar Sahoo

chakradhar.sahoo ('at'

[May 2018 - ]

I finished my M.Sc (Physics) at University of Hyderabad (UoH) with “Laser Physics” specialization. While there, I performed my research project on Nonlinear Optics, Laser direct writing on semiconductors. After, I joined as a research scholar (PhD) in school of Physics at UoH and was continuing “ultrafast molecular dynamics via pump-probe technique”. Here, I joined FSU as a Special Research Student and am going to work on “ultrafast dynamics of 2d van der Waals heterostructures through micro pump-probe experiment”.


Visiting Researchers

Alina Lyuleeva

alina.lyuleeva ('at'

[November 2018 - ]

I completed my Bachelors and Masters in Chemistry at the Technical University of Munich (TUM) and joined the group of Prof. Paolo Lugli as a doctoral candidate (PhD student) in 2014. After receiving the Ph.D. degree from the Department of Electrical and Computer Engineering, Chair of Nanoelectronics (TUM) in April 2018, I started as a postdoctoral research fellow in the group of Prof. Junichiro Kono at the Rice University (Houston, Texas). My research expertise includes application of novel 2D nanomaterials, such as graphene and silicon nanosheets in sensors and optoelectronics. However, currently I am working on the characterization of aligned SWCNTs via ultra-fast spectroscopy techniques. One part of that project includes a collaboration with the group of Prof. Dani at OIST (Okinawa, Japan), for which I joined the Dani Unit in November 2018 as a visiting researcher.


Research Interns

Mohamed Abdelrasoul

mohamed.abdelrasoul ('at'

[Dec. 2018 - ]

I received my master’s degree in optics and photonics from Karlsruhe Institute of Technology (KIT), Germany, then I joined Zewail City of Science and Technology in Egypt as a research assistant. I worked on setting up the four-dimensional ultrafast electron microscopy (4D-UEM) by building and integrating an ultrafast pump-probe optical setup with a modified transmission electron microscope, where I found it a fascinating as well as a challenging task. At FSU, I am going to pursue my interest in probing ultrafast dynamics with the hope of extending the capabilities of both the ultrafast laser systems and the photoemission electron microscope (PEEM).


Lisa Walter ('at'

[Feb. 2019 - ]

I recieved my Bachelor’s degree in Physics in November 2018 at the University of Regensburg (UR), Germany. My thesis was focusing on fabrication and investigation of 2D materials. I joined the part of Rupert Huber’s group in Regensburg which investigated 2D TMDC materials using time-resolved pump multi-THz probe spectroscopy. Currently, I am doing my Master studies in Regensburg, where I recently worked on scanning tunnelling microscopy. I am joining the Femtosecond Spectroscopy Unit for a research internship where I plan to get an insight into photoemission electron microscopy (PEEM) and hybrid perovskite materials.



Previous Group Members

Previous Rotation Students


Page last updated on February 23, 2018 (CP).