Assistant Professor

Keshav Dani
kmdani ('at'

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 ultrafast metamaterial devices, femtosecond dynamics in graphene and in developing pump-probe techniques from visible to THz.

Keshav Dani


Research Administrator

Yumi Ito

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.


Postdoctoral Researchers

Michael Man (‘at’

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

Bala Murali Krishna Mariserla
bala.mariserla ('at'

I am from southern part of India. I joined the Femtosecond spectroscopy unit on 13th may 2013. I have nonlinear optics background and my interests include time domain spectroscopy of optical pump-probe and THz. Before joining the group, I worked at Laser lab, University of Hyderabad for my Ph. D program. I received my masters in physics from Andhra University, Visakhapatnam.
At University of Hyderabad, my thesis involved nonlinear optical characterization of Graphene based hybrid materials, biosynthesized silver nanoparticles and organic molecules using nano, pico and femtosecond laser systems for optical limiting application. Good at degenerate four wave mixing, auto-correlation, Z-Scan and pump-probe techniques.


Julien Madeo

I did my PhD in Laboratoire Pierre Aigrain at Ecole Normale Supérieure in Paris. My work involved, on one hand, the investigation of electronic and optical properties of terahertz sources, Quantum Cascade Lasers (QCL), using THz Time-Domain Spectroscopy (THz TDS). On the other hand, I studied nonlinear optical properties of QCL to perform efficient 3-wave mixing in order to convert a THz radiation onto an NIR optical carrier. In 2012, I did a short postdoctoral visit in Dani Unit to build a broadband THz TDS setup (> 10 THz). Then, I worked 2 years as a postdoctoral researcher in Laboratoire Matériaux et Phénomènes Quantiques at Université Paris 7, where I investigated the properties of novel semiconductor based heterostructures for THz generation and plasmonics. I am very excited to be back at OIST for a longer period. My projects at OIST (in collaboration with MPQ-Paris 7, the University of Leeds and the University of Montpellier) deal with the realization of new THz quantum devices, the control of the losses and near field interaction and investigation of the laser gain using THz-TDS in arrays of microresonators.


Taka Harada

I have taken BSc (Honours) and PhD in Chemistry at the University of Adelaide in Australia, which involved unltrafast spectroscopy (femtosecond transient absorption spectroscopy and time-resolved fluorescence upconversion spectroscopy). In 2013, I joined the Femtosecond Spectroscopy Unit at OIST as a special research student. My keen interest in optical-pump terahertz-probe spectroscopic characterization led to re-join in this unit in April 2015. I am glad to take cutting-edge research and challenging projects in this unit and OIST. It is my hope to further work on optical-pump terahertz-probe spectroscopy, conduct characterizations of novel materials, and extend my scientific skills in ultrafast spectroscopy.



PhD Students

E Laine Wong
elaine.wong ('at'

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.

Athanasios Margiolakis
athanasios ('at'

I completed my BSc (Physics), MSc (Photonics and Microelectronics) at the University of Crete and I worked as a technical student at CERN (LHC - Beam Position Monitoring system). I am currently enrolled in the postgraduate program at the University of Crete under Prof. G. Tsironis and I have been working as a special research student at OIST in Femtosecond Spectroscopy Unit since October 2013. My work is placed both in the Microscopy and High energy Labs and it covers femtosecond spectroscopy techniques and fabrication processes. I am honored to be here and I am motivated by my colleagues and the work environment.

Viktoras Lisicovas

viktoras.lisicovas ('at'


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'


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.



Current OIST Rotation Students

Jason Robert Ball

jason.ball ('at'

[September 2015 - ]

I am a first-year graduate student at OIST and I am joining the Femtosecond Spectroscopy Unit for my first term rotation. I am from Michigan (US) originally and graduated with a BSc. and Honors in Physics from the University of Michigan. Later I graduated from Rice University in Houston, TX with an MSc. in Physics, before taking two years off to teach high school Physics. At Rice I worked on several projects involving measurements of cyclotron and plasmon resonance in 2-dimensional electron and hole gases, fabrication and testing of single-wall carbon nanotube devices, and observation of Raman scattering in nanotube solutions. I am hoping to learn a lot about terahertz spectroscopy from this Unit.




Visiting Researchers

Christoph Neumann

cneumann ('at'

[November 2015 - ]

I am a visiting graduate student from RWTH Aachen University in Germany, where I obtained both my B.Sc. and M.Sc. degrees. The research of my graduate studies is focused on optical (Raman) and electric transport experiments on van-der-Waals heterostructures based on high quality graphene. I joined the Femtosecond Spectroscopy Unit at OIST in November 2015. Here, I am involved in the fabrication of van-der-Waals heterostructures, taking advantage of the great facilities. The structures are fabricated for later use in optical and electron spectroscopy experiments, where the intrinsic properties of these materials can be accessed and studied.




Previous Group Members

Previous Rotation Students 


Page last updated on November 6 2015 (TH).