Oksana Ostroverkhova

Research Group

Organic Photonics and Electronics

Our group meetings are open to all faculty, graduate students, and undergraduate students who are interested in Optical Physics. Visitors are welcome, please inquire. Group meetings are held on Fridays at 4pm in Yunker library, unless indicated otherwise. See the page with Schedules and Group Info for some details about our group meetings for this term.

Resources Check out two mini-tutorials developed by Whitney Shepherd which highlight her recent work on effects of aggregate formation and FRET and exciplex formation on exciton and charge carrier dynamics in organic semiconductors! Also see a tutorial on physics and applications of photorefractive organic materials, developed by Oksana. Web environment for the tutorials was developed by Thomas Gilray and supported by NSF (CAREER) DMR-0748671.

Jan 15 Rebecca will give two presentations (single molecule fluorescence and optical tweezers work) at the upcoming SPIE Photonics West 2015 !

Jan 15 Oksana's paper on bee vision is coming out in Journal of Comparative Physiology A !

Jan 12 Oksana presents an invited talk at the EMN Photovoltaics meeting !

Jan 9 Rajesh's, Keshab's and Brian's paper on ternary solar cells is published in special section of Journal of Photonics for Energy !

Dec 1 Keshab and Brian present talks at the MRS Fall Meeting !

Oct 8 Oksana's postdoc adviser Prof. W. E. Moerner wins the Nobel Prize in Chemistry !!! Congratulations, W.E. !!

Oct 1 Jeremy Rath joins the group as an undergraduate researcher. Welcome !!

July 28 Keshab's and Brian's paper on D/A interactions is published in APL !

June 15 Congratulations to Mattson Thieme who graduated with his B.Sc. !!

May 2 Keshab presented his work at the NW APS meeting in Seattle, WA.

Apr 17 Congratulations to Rebecca who passed her oral exam !!

Apr 7 Congratulations to Jake who was awarded with the URISC grant to work on optical tweezer-based charge measurements!!

Apr 3 Jake accepts the REU offer from the U of Washington !

Feb 5 Rebecca presented her work at the SPIE Photonics West meeting in San Francisco, CA.

Dec 17 Dr.Rajesh K. R. joins the group as a postdoctoral researcher. Welcome !!

Oct 20 Physics junior Jake Busche joins the group as an undergraduate researcher. Welcome !!

Sep 6 Brian and Keshab presented their work at the SPIE Optics and Photonics meeting and will also give presentations at the upcoming MSI conference in Eugene, OR.

Sep 6 Congratulations to Kati who graduated with a M.Sc.and is starting a new job at Radiant Zemax!!

Aug 30 A book under Oksana's edition entitled "Handbook of organic materials for optical and (opto)electronic devices: Properties and Applications" is out !

Aug 30 Oksana's book chapter is coming out in the book entitled "Organic Electronics" (F. Cicoira and C. Santato, Eds.) !

June 24 Congratulations to Mattson who received a URISC award!!

June 10 Congratulations to Kyle and Afina who successfully defended her B.Sc. theses and will be joining Ph.D. programs at Case Western and U of Michigan, respectively!!

June 3 Congratulations to Afina who received an honorable mention in the College of Science Outstanding Undergraduate Researcher Award competition!!

Dec 6 Congratulations to Whitney who successfully defended her Ph.D. thesis and will be joining Intel shortly!!

Nov 15 Mattson Thieme, junior physics major, joins the group. Welcome !!

Oct 1 Dr. Keshab Paudel joins our group as a postdoctoral researcher. Welcome !! Keshab comes to us from Prof. Guha's group at the U of Missouri.

Sep 13 Oksana gave an invited talk on physics of organic optoelectronic materials at the MSI conference at the U of Oregon !

Aug 9 Mark's and Afina's paper on donor-acceptor interactions is coming out in J Phys Chem C!

June 13 Mark's paper on hexacenes has been accepted for publication in the Special Issue of Chemical Communications!

June 11 Congratulations to Mark who received the departmental Research Award!!

May 25 Congratulations to Mark who successfully defended his Ph.D. thesis!!

May 17 Congratulations to Oksana who was awarded with College of Science Scholar of the year award!!

May 9 Mark gave a talk at the solid state/optics seminar and is preparing to defend his Ph. D. thesis on May 25. He will start his appointment at Intel on July 1!!

May 5 We thank the NSF for funding our project that aims to explore intermolecular interactions in high-performance small-molecule bulk heterojunctions!!

Jan 21 First-year graduate student Katy Bilty and sophomore bioengineering major Joshua Burr will be rotating in our group this term. Welcome !!

Jan 16 Oksana gave an invited seminar at the University of Montreal!

Dec 7 Andy's and Mark's paper on temperature dependence of exciton and charge carrier dynamics in organic films has been accepted for publication in the Phys Rev B !

Nov 18 Congratulations to Afina who was awarded with Janet Richens Wiesner University Honors College Scholarship for Undergraduate Women in Science!!

Nov 18 Oksana gave an invited seminar at the Willamette University!

Oct 22 Whitney presented an invited talk at the NW APS meeting in Corvallis!

Sep 15 Oksana presented an invited talk at the NW AVS meeting in Portland!

June 15 Sophomore physics major Kyle Peters joins the group. Welcome!!

Apr 1 First-year graduate students, Brian Johnson and Rebecca Grollman, join the group. Welcome!!

Jan 25 Whitney's, Andy's, and Mark's paper on FRET and exciplex formation and their effect on optoelectronic properties of organic semiconductors has been accepted for publication in the J Phys Chem Lett !

Jan 25 Whitney presented her work at the SPIE Photonics West meeting in San Francisco !

Jan 20 Alex Robertson, a sophomore from Nuclear Engineering, joins the group. Welcome !!

Sept 30 Whitney's and Andy's paper on molecular aggregation and its effect on optoelectronic properties of organic semiconductors has been accepted for publication in the APL !

Sept 12 Whitney's paper on charge and energy transfer in organic semiconductors has been accepted for an oral presentation at the SPIE Photonics West meeting in January 2011 !

June 5 Congratulations to Andy who received the 2009-2010 best RA award !!

May 16 Congratulations to Oksana who was promoted to Associate Professor with indefinite tenure !!

Apr 12 Congratulations to Whitney who was awarded with the SPIE Scholarship !!

Feb 12 We thank the ONAMI for funding our two collaborative projects on intracellular nanosensors and energy transfer in organic semiconductors !!

Feb 1 Undergraduate student in physics Afina Neunzert joins the group. Welcome !!

Jan 11 Undergraduate student in physics David Hofer joins the group. Welcome !!

Dec 21 Congratulations to Garrett and Jessica who received URISC funding for their research projects entitled "Preliminary Study of Charge Transfer in Organic Semiconductor Materials" and "Optical Trapping and Fluorescence Spectroscopy of Nanoparticle Sensors in Microfluidic Devices, respectively!!

Dec 17 Undergraduate student in physics Kyle Williams joins the group. Welcome !!

Dec 10 High-school student Hayley Sargent joins the group. Welcome !!

Dec 3 Congratulations to Whitney who received SPIE travel grant to present her work at the SPIE Photonics West meeting in San Francisco in January 2010 !!

Nov 17 Congratulations to Whitney who passed her oral exam !!

Oct 29, Nov 2 Oksana presented talks on current research at the Materials Science Institute seminar and Physics department colloquium (OSU).

Sep 27 Oksana's and Sujaya's project on bee vision was one of the four projects in the College of Science selected for the "Breakthroughs in Science" event organized by OSU Foundation.

Sep 27 Undergraduate students in physics Keith Schaefer and Tom Hathaway join the group. Welcome !!

Sep 21-24 Whitney and Andy presented a poster at the MicroNano Breakthrough conference in Portland, OR.Oksana gave a progress report at the ONAMI meeting.

Sep 21 Whitney's abstract on single-molecule imaging of organic semiconducting molecules is accepted for oral presentation at the SPIE Photonics West meeting.

Sep 8-17 Oksana gave seminars at U of Texas in Austin, Case Western Reserve University, and U of Michigan in Ann Arbor.

Aug 27 Mark's paper on wavelength dependence of optical trapping forces is accepted for publication in Journal of the Optical Society of America B.

Aug 1-5 Andy and Oksana presented work on organic semiconductors at the SPIE meeting in San Diego.

July 22 Congratulations to Andy who passed his oral exam !!

June 16 Andy's and Jonathan's paper on fluorescent and photoconductive properties of organic semiconductors is accepted for publication in Journal of Physical Chemistry C.

June 10 Thomas Gilray, an undergraduate student in computer sciences at the U of O, is back to work with us over the summer. Welcome back!!

May 26 Congratulations to Whitney who was awarded Oregon Sports Lottery Scholarship !!!!!!

May 20 Jessica Gifford, an undergraduate student in physics, joins the group. Welcome !!

May 15 Jonathan's and Andy's paper on contribution of effects at metal-organic interfaces into photoconductive performance of organic semiconductor-based devices is published in Journal of Applied Physics.

Apr 28 Mark gave a talk on his optical tweezer trapping work at the OSA topical meeting on optical trapping and applications in Vancouver, Canada.

Apr 14 We thank Agricultural Research Foundation for funding our project on increasing efficiency of bee pollinators using optical methods (with Prof. S. Rao).

Apr 13 We thank ONAMI for selecting our projects on quantum dot nanosensors (with Profs. A. Shvarev and D. McIntyre) and on acquisition of Raman microscope (with Profs. G. Rorrer, E. Minot, J. Tate, P. Dhagat, A. Jander) for funding.

Mar 10 Oksana is invited to give a talk at the SPIE annual meeting in San Diego (August 2-6, 2009). Andy will also attend and present his work on organic semiconductor composites.

Mar 2 Mark's papers on optical tweezers with resonant particles have been accepted for presentations at Optical Trapping Applications topical meeting (Vancouver, Canada, April 26-30, 2009) and at CLEO/QELS (Baltimore, May 31-June 3, 2009).

Feb 5 Oksana gave a colloquium on photoconductive and photoluminescent properties of organic semiconductors at the University of Oregon.

Dec 20 Garrett Banton, an undergraduate student in Nuclear Engineering, joins the group. Welcome!

Dec 10 Jonathan's and Andy's paper entitled “Organic semiconductor composites: influence of additives on the transient photocurrent” has been accepted for publication in Applied Physics Letters.

Jun 27 Jonathan's JAP paper entitled “Photoconductivity in organic thin films: From picoseconds to seconds after excitation” is published: J. Appl. Phys. 103, 123715 (2008).

Jun 20 Congratulations to Jonathan who successfully defended his thesis entitled “On the photoresponse of several novel functionalized oligoacene and anthradithiophene derivatives” !!

May 19 Andy's and Whitney's paper entitled “Novel functionalized pentacene and anthradithiophene derivatives: photoconductive and fluorescent properties” has been accepted for presentation at the Organic Thin Film Symposium and selected for Sci-Mix poster session at the ACS National Meeting in Philadelphia, August 20-24, 2008.

May 15 We thank ONAMI for selecting our proposal entitled “Biochemical Sensors and Integrated Measurement Platform Controlled by Optical Tweezers and Microfluidics” (in collaboration with Profs. D. McIntyre, V. Remcho, A. Shvarev, S. Reed, S. Prasad) for funding.

May 5 Jonathan's paper entitled “Photoconductivity in organic thin films: from picoseconds to seconds after excitation” has been accepted for publication in Journal of Applied Physics.

May 1 Oksana will give an invited talk entitled “Organic (opto)electronic materials: understanding charge carrier dynamics” at NW APS meeting in Portland, OR, May 16–17, 2008.

Apr 25 Oksana will give an invited talk entitled “Photoexcited charge carrier and exciton dynamics in organic thin films” at ICONO10 in Santa Fe, NM, May 19–24, 2008.

Apr 17 Congratulations to Whitney who passed the comp exam !!

Apr 15 Guy Cutting, an undergraduate student in computational physics, joins the group. Guy will develop software for fluorescence lifetime imaging. Welcome !!!!!!!!

Mar 25 We thank the OSU Research Office for funding our GRF proposal (in collaboration with Prof. S. Rao) entitled “The unanticipated effects of sunlight-induced fluorescence on native bee pollinator behavior.”

Mar 20 Oksana is scheduled to give an invited talk “Photoexcited charge carrier and exciton dynamics in organic thin films” at ICONO at Santa Fe, NM, on May 22.

Mar 18 Oksana visited Washington State Univeristy and presented a colloquium entitled “Organic optoelectronic materials: understanding charge carrier dynamics.”

Mar 16 Whitney Buchanan joins the group. Welcome !!!!!!!!

Feb 25 Andy's paper entitled “Temperature Dependent Properties of Novel Functionalized Anthradithiophene and Dicyanomethylenedihydrofuran Derivatives” and Mark's paper entitled “Optical tweezers with resonant particles” are accepted for presentation at CLEO/QELS (San Jose, CA, May 2008) (papers CFG2 and JWA122, respectively).

Feb 20 Oksana's collaborative paper entitled “Fabrication and optical properties of nanoscale arrays of Au and Pd in polymers” (S.V. Atre, S. Bhowmik, O.P Valmikanathan, and O. Ostroverkhova) is accepted for presentation at the NSTI meeting (Boston, MA, June 2008)

Feb 6 We thank the NSFDMR for awarding us with a CAREER grant for a project entitled “Charge Carrier Dynamics in Organic Semiconductors: from Macroscopic to Microscopic Level.”

Nov 6 Congratulations to Mark K. who passed his Ph.D. oral exam !!

Aug 15 We thank the NSF/DMR for funding our MRI proposal on acquisition of a high-performance NSOM (in collaboration with Profs. M. Deutch, G. Richmond, and W. Roberts).

Jul 15 We thank ONAMI/ONR for funding our project “Beyond Sensing under Equilibrium: Photoresponsive Nanoprobes for Rapid Localized Acid-Base Titration” (in collaboration with Profs. A. Shvarev and D. McIntyre).

Jul 15 We thank ONAMI/ONR for funding our project “Identification, imaging and manipulation of charged states in organic semiconductors: from macroscopic to microscopic optoelectronic devices” (in collaboration with Profs. G. Schneider, E. Minot and D. McIntyre).

May 22 Congratulations to Mark K. for receiving the Oregon Sports Lottery Scholarship Award !!!!

May 14 Jonathan's paper entitled “Fast photoresponse of functionalized pentacene and anthradithiophene thin films” submitted to MRS Proceedings has been accepted.

May 9 We thank the Research Office at OSU for funding our proposal targeting acquisition of the high-sensitivity EMCCD camera.

May 6–11 Andy and Mark attended CLEO/QELS in Baltimore, MD, and presented posters entitled “Fluorescent and photoconductive properties of functionalized pentacene and anthradithiophene derivatives” and “Optical field enhancement in tweezer trapping”, respectively.

May 1 Oksana presented a progress report at the ONAMI meeting in Portland, OR.

Apr 16 We thank ONAMI/ONR for funding our projects entitled “Charge carrier dynamics in organic semiconductors at nanoscales: towards optoelectronic nanoswitches” (in collaboration with Profs. J. Anthony and R. Twieg), and “Optical field enhancement in tweezer trapping and single-molecule spectroscopy” (in collaboration with Prof. D. McIntyre).

Apr 9 Jonathan presented a poster entitled “Fast photoresponse of functionalized pentacene and anthradithiophene thin films” at the MRS Spring meeting in San Francisco, CA.

Apr 9–13 Jonathan and Andy attended the MRS Spring meeting in San Francisco, CA.

Mar 1 Congratulations to Sam for a NREIP Summer Internship Award from the Office of Naval Research !!

Mar 1 Mark K.'s paper “Optical Field Enhancement In Tweezer Trapping” is accepted for presentation at CLEO/QELS in Baltimore, Md, May 6-11, 2007.

Feb 27 Congratulations to Jonathan for passing his oral exam !!

Jan 18 Jonathan's abstract “Fast photoresponse in functionalized pentacene derivatives” has been accepted for presentation at the MRS meeting in April 2007 in San Francisco, CA.

Jan 17–19 Andy and Mark K. attended a Workshop on Advanced Microscopy and Imaging at UC Berkeley.

Dec 22 Oksana's paper “Anisotropy of transient photoconductivity in functionalized pentacene single crystals,” published in Applied Physics Letters 89, 192113 (2006), has been selected for publication in the Virtual Journal of Ultrafast Science (Dec 2006 issue), and in The Virtual Journal of Terahertz Science and Technology (Nov 2006).

Dec 1 We thank the AFOSR for supporting our collaboration with Prof. Peyghambarian group at the College of Optical Sciences (Tucson, AZ) on 3D holographic updateable displays.

Nov 10 Oksana's recent Applied Physics Letters paper “Anisotropy of transient photoconductivity in functionalized pentacene single crystals” has been published online: Appl. Phys. Lett. 89, 192113 (2006).

Oct 16 Oksana gave a seminar on ultrafast carrier dynamics in organic semiconductors at the Oregon Center for Optics.

Oct 12 Congratulations to Andy Platt and Mark Kendrick for passing the comprehensive exam !!

Sep 28 Oksana's most recent paper “Anisotropy of transient photoconductivity in functionalized pentacene single crystals” has been accepted for publication in Applied Physics Letters.

Sep 15 Jonathan presented a poster entitled “Functionalized pentacene: direct measurement of fast photoresponse” at the Oregon Center for Optics annual meeting.

Sep 14–15 Andy, Jonathan, and Mark K. attended the annual meeting at the Oregon Center for Optics.

Sep 10–14 Oksana presented an invited talk entitled “Ultrafast carrier dynamics in organic semiconductors” at Organic Thin Films for Photonic Applications Symposium in San Francisco, CA.

Jul 1 Welcome to our new undergraduate member Sam Peterson.

Jun 16 Congratulations to our undergraduate members Joe Peterson and Zack Peterson for successfully defending their senior theses, and for graduating with B.Sc. degree in physics!

May 16 Oksana's most recent paper “Ultrafast carrier dynamics in pentacene, functionalized pentacene, tetracene, and rubrene single crystals,” Applied Physics Letters, 88, 162101 (2006), has been selected for publication in the May 2006 issue of the Virtual Journal of Ultrafast Science, and in The Virtual Journal of Terahertz Science and Technology (April 2006).

Apr 20 Congratulations to our undergraduate group member Mark Mazurier who received URISC Summer 2006 Award (funding) for his research project “Photophysical Properties of Organic Semiconductors” !!!

Apr 19 We thank Spiricon, Inc. for donating us a laser beam analyzer, which will be used in FROG ultra-short pulse analyzing and in monitoring the laser beam quality.

Apr 16 Oksana's paper “Ultrafast carrier dynamics in pentacene, functionalized pentacene, tetracene and rubrene single crystals” has been published in Applied Physics Letters.

Apr 6–7 Oksana gave a seminar at the College of Optical Sciences in Tucson, Arizona.

Apr 3 Oksana is invited to give a talk at the Organic Thin Films Symposium, San Francisco, Sept. 10-14, 2006.

Mar 13 We thank Tektronix, Inc. for making us a charitable contribution of the 50GHz digital sampling system (CSA8200 mainframe with 80E01 sampling head) for the research of ultrafast carrier dynamics in organic semiconductors.

Jan 18 Oksana's paper entitled “Ultrafast carrier dynamics in organic semiconductors” has been accepted for presentation at the MRS meeting in San Francisco, CA, April 17-21, 2006.

Dec 29 The book “Photophysics of Molecular Materials: from Single Molecules to Single Crystals”, containing Oksana's contribution (chapter 7, "Probing organic semiconductors with terahertz pulses", with F.A. Hegmann and D. G. Cooke), is now available from John Wiley & Sons.

Dec 23 We thank the Petroleum Research Fund for funding our research project entitled “Charge transfer in organic semiconductors: from microscopic to macroscopic electronic properties on all time scales” !!

Dec 2 We will hold a mini-reception (Friday 4–5:30 pm, in Weniger 101), as the lab renovation is being completed. Please join us, everyone is invited and welcome !

Oct 17–19 Oksana gave an invited talk at Organic Thin Films Conference, OSA Annual Meeting in Tucson, AZ. Title: “Ultrafast photoconductivity in organic semiconductors.” She also chaired the session “Electro-optic modulators and devices.”

Sep 19 Oksana's most recent paper “Optical and transient photoconductive properties of pentacene and functionalized pentacene thin films: Dependence on film morphology,” Journal of Applied Physics 98, 033701 (2005), has been selected for the September 2005 issue of Virtual Journal of Ultrafast Science.

Sep 15–16 Oksana was one of the OSU representatives at the ONAMI Leadership Retreat. Regional strategy and funding plans and opportunities were discussed. She will brief the group at the next meeting (Sep 22nd).

Sep 7–9 Jonathan and Andrew attended the Workshop on Optical Physics, at the Oregon Center for Optics. They presented a report at the following group meeting (Sep 13th).

July 19–23 Oksana gave an invited talk at 10th International Conference on Photorefractive Effects, Materials and Devices in Sanya, Hainan, P.R. China. Title: “Recent advances in photorefractive organic materials.”