RESEARCH GROUP

1

• RESEARCH GROUP
• JEANETTE JONES, PI
• NICKOLAI KUKHTAREV, CO-PI
• FLORENCE OKAFOR, CO-PI
• TATIANA KUKHTAREVA CO-PI

2
Research Objectives
We suggest using a novel complex optical and
electrical technique of moving light-induced
electric-field gratings for the sensing and
separation and removal of hazardous materials
existing in liquid and vapor phase. This
technique may be also used for processing of
solid-state surfaces using spatially-modulated
electric field and electrical discharges. Our
research objectives based on phenomena that
microorganisms as biophysical objects, may be
identified and separated using electric charges
that are naturally present or may be induced by
photoexcitation.
3
Research Objectives

• This technique can be divided in 3 methods
• 1)structured laser-induced patterns,
• 2) structured electric-field patterns,
• 3) electrical discharges.
• New technique of the holographic or running
  grating may be used not only for identification
  but also for separation of different species with
  different charged states. We simultaneously will
  test another approach based on the details of the
  motility patterns of microbiological objects (MO)
  as signatures of the species. For recording and
  processing of the MO velocities spectra we will
  use a modified method of transient holographic
  photocurrent developed originally for
  characterization of semiconductors

4
Research Objectives
The two methods electrical and optical, will be
tested to determine their suitability for a
contactless methods of MO manipulation. The
primary objectives to be addressed in this phase
are 1.What type of model MO (algae, fungi
virus/bacteriophage, and bacteria) is best for
detection by our biophysical methods? 2.How much
sensitivity can be improved by optimization of
laser intensity, wavelength and polarization?
3.What are the essential design issues for
implementing a contactless method based on
electrical and optical responses?
5
APPROACH
6
APPROACH
7
APPROACH
8
APPROACH

9
TWEEZING by Light-Induced Pattern
10
DECONTAMINATION BY MOVING INTERFERENCE PATTERN
11
DECONTAMINATION BY MOVING INTERFERENCE PATTERN
12
Decontamination by High-Voltage Pulses(Discharges)
13
Decontamination by High-Voltage Pulses(Discharges)
LiNbO3 crystal as a power source for E-O
Modulator.
14
Decontamination by High-Voltage Pulses(Discharges)
15
TASKS

• Development of a method of running optical
  interference pattern using rotating diffractive
  element or mirror displacement
• Testing this method of running grating for
  manipulation of microbiological and chemical
  suspensions by optical tweezing
• Testing the method of moving electric field
  grating for decontamination of water solution and
  aerosols.
• Proof method of Pulsed High-Voltage Discharges
• Report our results in International Conferences
  and publish papers in scientific journals