RESEARCH ON NUCLEAR PHYSICS REPORTED BY S. KHUDAVERDYAN ET AL

Science Letter
January 26, 2010

According to recent research from Yerevan, Armenia, "We report a new
optical sensor exploiting the innovative operation principle developed
for the selective registration of UV and visible radiations. The
operation is based on the mutual influence of depletion regions in the
photovoltaic structure composed by Schottky barrier and n-p junction."

"The important feature of this structure is that the depletion regions
expand over the whole base so that they contact each other. We have
shown that the position of the contact point in the base is a function
of voltage applied to the structure. Also absorption spectrum for each
of the depletion regions and the photoresponse of the structure are
functions of the applied voltage," wrote S. Khudaverdyan and colleagues
(see also Nuclear Physics).

The researchers concluded: "We have revealed that the change induced by
the applied voltage in the photoresponse, Delta I, is proportional to
the change Delta lambda induced in the spectrum, Delta lambda-Delta
I. This linear correlation between Delta I and Delta lambda is a
very important spectrophotometric property required for the precise
selective registration of bio signals in dynamic and static biological
processes."

Khudaverdyan and colleagues published their study in Nuclear
Instruments & Methods in Physics Research Section a – Accelerators
Spectrometers Detectors and Associated Equipment (On the mechanism
of spectral selective sensitivity of photonic biosensors. Nuclear
Instruments & Methods in Physics Research Section a – Accelerators
Spectrometers Detectors and Associated Equipment, 2009;610(1):314-316).

For additional information, contact S. Khudaverdyan, State Engineering
University Armenia, 105 Teryan Str, Yerevan 0009, Armenia.

Publisher contact information for the journal Nuclear Instruments &
Methods in Physics Research Section a – Accelerators Spectrometers
Detectors and Associated Equipment is: Elsevier Science BV, PO Box 211,
1000 AE Amsterdam, Netherlands.