Tuan Nguyen

Tuan Nguyen
The College of New Jersey | TCNJ · Department of Physics

PhD

About

27
Publications
3,179
Reads
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526
Citations
Citations since 2017
4 Research Items
167 Citations
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2017201820192020202120222023051015202530
2017201820192020202120222023051015202530
2017201820192020202120222023051015202530
Introduction
Tuan Nguyen currently works at the Department of Physics, The College of New Jersey. Tuan does research in Biophysics, Atomic, Molecular and Optical Physics and Experimental Physics. Their current project is 'Mapping Neuronal Networks'.
Additional affiliations
August 2017 - present
The College of New Jersey
Position
  • Professor (Associate)
August 2012 - August 2017
The College of New Jersey
Position
  • Professor (Assistant)
September 2007 - July 2012
University of Pittsburgh
Position
  • PostDoc Position

Publications

Publications (27)
Article
The transynaptic and retrograde spread of rabies virus make it an efficient and robust transneuronal tracer, capable of revealing connectivity patterns of multisynaptic, neuronal circuits with great detail. Current techniques begin by infecting many neurons simultaneously, from which higher-order neurons are then labeled sequentially in time. Here...
Article
The acoustic startle response (ASR) is a reflexive contraction of skeletal muscles in response to a loud, abrupt acoustic stimulus. ASR magnitude is reduced if the startle stimulus is preceded by a weaker acoustic or non-acoustic stimulus, a phenomenon known as prepulse inhibition (PPI). PPI has been used to test various aspects of sensory discrimi...
Article
Full-text available
We describe an ultraviolet (uv) diode laser system for cooling trapped Yb(+) ions. Using four stages of thermoelectric cooling, 10 mW of light at 369.5 nm is obtained by cooling a 373.4-nm uv diode to approximately -20 degrees C. Frequency stabilization is provided by a diffraction grating mounted in the Littrow configuration which allows for a mod...
Article
Over 8 months, we monitored transition frequencies between nearly degenerate, opposite-parity levels in two isotopes of atomic dysprosium (Dy). These frequencies are sensitive to variation of the fine-structure constant (alpha) due to relativistic corrections of opposite sign for the opposite-parity levels. In this unique system, in contrast to ato...
Article
A technique combining fluorescence imaging with Ca²⁺ indicators and single-cell laser scanning photostimulation of caged glutamate (LSPS) allows identification of functional connections between individual neurons in mixed cultures of rat neocortical cells as well as observation of synchronous spontaneous activity among neurons. LSPS performed on la...
Preprint
Full-text available
A technique combining fluorescence imaging with Ca ²⁺ indicators and single-cell laser scanning photostimulation of caged glutamate (LSPS) allows identification of functional connections between individual neurons in mixed cultures of rat neocortical cells as well as observation of synchronous spontaneous activity among neurons. LSPS performed on l...
Article
Hearing loss leads to a host of cellular and synaptic changes in auditory brain areas that are thought to give rise to auditory perception deficits such as temporal processing impairments, hyperacusis, and tinnitus. However, little is known about possible changes in synaptic circuit connectivity that may underlie these hearing deficits. Here, we sh...
Article
Full-text available
Using single-cell laser scanning photostimulation (LSPS) combined with broad-field calcium imaging, we measured the functional connectivity of neuronal cultures before and after the developmental appearance of network bursting. From these data, network properties were determined for these relatively large neuronal networks. Based on these propertie...
Chapter
Photostimulation of neurons with caged glutamate is a viable tool for mapping the strength and spatial distribution of synaptic networks in living brain slices. In photostimulation experiments, synaptic connectivity is assessed by eliciting action potentials in putative presynaptic neurons via focal photolysis of caged glutamate, while measuring po...
Article
Full-text available
The inferior colliculus (IC) in the mammalian midbrain is the major subcortical auditory integration center receiving ascending inputs from almost all auditory brainstem nuclei as well as descending inputs from the thalamus and cortex. In addition to these extrinsic inputs, the IC also contains a dense network of local, intracollicular connections,...
Article
This article describes the assembly and performance of a simple and inexpensive ultraviolet-flash system suitable for rapid focal photolysis of caged compounds in cultured neurons and brain slices. Advantages and limitations of this system are discussed. Examples are provided illustrating how this system can be used for stimulating neurons and mapp...
Article
Full-text available
Long-lived metastable states of Yb + ions are used for atomic frequency standards, precision measurements, and quantum information research. The effect of population trapping and transfer in these states must be well understood. We report here the transfer of Yb + ions into the long-lived 2 F 7/2 state by means of collisions between He buffer gas a...
Conference Paper
Radio-frequency electric-dipole transitions between nearly degenerate, opposite parity levels of atomic dysprosium (Dy) were monitored over an eight-month period to search for a variation in the fine-structure constant, α. The data provide a rate of fractional temporal variation of α of (−2.4±2.3)×10 −15 yr −1 or a value of (−7.8 ± 5.9) × 10 −6 for...
Article
Electric-dipole transitions between nearly degenerate, opposite parity levels of atomic dysprosium (Dy) were monitored overan eight-month period to search for a variation in thefine-structure constant, α. The frequencies of thesetransitions are sensitive to variation of α due to largerelativistic corrections of opposite sign for the opposite-parity...
Article
Radio-frequency E1 transitions between nearly degenerate, opposite parity levels of atomic dysprosium were monitored over an eight month period to search for a variation in the fine-structure constant. During this time period, data were taken at different points in the gravitational potential of the Sun. The data are fitted to the variation in the...
Article
We have studied collisional perturbations of radio-frequency (rf) electric-dipole (E1) transitions between the nearly degenerate opposite-parity levels in atomic dysprosium (Dy) in the presence of 10 to 80 $\mu$Torr of H$_\text{2}$, N$_\text{2}$, He, Ar, Ne, Kr, and Xe. Collisional broadening and shift of the resonance, as well as the attenuation o...
Article
It has been proposed that the radio-frequency electric-dipole (E1) transition between two nearly degenerate opposite-parity states in atomic dysprosium should be highly sensitive to possible temporal variation of the fine structure constant ($\alpha$) [V. A. Dzuba, V. V. Flambaum, and J. K. Webb, Phys. Rev. A {\bf 59}, 230 (1999)]. We analyze here...
Conference Paper
Magneto-optical (Faraday) rotation is a process in which the plane of light polarization rotates as light propagates through a medium along the direction of a magnetic field. In atomic vapors where ground state atomic polarization relaxes very slowly (relaxation rates < 1 Hz), there arise ultranarrow, light-power-dependent (nonlinear) features in t...
Conference Paper
Recent and ongoing experiments testing various fundamental discrete symmetries are discussed, including search for parity nonconservation in dysprosium and ytterbium, investigation of possibilities of searches for parity and time-reversal invariance violation in samarium, and a test of permutation properties of photons in a two-photon transition in...
Article
We investigate a three-step population scheme to efficiently transfer atoms to a particular metastable state of atomic dysprosium, and present evidence of adiabatic passage in the first step. This scheme will be employed in an ongoing search for parity nonconservation (PNC) in dysprosium. In order to excite a large fraction of the transverse veloci...
Article
We are preparing a new experiment searching for parity nonconservation (PNC) using the nearly degenerate excited states in atomic dysprosium (Dy)(A. T. Nguyen, D. Budker, D. DeMille, and M. Zolotorev, Search for parity nonconservation in atomic dysprosium. Phys. Rev. A 56(5), 3453-63 (1997).). Like in the earlier experiment^1, a loosely collimated...
Article
Results of a search for parity nonconservation (PNC) in a pair of nearly degenerate opposite-parity states in atomic dysprosium are reported. The sensitivity to PNC mixing is enhanced in this system by the small energy separation between these levels, which can be crossed by applying an external magnetic field. The metastable odd-parity sublevel of...
Article
We are preparing a pulsed-laser atomic beam experiment in which we will measure radiative lifetimes and electric polarizabilities of low-lying energy levels in atomic samarium. For the polarizability measurements, the Stark quantum beat technique will be used. In addition, the experimental apparatus will be used to search for the 4f^66s^2 5D_0,4 st...
Article
Full-text available
Lifetimes of 21 excited states in atomic Yb were measured using time-resolved fluorescence detection following pulsed laser excitation. The lifetime of the 4f{sup 14}5d6s {sup 3}D{sub 1} state, which is of particular importance for a proposed study of parity nonconservation in atoms, was measured to be 380(30) ns.
Article
Lifetimes of 21 excited states in atomic Yb were measured using time-resolved fluorescence detection following pulsed laser excitation. The lifetime of the 4f 145d6s 3D1 state, which is of particular importance for a proposed study of parity nonconservation in atoms, was measured to be 380?30? ns.

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