Jeffrey C. Owrutsky

United States Naval Research Laboratory

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Adam D. Dunkelberger

United States Naval Research Laboratory

Daniel A. Steinhurst

Nova Research Company (United States)

Blake S. Simpkins

United States Naval Research Laboratory

Robert A. Walker

Montana State University

Michael B. Pomfret

AstraZeneca (United Kingdom)

A. P. Baronavski

Oceaneering International (United States)

Kenan P. Fears

United States Naval Research Laboratory

William A. Maza

United States Naval Research Laboratory

Daniel Ratchford

United States Naval Research Laboratory

Joshua D. Caldwell

Vanderbilt University

Cooperative Institutions

United States Naval Research Laboratory

136

United States Navy

Naval Research Laboratory Chemistry Division

K Lab (United States)

National Academies of Sciences, Engineering, and Medicine

University of Maryland, College Park

University of Pennsylvania

Lawrence Berkeley National Laboratory

University of California, Berkeley

National Postdoctoral Association

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Thermal imaging of solid oxide fuel cell anode processes

Journal of Power Sources (2009)

Michael B. Pomfret Daniel A. Steinhurst David A. Kidwell Jeffrey C. Owrutsky

Carbon fibers

Non-blocking I/O

Deposition

10.1016/j.jpowsour.2009.06.072

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Citations (49)

CCDC 2279639: Experimental Crystal Structure Determination

The Cambridge Structural Database (2023)

William A. Maza J. August Ridenour Brian L. Chaloux Albert Epshteyn Jeffrey C. Owrutsky

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc2gj4rx

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Operando optical studies of solid oxide fuel cells operating on CO and simulated syngas fuels

Journal of Power Sources (2021)

William A. Maza Daniel A. Steinhurst Melissa D. McIntyre Robert A. Walker Jeffrey C. Owrutsky

Carbon fibers

10.1016/j.jpowsour.2021.229598

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Laser-Induced Transmission on Ultrafast Timescales via Vibrational Strong Coupling

Bulletin of the American Physical Society (2018)

Adam D. Dunkelberger Roderick B. Davidson Wonmi Ahn Blake S. Simpkins Jeffrey C. Owrutsky

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Control of vibration-cavity polaritons in the frequency domain (Conference Presentation)

Blake S. Simpkins Kenan P. Fears Adam D. Dunkelberger Wonmi Ahn Walter J. Dressick

We will focus on approaches which make use of light-matter interactions to alter the chemical behavior of a target molecular species. This is done through cavity coupling to a molecular vibration. Coupling vibrational transitions to resonant optical modes creates vibrational polaritons shifted from the uncoupled molecular resonances and provides a convenient way to modify the energetics of molecular vibrations. This approach is a viable method to explore controlling chemical reactivity and energy relaxation. Here, we demonstrate frequency domain results for vibrational bands strongly coupled to optical cavities. We experimentally and numerically describe strong coupling between a Fabry-Pérot cavity and several molecular species (e.g., poly-methylmethacrylate, thiocyanate, hexamethyl diisocyanate). We investigate strong and weak coupling regimes through examination of cavities loaded with varying concentrations of a urethane monomer. Rabi splittings are in excellent agreement with an analytical description using no fitting parameters. We show that coupling strength is a function of molecule/cavity mode overlap by systematically altering the position of a molecular slab throughout a first order cavity with results agreeing well with analytical and transfer matrix predictions. Further, remote molecule-molecule interaction will be explored by placing discrete and separated molecular layers throughout a cavity. In addition to establishing that coupling to an optical cavity modifies the energy levels accessible to the coupled molecules, this work points out the possibility of systematic and predictive modification of the excited-state kinetics of vibration-cavity polariton systems. Opening the field of polaritonic coupling to vibrational species promises to be a rich arena amenable to a wide variety of infrared-active bonds that can be studied in steady state and dynamically.

Optical cavity

10.1117/12.2274049

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OPTICALLY PUMPED RESTSTRAHLEN BAND TUNING OF WIDE BANDGAP SEMICONDUCTORS

Proceedings of the 2022 International Symposium on Molecular Spectroscopy (2021)

Elizabeth S. Ryland Adam D. Dunkelberger Jeffrey C. Owrutsky Daniel Ratchford Vanessa M. Breslin

Photoinjection studies of two wide bandgap semiconductors, 4H-SiC and GaN, are conducted with fs infrared reflectivity measurements in order to characterize how the relative penetration depths of UV-pump/IR-probe light affects the modulation of the IR reflectivity spectrum.The infrared spectrum of these materials is dominated by the high reflectivity reststrahlen band region that occurs between the longitudinal optical and transverse optical phonons.The injection of free carriers shifts this metal-like region to higher frequencies via coupling of the longitudinal optical phonon to the free carrier plasma (LOPC effect).The result of this LOPC active tuning is strongly perturbed by the charge carrier spatial distribution, and is thus highly sensitive to the means of carrier generation.We probe the effects of charge carrier spatial distribution on the photomodulated reflectivity of two promising wide bandgap semiconductors, indirect bandgap 4H-SiC and direct bandgap GaN, by comparing the transient reflectivity following photoexcitation with light of short and long penetration depths relative to the IR probe depth.This work shows sensitivity of bulk electronic properties to the charge carrier distribution that is critical to understanding the contributions of these materials to complex nanophotonic devices.

Wide-bandgap semiconductor

10.15278/isms.2021.rj08

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Strain-Induced Modification of Photoluminescence in Quasi-2D Perovskite Thin Films

The Journal of Physical Chemistry C (2023)

Daniel Ratchford Vanessa M. Breslin Tara J. Michael Gloria Bazargan Paul A. Brown

Quasi-2D perovskites are recognized as a promising material for lightweight photovoltaic applications. For these applications, it is critical to understand how mechanical stresses affect the perovskite's optoelectronic properties. Here, we discuss how applied stress impacts the photoluminescence spectrum and lifetime of quasi-2D perovskite thin films and how these effects depend on interlayer cation choice (butylammonium or phenethylammonium) and film processing (hot-casting versus postdeposition annealing). We find that compressive stress induces an enhancement and spectral redshift (>10 meV per percent strain) in the emission from bulk-like grains in the film. Moreover, the charge carrier recombination lifetime is greatly enhanced (up to a factor of 14 with only 1% strain). We show that the phenethylammonium-based perovskites are more robust against strain-induced modifications compared to those containing the butylammonium cation. These results highlight how strongly strain can modify the optoelectronic properties of quasi-2D perovskite thin films and how cation choice and film processing can have important practical implications for developing lightweight photovoltaics.

Strain (injury)

10.1021/acs.jpcc.2c08404

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Citations (2)

Vibrational Relaxation Dynamics in Liquids

Annual Review of Physical Chemistry (1994)

Jeffrey C. Owrutsky

Dynamics

Vibrational energy relaxation

10.1146/annurev.physchem.45.1.519

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Citations (29)

Coherent Acoustic Oscillations of Nanorods Composed of Various Metals

The Journal of Physical Chemistry C (2009)

Jeffrey C. Owrutsky Michael B. Pomfret Douglas J. Brown

Ultrafast transient absorption spectroscopy has been used to characterize coherent acoustic oscillations for a series of nanorods composed of a variety of metals. The nanorods are produced by electrochemical synthesis in polycarbonate templates with several pore diameters of <100 nm and high aspect ratios (>25). The measurements extend our previous studies on Au, Ni, and Pd (Sando, G. M.; et al. J. Chem. Phys. 2007, 127, 074705) as well as Al nanorods (Pomfret, M. B.; et al. Chem. Mater. 2008, 20, 5945) to include those composed of Ag, Cu, Pt, Fe, Rh, and Co. The acoustic breathing mode periods measured are consistent with those predicted based on classical elastic theory using the bulk speeds of sound. The phase and damping of the oscillations are discussed in terms of the nanorod structures and excitation mechanisms.

Nanorod

10.1021/jp902398p

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Citations (17)

Optical constants and transient absorption of solution-deposited RuO2 thin films

Bulletin of the American Physical Society (2015)

Jeffrey C. Owrutsky Ryan Compton James P. Long Christopher Chrevin K. Bussmann

Transient (computer programming)

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