Adjunct Professor of Physics
Dr. Everitt is one of the Army's chief scientists. He works at the Army's Aviation and Missile RD&E Center at Redstone Arsenal, AL. Through his adjunct appointment in the Duke Physics Department, he leads an active experimental research group in condensed matter physics, nanophotonics, molecular physics, and novel terahertz imaging with colleagues on campus and through an international network of collaborators. Four principal research areas are being pursued:
1) Ultrafast Spectroscopy. This effort concentrates on the ultrafast spectroscopic characterization of wide bandgap semiconductor heterostructures and nanostructures. We use independently tunable pump and probe wavelengths that span the ultraviolet-visible-infrared regions from 200 nm to 12 microns with pulses shorter than 150 fs. The objective is to mapout and control carrier, exciton, and phonon transport and relaxation pathways in metal oxide and III-N semiconductors, sometimes doped with rare-earth atoms, using quantum efficiency, cw and time-resolved photoluminescence and differential transmission measurements. Areas of recent interest include characterization of efficient phosphorescence in sulfur-doped ZnO, carrier dynamics in III-N epilayers and multiple quantum wells, and characterization of radiative and nonradiative recombination of rare earth dopants in wide bandgap semiconductor hosts.
2) Ultraviolet Nanoplasmonics. Using metal nanoparticles to concentrate electromagnetic fields locally is an area of active research, most of which concentrates on using Au or Ag in the visible or near infrared spectral regions. Neither metal works in the ultraviolet, but there are significant advantages of extending plasmonics into the ultraviolet, including enhanced Raman cross sections, accelerated photo-degradation of toxins, and accelerated excitonic recombination. In partnership with Profs. April Brown (Duke ECE), Naomi Halas (Rice Univ.), Fernando Moreno (Univ. Cantabria), and others, we have been identifying and exploring new nanostructured metals including gallium and aluminum for ultraviolet plasmonics. We have recently demonstrated accelerated emission rates and surface enhanced Raman spectra in the ultraviolet.
3) Molecular Physics. The longest research effort involves the use of molecular rotational spectroscopy and time-resolved techniques to investigate molecular collision dynamics. These studies will help us develop more efficient terahertz sources, detect and identify clouds of trace gases, and understand nonequilibrium atmospheres and interstellar media. In collaboration with Prof. Frank De Lucia of Ohio State Univ., Dr. Everitt was the first to map out the complete rotational and vibrational energy transfer map of methyl fluoride, leading to the demonstration of a compact, tunable, coherent source of terahertz radiation for use in ground-based spectroscopy and astronomical observation. This double resonance technique has now been adapted as a new means for remotely identifying the constituents of a trace gas cloud at distances up to 1 km.
4) Terahertz Imaging. This newest activity uses powerful, cw, tunable millimeter- and submillimeter-wave sources to adapt various coherent imaging techniques to the terahertz spectral region. Interferometry, digital holography, tomography, synthetic aperture RADAR, ISAR, ellipsometry, and polarimetry are all explored to develop practical tools for non-destructive measurements of visually opaque materials. The lab contains a unique combination of tunable sources, Schottky diode detectors, heterodyne receivers, and bolometers, plus a one-of-a-kind THz beam characterization and imaging instrument. The lab also explores ways of optimizing and accelerating these slow imaging methodologies using digital reconstruction and compressive sampling techniques pioneered by on-campus collaborator Prof. David Brady and novel beam forming metamaterials with Prof. David Smith.
Ultrafast Optical Characterization of Wide Bandgap Semiconductor Heterostructures and Nanostructures awarded by Army Research Office (Principal Investigator). 2004 to 2005
Ultrafast Optical Characterization of Wide Bandage Semiconductors and Polyatomic Molecules awarded by Army Research Office (Co-Principal Investigator). 2001 to 2004
DURIP Equipment Request: A Streak Camera for Time-Resolved Photoluminescence Characterization of Wide Bandgap Semiconductor Heterostructures and Nanostructures awarded by Air Force Office of Scientific Research (Co-Principal Investigator). 2003 to 2004
Duke Terahertz Femtosecond Diagnostic Laboratory awarded by Lord Foundation of North Carolina (Co-Principal Investigator). 1999 to 2002
A Millimeter Wave Photonic Crystal Laser-Staff Research Proposal awarded by Army Research Office (Co-Principal Investigator). 1997 to 1998
Optically Pumped Far-Infrared Lasers Based on Photonic Band Gap Crystals awarded by Army Research Office (Co-Principal Investigator). 1993 to 1997
Millimeter and Submillimeter Science and Technology awarded by National Aeronautics and Space Administration (Co-Principal Investigator). 1987 to 1989
Binder, R., et al. “Nonlinear saddle point spectroscopy and electron-phonon interaction in graphene.” Optical Properties of Graphene, 2017, pp. 349–86. Scopus, doi:10.1142/9789813148758_0011. Full Text
Everitt, H. O., and F. C. De Lucia. “Detection and recognition of explosives using terahertz-frequency spectroscopic techniques.” Laser-Based Optical Detection of Explosives, 2015, pp. 323–46.
Li, X., et al. “Synergy between thermal and nonthermal effects in plasmonic photocatalysis.” Nano Research, vol. 13, no. 5, May 2020, pp. 1268–80. Scopus, doi:10.1007/s12274-020-2694-z. Full Text
Gutiérrez, Y., et al. “Nanoplasmonic Photothermal Heating and Near-Field Enhancements: A Comparative Survey of 19 Metals.” Journal of Physical Chemistry C, vol. 124, no. 13, Apr. 2020, pp. 7386–95. Scopus, doi:10.1021/acs.jpcc.0c00757. Full Text
Abed Zadeh, A., et al. “Enlightening force chains: a review of photoelasticimetry in granular matter.” Granular Matter, vol. 21, no. 4, Nov. 2019. Scopus, doi:10.1007/s10035-019-0942-2. Full Text
Li, X., et al. “Confirming nonthermal plasmonic effects enhance CO2 methanation on Rh/TiO2 catalysts.” Nano Research, vol. 12, no. 8, Aug. 2019, pp. 1906–11. Scopus, doi:10.1007/s12274-019-2457-x. Full Text
Roberts, A. T., et al. “Plasmonic nanoparticle-based epoxy photocuring: A deeper look.” Materials Today, vol. 27, July 2019, pp. 14–20. Scopus, doi:10.1016/j.mattod.2018.09.005. Full Text
Mohanta, A., et al. “Al doping in ZnO nanowires enhances ultraviolet emission and suppresses broad defect emission.” Journal of Luminescence, vol. 211, July 2019, pp. 264–70. Scopus, doi:10.1016/j.jlumin.2019.03.049. Full Text
Swearer, D. F., et al. “Light-Driven Chemical Looping for Ammonia Synthesis.” Acs Energy Letters, vol. 4, no. 7, May 2019, pp. 1505–12. Scopus, doi:10.1021/acsenergylett.9b00860. Full Text
Karl, N., et al. “Linear and nonlinear optics of switchable terahertz metasurfaces.” Optics Infobase Conference Papers, vol. Part F110-Sensors 2018, 2018. Scopus, doi:10.1364/SENSORS.2018.SeW3J.2. Full Text
Karl, N., et al. “Characterization of switchable terahertz metasurfaces.” 2017 Conference on Lasers and Electro Optics, Cleo 2017 Proceedings, vol. 2017-January, 2017, pp. 1–2.
Karl, N., et al. “Terahertz phase modulation in a slab waveguide metasurface.” International Conference on Infrared, Millimeter, and Terahertz Waves, Irmmw Thz, 2017. Scopus, doi:10.1109/IRMMW-THz.2017.8067114. Full Text
Li, Xueqian, et al. “Using tailored plasmonic photocatalysts for carbon dioxide hydrogenation.” Abstracts of Papers of the American Chemical Society, vol. 253, AMER CHEMICAL SOC, 2017.
Gutiérrez, Y., et al. “Recent advances in metals for plasmonics applications in the UV range.” Proceedings of Spie the International Society for Optical Engineering, vol. 10351, 2017. Scopus, doi:10.1117/12.2273073. Full Text
Karl, N., et al. “Characterization of switchable terahertz metasurfaces.” International Conference on Infrared, Millimeter, and Terahertz Waves, Irmmw Thz, vol. 2016-November, 2016. Scopus, doi:10.1109/IRMMW-THz.2016.7758758. Full Text
Heimbeck, M. S., and H. O. Everitt. “Off-axis Fresnel digital holography at terahertz frequencies.” Optics Infobase Conference Papers, 2016. Scopus, doi:10.1364/DH.2016.DW2E.2. Full Text
Zhang, X., et al. “Plasmonics in the UV range with Rhodium nanocubes.” Proceedings of Spie the International Society for Optical Engineering, vol. 9884, 2016. Scopus, doi:10.1117/12.2227674. Full Text
Karl, N., et al. “Theoretical and Experimental Determination of Surface Susceptibility of Switchable Terahertz Metasurfaces.” 2016 Progress in Electromagnetics Research Symposium (Piers), IEEE, 2016, pp. 706–07.
Golla, D., et al. “Time and energy resolved probing of many-body interactions in graphene and heterostructures.” Optics Infobase Conference Papers, 2014. Scopus, doi:10.1364/ls.2014.ltu4i.4. Full Text