can be thought of as waves of electrons in a metal surface. More specifically, plasmons are charge density oscillations in a metal or other conductive materials. A light incident on a metal surface can generate plasmons similar to how wind incident on water can generate waves. Light can create plasmons, and the oscillating charges of plasmons can also generate light. The plasmonic-optical interactions give rise to interesting physics at the nanoscale. See also: What is a Plasmon?
or nanophotonics is the study of light on the nanoscale. Typically visible light is limited by the diffraction limit and cannot be focused down to sizes smaller that about half the wavelength of visible light, less than hundreds of nanometers. Nano-optics deals with ways to overcome this diffraction limit in order to manipulate light at scales that are smaller than 100 nm. Plasmonics is one area of nano-optics. Plasmonic nanostructures can focus light to regions that can be less than 10 nm! Additionally, focusing light to such a small, highly-localized volume also generate extremely large optical enhancements in this nanoscale region. These enhancements can be used for applications including single molecule detectors 
, enhanced spectroscopies 
, cancer treatment 
, and more efficient solar cells 
See here for description of current Research Projects and Areas
Interested in joining the group? How to join my Research Group
October 1, 2014 - Upcoming invited talks
- J. B. Herzog has been invited to present his latest research at two events next month:Nov 7
- Arkansas INBRE Research Conference,
, Fayetteville, AR.Nov 12
- LI/LA-SiGMA Seminar Series
, LSU, Baton Rouge, LA.
Herzog Invited AR/LA Boot Tour, November 2014!
September 16, 2014 - Student SPIE articles published online -
Hill et al., Computational electromagnetic analysis of plasmonic effects in interdigital photodetectors,
- Proc. SPIE 9163, (2014) doi:10.1117/12.2074251
Bauman et al., Optical nanogap matrices for plasmonic enhancement applications,
- Proc. SPIE 9163, (2014) doi:10.1117/12.2061899
Mishler et al., Diatom frustule photonic crystal geometric and optical characterization,
- Proc. SPIE 9171, (2014) doi:10.1117/12.2062287
September 8, 2014 - Avery, Stephen, and Jonathan honored for Newport Research Excellence Awards - Members of the Herzog Lab (Avery, Stephen, and Jonathan) were honored at SPIE Optics + Photonics international conference in San Diego for being selected for the Newport Research Excellence Awards. UoA Newswire article about the event is here
Newport Research Excellence Award Recipients with SPIE president and Newport Vice-President
August 19, 2014 - Herzog and Natelson file US Patent Application - J. B. Herzog and D. Natelson filed a patent application on the newly developed nanomasking technique: Systems and Methods for Fabricating Nanostructures and Nanogaps. US Patent Application 62/039,337, filed August 2014
August 17, 2014 - Group members attend Optics + Photonics Conference - Group members will be attending and presenting at the SPIE Optics + Photonics Conference in San Diego, CA. Come to our presentations to see out latest research.
Herzog Lab Presentations:
- Tue 5:00pm Room 10:
- J. Mishler, Diatom frustule photonic crystal geometric and optical characterization
- Wed 8:00am Room 6B:
- S. Bauman, Optical nanogap matrices for plasmonic enhancement applications
- Wed 5:30-7:30pm Exhibit Hall B1 (Poster):
- A. Hill, Computational electromagnetic study of plasmonic effects in interdigital arrays
August 1, 2014 - Saeed joins research group - After a brief trial period, Saeed Sarollahi has joined the Herzog Lab. Saeed will be starting as a first-year graduate student in the microEP program this month, and he plans to do computational research on photonic crystal waveguides.
July 23, 2014 - Eric Novak presents research at seminar - Eric Novak, a microEP REU student who joined the lab this summer presented the results of his summer research at the end of the year seminar. Eric did excellent plasmonic research this summer, and contributed as a co-author to Stephen's SPIE paper that will be presented in August. See Video 2 to view an example of his results.
July 15, 2014 - Students awarded travel grants - Stephen Bauman, Avery Hill, and Jonathan Mishler - all who will be presenting at the SPIE Optics + Photonics conference in August have been awarded travel grants. Congrats on their hard work! Thank you also to the funding organizations! The grants include:
- 2014 SPIE Student Author Travel Grant sponsored by Newport Research Excellence Awards
- 2014 Graduate School Travel Grant (University of Arkansas)
- 2014 Honors College Travel Grant Award (University of Arkansas)
- 2014 SPIE Officer Travel Grant Award
Joseph B. Herzog, PhD
Office: PHYS 237
Office Phone: 5-4217
Lab Phone: 5-2007
Email: jbherzog uark.edu
Lab: PHYS 245
Computational electromagnetic model of plasmonic nanogap array. Large optical enhancement can be seen at the nanoscale gap.