Skip to Main Content
 

Global Search Box

 
 
 
 

ETD Abstract Container

Abstract Header

Plasmonic Sensing And Spectroscopy of Subwavelength Particles with an Infrared Microscope

Malone, Marvin, Jr.

Abstract Details

2012, Doctor of Philosophy, Ohio State University, Chemistry.
Sensing and spectral measurements of subwavelength particles have been accomplished using an infrared microscope by placing particles in the subwavelength holes of a patterned thin metal film, i.e. a plasmonic mesh. When particles are the same size as the wavelength of light, they scatter light very efficiently and exhibit other unusual spectral effects. Spectroscopic results are presented of polystyrene microspheres, yeast cells, and previously airborne dust particles. Although the transmission spectrum of mesh under a microscope is a good background for studying subwavelength particles, it is bad for studying the plasmonics of mesh. Light incident on the mesh under an infrared microscope is from a ring of off-axis angles (17-37°) which differs greatly from the perpendicular incidence of a benchtop FTIR. Since surface plasmon polariton mediated resonances disperse with angle as a result of a change in the wavevector, k, the microscope was modified with the addition of an aperture to reduce the range of angles. Results are presented on the study of the plasmonics of Ni mesh under a modified infrared microscope. The results characterize fundamental aspects of surface plasmon mediated resonances on mesh including: an effective refractive index characterizing the strength of the interaction of infrared light with the metal’s conducting electrons, the strength of the coupling between the front and back surfaces of mesh, and the interaction strength between two resonances, the (-1,0) and (0,-1), by means of the bandgap which results from an avoided crossing.
James Coe (Advisor)
Heather Allen (Committee Member)
Sherwin Singer (Committee Member)
229 p.

Recommended Citations

Citations

  • Malone, Jr., M. (2012). Plasmonic Sensing And Spectroscopy of Subwavelength Particles with an Infrared Microscope [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354561034

    APA Style (7th edition)

  • Malone, Jr., Marvin. Plasmonic Sensing And Spectroscopy of Subwavelength Particles with an Infrared Microscope. 2012. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1354561034.

    MLA Style (8th edition)

  • Malone, Jr., Marvin. "Plasmonic Sensing And Spectroscopy of Subwavelength Particles with an Infrared Microscope." Doctoral dissertation, Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354561034

    Chicago Manual of Style (17th edition)