Extraordinary infrared transmission through a periodic bowtie aperture array.

School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA.
Optics Letters (Impact Factor: 3.18). 04/2010; 35(7):992-4. DOI: 10.1364/OL.35.000992
Source: PubMed

ABSTRACT The discovery of extraordinary transmission through periodic aperture arrays has generated significant interest. Most studies have used circular apertures and attributed enhanced transmission to surface plasmon polariton (SPP) resonances and/or Rayleigh-Wood anomalies (RWA). Bowtie apertures concentrate light and have much longer cutoff wavelengths than circular apertures and can be designed to be strongly resonant. We demonstrate here that the total transmission through a bowtie aperture array can exceed 85% (4x the open area). Furthermore, we show that the high transmission is due to waveguide modes as opposed to the commonly believed SPP/RW phenomena. This work is focused on IR wavelengths near 9 microm; however, the results are broadly applicable and can be extended to optical frequencies.

Download full-text


Available from: Edward C Kinzel, Jul 01, 2015
  • Source
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Recent advances in nanotechnologies have prompted the need for tools to accurately and non-invasively manipulate individual nano-objects. Among the possible strategies, optical forces have been predicted to provide researchers with nano-optical tweezers capable of trapping a specimen and moving it in three dimensions. In practice, however, the combination of weak optical forces and photothermal issues has thus far prevented their experimental realization. Here, we demonstrate the first three-dimensional optical manipulation of single 50 nm dielectric objects with near-field nanotweezers. The nano-optical trap is built by engineering a bowtie plasmonic aperture at the extremity of a tapered metal-coated optical fibre. Both the trapping operation and monitoring are performed through the optical fibre, making these nanotweezers totally autonomous and free of bulky optical elements. The achieved trapping performances allow for the trapped specimen to be moved over tens of micrometres over a period of several minutes with very low in-trap intensities. This non-invasive approach is foreseen to open new horizons in nanosciences by offering an unprecedented level of control of nanosized objects, including heat-sensitive biospecimens.
    Nature Nanotechnology 03/2014; 9:295-299. DOI:10.1038/nnano.2014.24 · 33.27 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Weak absorption of light near the band gap is one limiting factor on the efficiency of photovoltaics. This is particularly true for thin-film solar cells because the short optical path lengths and limited options for texturing the front and back surfaces. Scattering light laterally is one way to increase the optical path length to increase the chance that a given low energy photon is absorbed. We investigate the use of a periodic array of bowtie apertures to couple incident light to parallel plate waveguide modes supported between two conductors. We show that this increases the efficiency of solar cells by 39% and explain the physical mechanisms. This architecture has potential for thin film photovolatics or for forming an intermediate conductor in multi-junction solar cells.
    Proceedings of SPIE - The International Society for Optical Engineering 08/2010; DOI:10.1117/12.859888 · 0.20 Impact Factor