Publications
| Authors | Title | Year | Journal/Proceedings | Reftype | DOI/URL |
|---|---|---|---|---|---|
| Chan, H. B., Marcet, Z., Woo, K. & Tanner, D. B. | Optical transmission through double-layer metallic subwavelength slit arrays | 2005 | Optics Letters | Article | URL |
| Abstract: We present measurements of transmission of infrared radiation through double-layer metallic grating structures. Each metal layer contains an array of subwavelength slits and supports transmission resonance in the absence of the other layer. The two metal layers are fabricated in close proximity to allow coupling of the evanescent field on individual layers. The transmission of the double layer is found to be surprisingly large at particular wavelengths, even when no direct line of sight exists through the structure as a result of the lateral shifts between the two layers. We perform numerical simulations using rigorous coupled wave analysis to explain the strong dependence of the peak transmission on the lateral shift between the metal layers. | |||||
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| Chan, H. B., Marcet, Z., Carr, D., Bower, J. E., Cirelli, R., Ferry, E., Klemens, F. P., Miner, J. F., Pai, C. & Taylor, J. A. | Transmission Enhancement in an Array of Subwavelength Slits in Aluminum Due to Surface Plasmon Resonances | 2005 | Bell Labs Technical Journal | Article | DOI |
| Abstract: The coupling of light to surface plasmons through periodic subwavelength metallic structures could strongly modify the optical properties of a metal film. We demonstrate that the optical transmission through an array of subwavelength slits is as high as 80% at resonance, even though the width of each slit is almost 10 times smaller than the wavelength and the slits occupy only 25% of the area of the metal. Numerical calculations suggest that the field intensity is strongly enhanced near the metal surface. The field enhancement could be used for generating nonlinear optical effects and for high sensitivity detection of nanomechanical displacement. | |||||
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Talks/Presentations
| Author | Title | Year | Conference | Reftype | DOI/URL |
|---|---|---|---|---|---|
| Z. MARCET, J. PASTER, H. B. CHAN, D. W. CARR, J. E. BOWER, R. CIRELLI, F. P. KLEMENS, W. M. MANSFIELD, J. F. MINER, C. S. PAI, J. A. TAYLOR, | Controllable evanescent field coupling between metallic bilayers of subwavelength apertures | 2008 | APS March Meeting, New Orleans, LA | Talk | URL |
| Abstract: The optical transmission through a periodical array of subwavelength apertures in a metal film can be extraordinarily high due to resonance of the incident light with surface excitations, accompanied by dramatic enhancement of the local electromagnetic field on the metal surfaces. We have fabricated subwavelength slit arrays in two layers of metal. The two layers are positioned su±ciently close to each other so that the evanescent fields couple strongly at resonance. Depending on the lateral shift between the two layers, the transmission changes from near zero to a value that exceeds single layer transmission. Moreover, the phase delay of the transmitted light depends strongly on the lateral shift. We present both numerical simulations and experimental data to demonstrate that by tuning the lateral shift, an extra phase delay of pi can be introduced while the transmission remains near maximum. The controllable phase delay in bilayer subwavelength structures opens new capabilities that cannot be achieved with single layers. | |||||
BibTeX:
@article{Marcet2008t,
}
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| Marcet, Z., Woo, K., Tanner, D., Carr, D., Chan, H.B. | Optical transmission through metallic bilayers with subwavelength apertures | 2005 | SESAPS November Meeting, Gainesville, FL | Talk | URL |
| Abstract: The optical transmission through a periodical array of subwavelength apertures in a metal film can be strongly enhanced by resonance of the incident light with surface plasmon polaritons and/or diffracted evanescent waves. The excitation of surface waves is accompanied by a dramatic enhancement of the local electromagnetic field on the metal surfaces. We have fabricated subwavelength structures consisting of two layers of metal. The metal layers are positioned sufficiently close to each other such that the evanescent fields of the surface plasmons generated in the first layer excite surface plasmons in the second layer. In some cases the two metal layers are laterally displaced such that no direct line of sight exists through the structure. Nevertheless, the transmission through a number of these devices remains remarkably high at resonance, comparable to the single layer value. We will discuss the dependence of the optical transmission on various sample parameters, including metal layer thickness, separation, lateral shift and incident angle of light. | |||||
BibTeX:
@article{Marcet2005t,
}
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| Marcet, Z. & Reinhold, J. | Collection Efficiency of Photomultipliers for an Aerogel \v Cherenkov Detector | 2002 | SESAPS October Meeting, Auburn, AL | Poster Presentation | URL |
| Abstract: An aerogel \v Cerenkov detector is being developed for trigger level particle identification for a hypernuclear spectroscopy experiment at Jefferson Lab. The detector will employ 5 inch photomultipliers (PMT) that will have to be operated in the vicinity of a magnetic spectrometer. The effect of magnetic fields on the PMT's collection efficiency has been studied with a test setup consisting of a pulsed LED and a pair of Helmholtz coils. Results of unshielded PMTs will be compared to those enclosed by a magnetic shield. | |||||
BibTeX:
@article{Marcet2002p,
}
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Created by JabRef on 06/01/2008.