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Wavelength selectivity of on-axis surface plasmon laser filters
- Source :
- Journal of Physics D: Applied Physics. 35:2516-2519
- Publication Year :
- 2002
- Publisher :
- IOP Publishing, 2002.
-
Abstract
- Excitation of surface plasmons on a metal substrate, via the attenuated total reflection method can theoretically offer preferential absorption of light at one particular wavelength, whilst reflecting the nearby spectrum. Normally this `filtering' action is limited to removal of p-polarized light, and the acceptance angle of such a filtering device is very narrow, which limits practical applications, such as separation of fundamental and laser harmonics. The possibility of avoiding this angular precision is explored by considering the complex permittivity of metal composites. By using a two or more layer structure, as opposed to a single metal substrate, the acceptance angle of the device can be broadened, by a factor of about 15 times. An example is discussed for separation of the fundamental and harmonics from a Nd : YAG laser. Variants of the structure allow the design of an in-line transmission filter for the various wavelengths with sufficient angular tolerance to include focusing lenses. Avoidance of laser ablation of the metal is discussed.
- Subjects :
- Laser ablation
Materials science
Acoustics and Ultrasonics
business.industry
Surface plasmon
Physics::Optics
Optical polarization
Condensed Matter Physics
Laser
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
law.invention
Wavelength
Optics
law
Acceptance angle
business
Optical filter
Plasmon
Subjects
Details
- ISSN :
- 00223727
- Volume :
- 35
- Database :
- OpenAIRE
- Journal :
- Journal of Physics D: Applied Physics
- Accession number :
- edsair.doi...........07eb6bd3d5ba9ea6bd9f64346733e826