SURFACE PLASMON RESONANCE NANOLASERS
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13-12-2010, 10:50 PM


SURFACE PLASMON RESONANCE NANOLASERS
HARIPRASAD.K
S7B


OVERVIEW
INTRODUCTION
WHAT IS SPR?
SURFACE PLASMON SPECTROSCOPY
LASER BASICS
SPASER
THEORY OF SPASER
COMPARING LASER & SPASER
DEMONSTRATION OF SPASER
ADVANTAGES
APPLICATIONS
CONCLUSION & FUTURE SCOPE
REFERENCES


.pptx   SURFACE PLASMON RESONANCE NANOLASERS.pptx (Size: 544.22 KB / Downloads: 179)

Introduction
Surface plasmons
oscillations of electrons
found in boundary b/w metal & dielectric
intensity max across the surface

How to excite a SP?
using p-polarised light



Otto configuration Kretschmann configuration




Surface plasmon spectroscopy
To measure : - thickness changes,
- density fluctuation
- molecular adsorption

laser basics
High conc. of energy & monochromatic light

Stimulated emission of coherent photons

Electrons generate photos




Laser basics
Absorption

Spontaneous & Stimulated emission

Optical pumping

Optical resonators

Distance between mirrors is a main factor

spaser
What is a spaser?

Quantum generator of surface plasmon

Nanoplasmonic counterpart of laser

Temporarily coherent near atomic intensity field

Ultrafast

Theory of spaser
Based on two level emitters- quantum dots
Energy transfer is radiationless
Resonant nanosystem acts as a laser cavity
Theory of spaser
Comparing laser and spaser
Laser – photons. Spasers – surface plasmons

Resonant cavity replaced by nanoparticle

Surface plasmons have spin just as photons

Energy source(gain medium) excited externally

Both undergo stimulated emission

Laser-half the wavelength
Demonstration of spaser
Spaser in gold nanoparticle surrounded by silica shell impregnated with green dye.( By Mikhail Noginov)
Demonstration of spaser
Spaser containing cadmium sulphide on top of silver substrate separated by magnesium fluoride (By Zhang & Oulton)
Advantages
SP can confine within tighter spots

Ultrafast than MOSFETs

Heating effect localized on nanocsale

Highly resistant to temp. & adverse envt.


Applications of spasers

Nanoscale lithography, microscopy

Nanoscale optical probing

Optical computing

Analyzing individual molecules

Magnetic data storage enhancement
Conclusion & Future scope
Spaser driven by an electrical source

Design spaser analogous to MOSFET transistor
REFERENCES
M.I.Stockman and D.J.Bergman, “Quantum nanoplasmonics: Surface Plasmon Amplification by Stimulated Emission of Radiation (SPASER),” in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference,paper QThPDA10.
M. I. Stockman, Spaser as Nanoscale Generator and Ultrafast Amplifier, J.Opt. 12, 024004-1-13 (2010)
“The Spaser Nanolaser”, IEEE Spectrum, October 2009
M. I. Stockman, Spasers Explained, Nature Photonics 2, 327-329 (2008)
wikipedia.com



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amrinsara
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29-08-2011, 08:19 PM

spaser-the nanolaser seminar and presentation report
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