Embed Size (px)
DESCRIPTION
Citation preview
So any plasmonic nanostructures can be considered as nanoantennas (not very rigid)
Antenna: converts radiation energy to localized energy and vice versa
analogous to
phenomena in the surface of the metallic nanostructures (optical frequency) called Localized Surface Plasmon Resonance
(LSPR).
Wave strikes metal nanostructures, energy is transferredto electrons and resonance occurs when mom. of photons = mom of polaritons
[1] Javier Aizpurua, "Quantum kisses between optical nanoantennas”, mappingignorance (2013).
θ
ε1
ε2
E0x
y
We need to solve Laplace Equation
Electric Field in x direction is given by:
E0
x
y
ε1
ε2
Shows: Field outside = Field due to dipole + Applied_Field
So nanoantennas cover wide spectrum of applications
.# Areas of Application Application and devices
1. Nanophotonics detectors, filters and lasers eg. maskless optical lithography, NSOM
2. Plasmonic Solar Cells rectennas using ALD technology
3. Metamaterials optical/EM sheilding and invisibility cloaks
4. Chemical and bio/medical sensing and optical devices
super lenses for medical sensing, medical cancer treatment; gases and radiation sensors
5. On-Chip Interconnect on-chip nanoantennas
Need for different infrastructures such as modeling software and fabrication engineering
Conventional Antennas Nanoantennas• Fed by real current, EM
resonance causes waves• Fed by localized current,
Surface Plasmon Polaritons causes waves
• Demands classical treatment
• Demands QM treatment
• Dissipated power related to voltage and current
• Dissipated power related to Green’s function tensor and Local density of state (LDOS)
Need for optimized antenna element and skin depth
• Long lifetime of exiton polariton causes recombination
• Large ohmic losses and relative finite skin depth decreasing efficiency and
unfocussed radiation pattern
Simple idea: Recycling of the wasted
heat from the cold sink
Hotter Sink gets more
hotter
Colder Sink gets
more colder
Increases
efficiency
1. Absorbing antenna as
close to Cold sink as possible
Say ¼ wave distance
=>short-circuit (unbalanced
Voltage condition)
Solution:
Coupling capacitance
Coupling Capacitance, A. Boswell, “amasci”
Tuned capacitive
Coupling
Improves power
Radiation by 100
folds
Avoids short-circuit; ehhances absorption
Nano-rectifiers
Not easy to channel heat radiations
These waves are vibrating in infra red or even THz frequency
that todays commercial rectifiers can’t handle
Nano-rectifiers 100-1,000 X smaller rectifiers needed
Graphene based absorbing antenna
Fabry –Perot Resonance
Chamber (LSPR)
[Stamatios A. Et. Al]
Can be tuned to absorb certain wavelength
[16] Maciej Klemm. "novel directional nanoantennas for single-emitter sources and wireless nano-links". International Journal of Optics, 2012(2012), 2012.
[1] Circuit implementation
[2] efficiency improvement
[3] good absorbing and radiating elements/ improvisation
Basically an idea,
I would do Modelling, FEKO Simulation, Implementation and what not.
[1] Javier Aizpurua, "Quantum kisses between optical nanoantennas”, mappingignorance (2013).
[2] Javier Aizpurua, “Lecture given at SSOP Porquerolles, Sept. 2009
[3] Maciej Klemm. "novel directional nanoantennas for single-emitter sources and wireless nano-links". International Journal of Optics, 2012(2012), 2012
[4] A. Boswell, “amasci
Thank you
