2. 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).
So any plasmonic nanostructures can be
considered as nanoantennas (not very rigid)
3. [1] Javier Aizpurua, "Quantum kisses between optical nanoantennas”, mappingignorance
(2013).
Wave strikes metal nanostructures, energy is transferred to electrons
and resonance occurs when mom. of photons = mom of polaritons
4. y
Φ = Φ (r, θ , ϕ ), scalar _ potential
ε2
E0
ε1
θ
x
E1 = − ∇ Φ 1and∇ Φ 1 = 0
2
E2 = − ∇ Φ 2 and∇ Φ 2 = 0
2
We need to solve Laplace Equation
5. Electric Field in x direction is given by:
Φ 0 = − E0 x = − E0 rcosθ , andΦ 2 = Φ scatter + Φ 0
6. ε1 − ε2 3 cosθ
Applied _ Field = E0
a
ε1 + 2ε2
r2
y
ε2
Φdipole
p cosθ
=
= −E0 r cosθ
2
4πε2 r
E0
ε1
Shows: Field outside = Field due to dipole + Applied_Field
x
7. #
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
.
So nanoantennas cover wide spectrum of
applications
8. 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 different infrastructures such as modeling
software and fabrication engineering
9. •
Long lifetime of exiton polariton
causes recombination
P
0
•
I2
=
3
π
η
∆
l
λ
0
Large ohmic losses and relative finite
skin depth decreasing efficiency and
unfocussed radiation pattern
Need for optimized antenna element and
skin depth
12. 1. Absorbing antenna as
close to Cold sink as possible
Say ¼ wave distance
=>short-circuit (unbalanced
Voltage condition)
Solution:
Coupling capacitance
14. 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
16. Graphene based absorbing antenna
Fabry –Perot Resonance
Chamber (LSPR)
[Stamatios A. Et. Al]
Can be tuned to absorb certain
wavelength
17. P
0
I2
=
3
π
η
∆
l
λ
0
[16] Maciej Klemm. "novel directional nanoantennas for single-emitter sources and
wireless nano-links". International Journal of Optics, 2012(2012), 2012.
18. Basically an idea,
I would do Modelling, FEKO Simulation, Implementation and what
not.
P
0
[1] Circuit implementation
I2
=
3
π
η
∆
l
λ
0
[2] efficiency improvement
[3] good absorbing and radiating elements/ improvisation
19. [1] Javier Aizpurua, "Quantum kisses between optical
nanoantennas”, mappingignorance (2013).
[2] Javier Aizpurua, “Lecture given at SSOP Porquerolles, Sept.
I2
∆
l
2009
P =
π
η
λ
0
[3] Maciej Klemm. "novel directional nanoantennas for single0
3
emitter sources and wireless nano-links". International Journal of
Optics, 2012(2012), 2012
[4] A. Boswell, “amasci
Thank you
