Bhupendra Subedi– University of Missouri Kansas City
Kansas City, MO 64111
bsr34@mail.umkc.edu
Antenna: converts radiation energy to
localized energy and vice versa
analogous to
phenomena in the surface of the metalli...
[1] Javier Aizpurua, "Quantum kisses between optical nanoantennas”, mappingignorance
(2013).
Wave strikes metal nanostruc...
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 ne...
Electric Field in x direction is given by:
Φ 0 = − E0 x = − E0 rcosθ , andΦ 2 = Φ scatter + Φ 0
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 outs...
#
Areas of Application
Application and devices
1.
Nanophotonics
detectors, filters and lasers eg. maskless optical
li...
Conventional Antennas
Nanoantennas
•
Fed by real current, EM
resonance causes waves
•
Fed by localized current, Surfa...
•
Long lifetime of exiton polariton
causes recombination
P
0
•
I2
=
3
π
η
∆
l
λ
0
Large ohmic losses and relative f...
Tcold
η = 1−
Thot
Simple idea: Recycling of the wasted
heat from the cold sink
Hotter Sink
gets more
hotter
Increases
efficiency
Colder Sink gets
more colder
1. Absorbing antenna as
close to Cold sink as possible
Say ¼ wave distance
=>short-circuit (unbalanced
Voltage condition)
...
Tuned capacitive
Coupling
Improves power
Radiation by 100
folds
Coupling Capacitance, A. Boswell, “amasci”
Avoids short-c...
Nano-rectifiers
Not easy to channel heat radiations
These waves are vibrating in infra red or even THz frequency
that toda...
P
0
I2
=
3
π
η
∆
l
λ
0
Graphene based absorbing antenna
Fabry –Perot Resonance
Chamber (LSPR)
[Stamatios A. Et. Al]
Can be tuned to absorb cert...
P
0
I2
=
3
π
η
∆
l
λ
0
[16] Maciej Klemm. "novel directional nanoantennas for single-emitter sources and
wireless nan...
Basically an idea,
I would do Modelling, FEKO Simulation, Implementation and what
not.
P
0
[1] Circuit implementation
I2...
[1] Javier Aizpurua, "Quantum kisses between optical
nanoantennas”, mappingignorance (2013).
[2] Javier Aizpurua, “Lecture...
bsr34@mail.umkc.edu
of 20

Nanoantenna systems

Published on: Mar 3, 2016
Published in: Technology      Business      
Source: www.slideshare.net


Transcripts - Nanoantenna systems

  • 1. Bhupendra Subedi– University of Missouri Kansas City Kansas City, MO 64111 bsr34@mail.umkc.edu
  • 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
  • 10. Tcold η = 1− Thot Simple idea: Recycling of the wasted heat from the cold sink
  • 11. Hotter Sink gets more hotter Increases efficiency Colder Sink gets more colder
  • 12. 1. Absorbing antenna as close to Cold sink as possible Say ¼ wave distance =>short-circuit (unbalanced Voltage condition) Solution: Coupling capacitance
  • 13. Tuned capacitive Coupling Improves power Radiation by 100 folds Coupling Capacitance, A. Boswell, “amasci” Avoids short-circuit; ehhances absorption
  • 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
  • 15. P 0 I2 = 3 π η ∆ l λ 0
  • 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
  • 20. bsr34@mail.umkc.edu

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