Nanoantenna systems

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Nanoantenna systems

  1. 1. Bhupendra Subedi– University of Missouri Kansas City Kansas City, MO 64111 bsr34@mail.umkc.edu
  2. 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. 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. 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. 5. Electric Field in x direction is given by: Φ 0 = − E0 x = − E0 rcosθ , andΦ 2 = Φ scatter + Φ 0
  6. 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. 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. 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. 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. 10. Tcold η = 1− Thot Simple idea: Recycling of the wasted heat from the cold sink
  11. 11. Hotter Sink gets more hotter Increases efficiency Colder Sink gets more colder
  12. 12. 1. Absorbing antenna as close to Cold sink as possible Say ¼ wave distance =>short-circuit (unbalanced Voltage condition) Solution: Coupling capacitance
  13. 13. Tuned capacitive Coupling Improves power Radiation by 100 folds Coupling Capacitance, A. Boswell, “amasci” Avoids short-circuit; ehhances absorption
  14. 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. 15. P 0 I2 = 3 π η ∆ l λ 0
  16. 16. Graphene based absorbing antenna Fabry –Perot Resonance Chamber (LSPR) [Stamatios A. Et. Al] Can be tuned to absorb certain wavelength
  17. 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. 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. 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. 20. bsr34@mail.umkc.edu

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