EE 150 Section 2 Nanophotonics

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EE 150 Section 2Nano-photonics

• Instructors John Hong, Demetri Psaltis
• TA Mankei Tsang
• Tues/Thurs 4-530PM
• 104 Watson

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Class Information

• Physics and applications of subwavelength feature
  optics
• Reading course pass/fail
• 18 class meetings
• Scheduled research paper reviews by students
• Discussions
• John Hong
• 818 354 0720 JPL
• 805 300 2594 cell (best bet)
• John.hong_at_jpl.nasa.gov

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Topic Schedule
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Topic Schedule Contd

• Single molecule imaging by zero mode waveguide
• Photonic bandgap structures
• Photonic bandgap structures
• Holey fibers
• Evanescent holography for nano features
• Fabrication techniques
• Nanostructure self assembly

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Research Review Guidelines

• Understand basic concepts first!
• Plan 45 minute presentation to allow full
  discussions
• Suggested outline
• Basic concept explanation
• State key experimental / theoretical results
• Present supporting discussions / details
• Applications
• Future research directions

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Nano-optics Previews

• Theoretical framework Maxwells eqns
• Near/Far fields dipole antenna
• NSOM
• Photonic bandgap structures
• Plasmonics
• Holey fibers

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• Far field radiation
• Locally plane wave TEM
• Field 1/r
• Near field
• Field 1/r2, 1/r3
• Reactive fields (localized)
• E H in quadrature

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Optical Microscopy

• Rayleigh criterion
• Resolving two equal intensity airy spots
• Separation 0.61 l0 / NA (circular aperture)
• Practical limitations 0.5um _at_ visible

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Near Field Microscopy

• Subwavelength aperture
• Near field defined by evanescent regime length
  scale
• Free space dispersion relation
• Lateral scale
• Evanescent (near field) scale

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NSOM
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3D Imaging with Zero Mode WG
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Photonic Bandgap

• One Dimensional Example (layered media)
• Period L a b, index na, nb
• Dispersion

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3D PBG

• Forbidden propagation in all directions for
  finite bandwidth

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2D PBG

• Planar waveguide with 2D periodic structure
• Defect (missing hole) will confine light

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2D PBG
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2D PBG Waveguide
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Holey Fibers

• 2D PBG in transverse cross section
• Allow propagation along axis
• Extra design degree of freedom

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Nanoparticle Waveguide

• Energy transfer along discrete array of
  nanoparticles
• Excitation and coupling of plasmon resonances
  (lumped element t-line)

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Plasmon WG
T-pol
Coupling d-3
L-pol
T to L
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Far Field from Nanostructure

• Gray level mask by area modulation
• Subwavelength apertures

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Holography
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Surface Hologram

• Recording and reconstruction of evanescent fields
• TIR reference waves
• Planar guided reference waves