Confined Photons Quiz Answers

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Confined Photons Quiz Answers

Question 1)
Spontaneous emission is an intrinsic property of an atom.

  • True
  • False

Question 2)
Why is photon density of modes different for 2D, 1D and 0D structures?

  • Number of allowed states as a function of energy is a function of confinement
  • Photons have more energy with increasing confinement
  • Dispersion relation changes as a function of confinement
  • None of the above

Question 3)
What is the definition of β, the spontaneous emission enhancement factor?

  • Enhancement of spontaneous emission by laser cavity
  • Fraction of emission that ends up as spontaneous emission
  • Fraction of total spontaneous emission that is coupled into lasing cavity mode
  • None of the above

Question 4)
A thresholdless laser does not have a threshold.

  • True
  • False

Question 5)
Why are whispering gallery mode lasers attractive?

  • Small mode volume
  • Low threshold
  • Nonlinear effects can be enhanced with high intensities
  • All of the above

Question 6)
What are main differences between photonic crystals and crystalline semiconductors in respect to calculating bandstructure for photons and electrons/holes respectively?

  • Different occupation probabilities for electron/holes and photons
  • Photons do not have mass whereas electrons do
  • Cannot achieve bandgaps with photonic crystals
  • (a) and (b) are correct


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