Light-Matter Interaction
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What are the two types of Electron-Hole pairs in light-matter interactions, and what do they do? ***
1) Recombination → Produces Light *** 2) Generation → Cause by incident light promotes electrons ***
What does the P-N Junction do in Recombination?
• Current can produce Light to → Light Emitting Diode (LED) • Higher to Low Photon
What does the P-N Junction do in Generation? Hint: E-H pairs
• Electron-Hole pairs can be seperated into → Current into → Photodectors
In Phonon Dispersion, what does the (ω) stand for?
ω → Scattering Angular Frequency Remember: Also ω - Angular Velocity
In Phonon Dispersion, k = 2π/λ. What does is stand for?
k = 2π/λ → Scattering Magnitude
In a Phonon Dispersion Graph, when the slope is near k = 0, what does this represent?
Lower Branch = Speed Of Sound (Acoustic)
In a Phonon Dispersion Graph, when the slope is near k = ±π/a, what does this represent? **
Slope near k = ±π/a → Standing Waves **
In a Phonon Dispersion Graph, Heat Capacity can be calculated by using 2 curves, a red and blue curve. What do these represent?
Blue Curve (Optical) = Speed Of Light Red Curve (Acoustic) = Speed Of Sound
When photons are released they go from ….
Photons released go from Conduction band to → Valence band
When photons are absorbed they go from….
Photons absorbed go from Valence band to → Conduction band