Lecture2-228a

Lecture2-228a - ECE 228A Fall 2011 Daniel J. Blumenthal 2.1...

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Unformatted text preview: ECE 228A Fall 2011 Daniel J. Blumenthal 2.1 Lecture 2- Photon Statistics and Basics of Propagation in Dielectric Media ECE 228A Fall 2011 Daniel J. Blumenthal 2.2 Photodetection ECE 228A Fall 2011 Daniel J. Blumenthal 2.3 Detection of Optical Signals Thermal: Temperature change with photon absorption Thermoelectric Pyromagnetic Pyroelectric Liquid crystals Bolometers Wave Interaction: Exchange energy between waves at different frequencies Parametric down-conversion Parametric up-conversion Parametric amplication Photon Effects: Generation of photocarriers from photon absorption Photoconductors Photoemissive Photovoltaics ECE 228A Fall 2011 Daniel J. Blumenthal 2.4 Photon Statistics Photon sources can in general be characterized as coherent or incoherent Coherent: Probability that a photon is generated at time t is mutually independent of probability of photons generated at other times (Markov Process) Poisson Process: Probability of nding n photons in time interval T Bunching is a trait of the Poisson process Interarrival time is decaying exponentially distributed P ( n | T ) = ( rT ) n e rT n ! t T Where : P(n|T) is probability of nding n photons in time interval T R is mean photon arrival rate (photons/second) Can also be a combination of these two types -> partially coherent ECE 228A Fall 2011 Daniel J. Blumenthal 2.5 Photon Statistics (II) Narrowband Thermal (Gaussian): Bose-Einstein Process: Probability of nding n photons in time interval T P ( n ) = 1 1 + n b !...
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Lecture2-228a - ECE 228A Fall 2011 Daniel J. Blumenthal 2.1...

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