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 ampli¡cation 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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This note was uploaded on 11/24/2011 for the course ECE 228a taught by Professor Bowers,j during the Fall '08 term at UCSB.

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

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