Optical Semiconductor Devices - Portland State...
Transcript of Optical Semiconductor Devices - Portland State...
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Optical Semiconductor DevicesOptical Semiconductor Devices
The Foundations of the Laser Diode
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The Development of the Modern The Development of the Modern Laser DiodeLaser Diode
Founding principlesFounding principles
ElectroluminesenceElectroluminesence
Band TheoryBand Theory
Discovery of the LEDDiscovery of the LED
The Challenge of the Laser DiodeThe Challenge of the Laser Diode
Laser Diodes TodayLaser Diodes Today
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Overlooked BeginningsOverlooked Beginnings
Henry J Round (1907)Henry J Round (1907)
Oleg Oleg LosevLosev
(1923)(1923)
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ElectroluminescenceElectroluminescence
Electroluminescence in silicon carbide crystal fibersElectroluminescence in silicon carbide crystal fibers
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The Glowing DiodeThe Glowing Diode
Luminous Luminous carborundum [silicon carborundum [silicon carbide] detector and carbide] detector and detection with detection with crystalscrystals
(1927)(1927)
Light RelayLight Relay
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Band Theory of SolidsBand Theory of Solids
Bonding Structure of Crystal AtomsBonding Structure of Crystal Atoms
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Band Theory of SolidsBand Theory of Solids
Doping of the latticeDoping of the lattice
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Band Theory of SolidsBand Theory of Solids
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Schottky DiodeSchottky Diode
Band Diagram of a Schottky DiodeBand Diagram of a Schottky Diode
vc EEhc
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LED ConstructionLED Construction
Edge Emitting LEDEdge Emitting LED
Surface Emitting LEDSurface Emitting LED
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Why LEDWhy LEDs?s?
High Internal Quantum High Internal Quantum Efficiency RatingsEfficiency Ratings
High overall efficiency ratingHigh overall efficiency rating
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LED SpectrumLED Spectrum
Many Frequencies PossibleMany Frequencies Possible
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Laser Diode ChallengesLaser Diode Challenges
Wavelength SpectrumWavelength Spectrum
Random Light EmissionRandom Light Emission
Phase Phase CoheranceCoherance
HeatHeat
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The Challenge of LasingThe Challenge of Lasing
ProblemsProblems
Large Injection CurrentLarge Injection Current
Additional HeatAdditional Heat
SolutionsSolutions
Pulse OperationPulse Operation
Active CoolingActive Cooling
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CollimationCollimation
Cleaved Mirror Resonator CavityCleaved Mirror Resonator Cavity
Laser Diode
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So What About the Heat?So What About the Heat?
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The SolutionThe Solution
Advances in Materials ProductionAdvances in Materials Production
HeterostructuresHeterostructures
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HeterojunctionHeterojunction
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Double HeterojunctionDouble Heterojunction
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Double Heterojunction VisualizationDouble Heterojunction Visualization
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Thank You
References(1) http://hyperphysics.phy-astr.gsu.edu/Hbase/solids/
(2) S. M. Sze, Physics of Semiconductor Devices, 2nd ed., John Wiley & Sons, New York, 1981(3) E. Fred Schubert, Light-Emitting Diodes, 2nd ed., Cambridge University Press, New York, 2006
(4) Mitsuo Fukuda, Optical Semiconductor Devices, John Wiley & Sons, New York, 1999(5) B Van Zeghbroeck, http://ece-www.colorado.edu/~bart/book/movie/movie1.htm, 2004
http://ece-www.colorado.edu/~bart/book/movie/movie1.htm
Optical Semiconductor DevicesThe Development of the Modern Laser DiodeOverlooked BeginningsElectroluminescenceThe Glowing DiodeBand Theory of SolidsBand Theory of SolidsBand Theory of SolidsSchottky DiodeLED ConstructionWhy LEDs?LED SpectrumLaser Diode ChallengesThe Challenge of LasingCollimationSo What About the Heat?The SolutionHeterojunctionDouble HeterojunctionDouble Heterojunction VisualizationThank You