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Theories and asicConcept of Light
JAN FERN H
BS Electronics and Communications
Optoelectronics Engr. Joybelle b
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a : something that makes vis
b : the sensation aroused by stimulation of the visua
c : electromagnetic radiation of any wavetravels; such radiation that is visible to the
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It is a special ki
electromagnetic en
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Sources of LightIncandescent lightlight prodby heating an object until it glo
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Fluorescent Light Light produced by electron bombardm
gas moleculesPhosphors absorb photons that are creawhen mercury gas gets zapped with eleThe phosphors glow & produce light.
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Optoelectronicsvs.photonics Vs. Electro
Photonics - the technology
generating and harnessing liwhose quantum unit is the pho
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Optoelectronicsvs.photonics Vs. Electro
Optoelectronics - to a deviceresponds to optical power, emmodifies optical radiation or u
optical radiation for its internoperation.
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Optoelectronicsvs.photonics Vs. Electro
Electro-Optics - to a device that respoptical power, emits or modifies op
radiation or utilizes optical radiationinternal operation or any devicefunctions as an electrical-to-optic
optical-to electrical transducer.
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History of Optics Early (ca 1200 BCE)Bible Passage of Exod
The Use of Mirrors
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History of OpticsIBN AL-HAYTHAM (965 in Basra - c. 1039 in Ca
Father of Optics
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History of optics
Newton (17thCentury)asserted that light was formvery tiny corpuscles (particles).
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History of OpticsHuygens (17thCentury)
that light was a wave, basing this affon its undulatory (wave like) characconcept of etherwas introduced.
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History of Optics
Michelson and MorleysEther does not exist.Speed of light is constant.
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History of Optics
Planck and EinsteinUndulatory Theory is not truCorpuscle Theory - Photon
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General Characte
Speed = 2.99 x 10 8m/s in a vacuum state.
0.03 % lesser in air and 30.0 % slower
It travels in a straight line at fixed speed, one energy from one place to anot
Can be represented with magnitude anddirection.
Wave-Particle Duality
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TRIVIA
Detection and measurement o
light energy is called radiomet
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The Dual NatDeveloped models to
effects of ligh
Light can behave as a wave
Light can behave like a discreparticle (quantum)
The Concept of a Photon
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The Concept of PhotonThe particle-like of nature of l
modelled with photons.Based on Sir Albert Einstei
Photoelectric effect
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The Concept of PhotonPhoton has no mass and no chais a carrier of electromagnetic e
and interacts with other dparticles like electrons, atommolecules.
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The Concept of Photon
A beam of lightis modelled asa stream of
photons.
Each Photona well-deenergy th
dependent uwavelength
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The Concept of Photon The Photon Energy can be compute
=
Where: E = Photon Energy (Joules)h = Plancks Constant = 6.625 x 10 -34(
C = speed of light (m/s)= wavelength (m)
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The Dual NatDeveloped models to
effects of ligh
Light can behave as a wave
The Concept of a PhotoThe Concept of Waves
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The Wave ModelLight was first described as a w
due to its behaviour.
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The Wave ModelUsed to describe fine-scale esuch as interference and diffra
that occur when light passes thsmall openings or by sharp ed
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The Wave ModelUsed to describe fine-scale esuch as interference and diffra
that occur when light passes thsmall openings or by sharp ed
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The Wave ModelThe propagation of light or electrom
energy can be described as a travwave in motion. The wave moves ewithout moving massfrom one pl
another at a speed independent intensity or wavelength.
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The Wave ModelThis wave nature of light is theof physical optics and describ
interaction of light with med
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Light as a WAVE
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The Wave ModelThe wave carries light energy withamount of energy that flows per s
across a unit area perpendiculardirection of travel is called thirradiance (flux density) of the w
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The Duality of Light
Metal Plate
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WAVE MODEL OF LIGExplains most properties of light
PARTICLE THEORY OF LPhotoelectric Effect Photons of light produce fr
2000 Microsoft Clip
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