Physical optics: Difference between revisions
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{{Short description|Branch of optics}} |
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[[File:Laser Interference.JPG|thumb|200px|Physical optics is used to explain effects such as [[diffraction]].]] |
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In [[physics]], '''physical optics''', or '''wave optics''', is the branch of [[optics]] |
[[File:Laser Interference.JPG|thumb|200px|Physical optics is used to explain effects such as [[diffraction]]]] |
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In [[physics]], '''physical optics''', or '''wave optics''', is the branch of [[optics]] that studies [[Interference (wave propagation)|interference]], [[diffraction]], [[Polarization (waves)|polarization]], and other phenomena for which the ray approximation of [[geometric optics]] is not valid. This usage tends not to include effects such as [[quantum noise]] in [[optical communication]], which is studied in the sub-branch of [[coherence theory (optics)|coherence theory]]. |
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== Principle == |
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== The physical optics approximation == |
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''Physical optics'' is also the name of an [[approximation]] commonly used in optics, [[electrical engineering]] and [[applied physics]]. In this context, it is an intermediate method between [[geometric optics]], which ignores [[wave]] effects, and full wave [[electromagnetism]], which is a precise [[theory]]. The word "physical" means that it is more physical than [[geometric]] or [[ray (optics)|ray]] optics and not that it is an exact physical theory.<ref name="Ufimtsev2007">{{cite book|author=Pyotr Ya. Ufimtsev|title=Fundamentals of the Physical Theory of Diffraction|date=9 February 2007|publisher=John Wiley & Sons|isbn=978-0-470-10900-7}}</ref>{{rp|11–13}} |
''Physical optics'' is also the name of an [[approximation]] commonly used in optics, [[electrical engineering]] and [[applied physics]]. In this context, it is an intermediate method between [[geometric optics]], which ignores [[wave]] effects, and full wave [[electromagnetism]], which is a precise [[theory]]. The word "physical" means that it is more physical than [[geometric]] or [[ray (optics)|ray]] optics and not that it is an exact physical theory.<ref name="Ufimtsev2007">{{cite book|author=Pyotr Ya. Ufimtsev|title=Fundamentals of the Physical Theory of Diffraction|date=9 February 2007|publisher=John Wiley & Sons|isbn=978-0-470-10900-7}}</ref>{{rp|11–13}} |
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This approximation consists of using ray optics to estimate the field on a surface and then [[integral|integrating]] that field over the surface to calculate the transmitted or scattered field. This resembles the [[Born approximation]], in that the details of the problem are treated as a [[perturbation theory|perturbation]]. |
This approximation consists of using ray optics to estimate the field on a surface and then [[integral|integrating]] that field over the surface to calculate the transmitted or scattered field. This resembles the [[Born approximation]], in that the details of the problem are treated as a [[perturbation theory|perturbation]]. |
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In optics, it is a standard way of estimating diffraction effects. In [[radio]], this approximation is used to estimate some effects that resemble optical effects. It models several interference, diffraction and polarization effects but not the dependence of diffraction on polarization. Since |
In optics, it is a standard way of estimating diffraction effects. In [[radio]], this approximation is used to estimate some effects that resemble optical effects. It models several interference, diffraction and polarization effects but not the dependence of diffraction on polarization. Since this is a high-frequency approximation, it is often more accurate in optics than for radio. |
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In optics, it typically consists of integrating ray |
In optics, it typically consists of integrating ray-estimated field over a lens, mirror or aperture to calculate the transmitted or scattered field. |
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In [[radar]] [[scattering]] it usually means taking the [[current (electricity)|current]] that would be found on a [[tangent]] [[Plane (mathematics)|plane]] of similar material as the current at each point on the front, i. e. the geometrically illuminated part, of a [[scattering|scatterer]]. Current on the shadowed parts is taken as zero. The approximate scattered field is then obtained by an integral over these approximate currents. This is useful for bodies with large smooth [[wikt:convex|convex]] shapes and for lossy (low |
In [[radar]] [[scattering]] it usually means taking the [[current (electricity)|current]] that would be found on a [[tangent]] [[Plane (mathematics)|plane]] of similar material as the current at each point on the front, i. e. the geometrically illuminated part, of a [[scattering|scatterer]]. Current on the shadowed parts is taken as zero. The approximate scattered field is then obtained by an integral over these approximate currents. This is useful for bodies with large smooth [[wikt:convex|convex]] shapes and for lossy (low-reflection) surfaces. |
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The ray |
The ray-optics field or current is generally not accurate near edges or shadow boundaries, unless supplemented by diffraction and [[creeping wave]] calculations. |
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The standard theory of physical optics has some defects in the evaluation of scattered fields, leading to decreased accuracy away from the specular direction.<ref name=Umul>{{cite journal |title=Modified theory of physical optics |first=Y. Z. |last=Umul |journal=Optics Express |date=October 2004 |volume=12 |issue=20 |pages=4959–4972 |doi=10.1364/OPEX.12.004959 |pmid=19484050|bibcode = 2004OExpr..12.4959U }}</ref><ref>{{cite journal |last1=Shijo |first1=T. |last2=Rodriguez |first2=L. |last3=Ando |first3=M. |title=The modified surface-normal vectors in the physical optics |journal=IEEE Transactions on Antennas and Propagation |volume=56 |issue=12 |pages=3714–3722 |date=Dec 2008 |doi=10.1109/TAP.2008.2007276|bibcode = 2008ITAP...56.3714S }}</ref> An improved theory introduced in 2004 gives exact solutions to problems involving wave diffraction by conducting scatterers.<ref name=Umul/> |
The standard theory of physical optics has some defects in the evaluation of scattered fields, leading to decreased accuracy away from the specular direction.<ref name=Umul>{{cite journal |title=Modified theory of physical optics |first=Y. Z. |last=Umul |journal=Optics Express |date=October 2004 |volume=12 |issue=20 |pages=4959–4972 |doi=10.1364/OPEX.12.004959 |pmid=19484050|bibcode = 2004OExpr..12.4959U |doi-access=free }}</ref><ref>{{cite journal |last1=Shijo |first1=T. |last2=Rodriguez |first2=L. |last3=Ando |first3=M. |title=The modified surface-normal vectors in the physical optics |journal=IEEE Transactions on Antennas and Propagation |volume=56 |issue=12 |pages=3714–3722 |date=Dec 2008 |doi=10.1109/TAP.2008.2007276|bibcode = 2008ITAP...56.3714S |s2cid=41440656 }}</ref> An improved theory introduced in 2004 gives exact solutions to problems involving wave diffraction by conducting scatterers.<ref name=Umul/> |
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==See also== |
==See also== |
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*[[Optical physics]] |
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*[[Electromagnetic modeling]] |
*[[Electromagnetic modeling]] |
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*[[Fourier optics]] |
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*[[History of optics]] |
*[[History of optics]] |
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*[[Negative |
*[[Negative-index metamaterials]] |
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== References == |
== References == |
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*{{cite book |author1=Serway, Raymond A. |author2=Jewett, John W. | title=Physics for Scientists and Engineers (6th ed.) | publisher=Brooks/Cole | year=2004 | isbn=0-534-40842-7}} |
*{{cite book | author1=Serway, Raymond A. | author2=Jewett, John W. | title=Physics for Scientists and Engineers (6th ed.) | publisher=Brooks/Cole | year=2004 | isbn=0-534-40842-7 | url-access=registration | url=https://archive.org/details/physicssciengv2p00serw }} |
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*{{cite book |author1=Akhmanov, A |author2=Nikitin, S. Yu | title=Physical Optics |publisher= Oxford University Press |year=1997| isbn=0-19-851795-5}} |
*{{cite book |author1=Akhmanov, A |author2=Nikitin, S. Yu | title=Physical Optics |publisher= Oxford University Press |year=1997| isbn=0-19-851795-5}} |
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*{{cite journal |title=A double-edge-diffraction Gaussian-series method for efficient physical optics analysis of dual-shaped-reflector antennas |journal=IEEE Transactions on Antennas and Propagation |date=August 2005 |page=2597}} |
*{{cite journal |title=A double-edge-diffraction Gaussian-series method for efficient physical optics analysis of dual-shaped-reflector antennas |journal=IEEE Transactions on Antennas and Propagation |date=August 2005 |page=2597 |doi=10.1109/tap.2005.851855 |volume=53 | last1 = Hay | first1 = S.G.|issue=8 |bibcode=2005ITAP...53.2597H |s2cid=10050665 }} |
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*{{cite journal |title=The physical optics method in electromagnetic scattering |first=J. S. |last=Asvestas |journal=Journal of Mathematical Physics |date=February 1980 |volume=21 |issue=2 |pages=290–299 |doi=10.1063/1.524413|bibcode = 1980JMP....21..290A }} |
*{{cite journal |title=The physical optics method in electromagnetic scattering |first=J. S. |last=Asvestas |journal=Journal of Mathematical Physics |date=February 1980 |volume=21 |issue=2 |pages=290–299 |doi=10.1063/1.524413|bibcode = 1980JMP....21..290A }} |
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<references/> |
<references/> |
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==External links== |
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*{{Commons category-inline|Physical optics}} |
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{{Authority control}} |
{{Authority control}} |
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[[Category:Physical optics| ]] |
[[Category:Physical optics| ]] |
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[[Category:Electrical engineering]] |
[[Category:Electrical engineering]] |
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Latest revision as of 10:50, 30 April 2024
In physics, physical optics, or wave optics, is the branch of optics that studies interference, diffraction, polarization, and other phenomena for which the ray approximation of geometric optics is not valid. This usage tends not to include effects such as quantum noise in optical communication, which is studied in the sub-branch of coherence theory.
Principle
[edit]Physical optics is also the name of an approximation commonly used in optics, electrical engineering and applied physics. In this context, it is an intermediate method between geometric optics, which ignores wave effects, and full wave electromagnetism, which is a precise theory. The word "physical" means that it is more physical than geometric or ray optics and not that it is an exact physical theory.[1]: 11–13
This approximation consists of using ray optics to estimate the field on a surface and then integrating that field over the surface to calculate the transmitted or scattered field. This resembles the Born approximation, in that the details of the problem are treated as a perturbation.
In optics, it is a standard way of estimating diffraction effects. In radio, this approximation is used to estimate some effects that resemble optical effects. It models several interference, diffraction and polarization effects but not the dependence of diffraction on polarization. Since this is a high-frequency approximation, it is often more accurate in optics than for radio.
In optics, it typically consists of integrating ray-estimated field over a lens, mirror or aperture to calculate the transmitted or scattered field.
In radar scattering it usually means taking the current that would be found on a tangent plane of similar material as the current at each point on the front, i. e. the geometrically illuminated part, of a scatterer. Current on the shadowed parts is taken as zero. The approximate scattered field is then obtained by an integral over these approximate currents. This is useful for bodies with large smooth convex shapes and for lossy (low-reflection) surfaces.
The ray-optics field or current is generally not accurate near edges or shadow boundaries, unless supplemented by diffraction and creeping wave calculations.
The standard theory of physical optics has some defects in the evaluation of scattered fields, leading to decreased accuracy away from the specular direction.[2][3] An improved theory introduced in 2004 gives exact solutions to problems involving wave diffraction by conducting scatterers.[2]
See also
[edit]- Optical physics
- Electromagnetic modeling
- Fourier optics
- History of optics
- Negative-index metamaterials
References
[edit]- Serway, Raymond A.; Jewett, John W. (2004). Physics for Scientists and Engineers (6th ed.). Brooks/Cole. ISBN 0-534-40842-7.
- Akhmanov, A; Nikitin, S. Yu (1997). Physical Optics. Oxford University Press. ISBN 0-19-851795-5.
- Hay, S.G. (August 2005). "A double-edge-diffraction Gaussian-series method for efficient physical optics analysis of dual-shaped-reflector antennas". IEEE Transactions on Antennas and Propagation. 53 (8): 2597. Bibcode:2005ITAP...53.2597H. doi:10.1109/tap.2005.851855. S2CID 10050665.
- Asvestas, J. S. (February 1980). "The physical optics method in electromagnetic scattering". Journal of Mathematical Physics. 21 (2): 290–299. Bibcode:1980JMP....21..290A. doi:10.1063/1.524413.
- ^ Pyotr Ya. Ufimtsev (9 February 2007). Fundamentals of the Physical Theory of Diffraction. John Wiley & Sons. ISBN 978-0-470-10900-7.
- ^ a b Umul, Y. Z. (October 2004). "Modified theory of physical optics". Optics Express. 12 (20): 4959–4972. Bibcode:2004OExpr..12.4959U. doi:10.1364/OPEX.12.004959. PMID 19484050.
- ^ Shijo, T.; Rodriguez, L.; Ando, M. (Dec 2008). "The modified surface-normal vectors in the physical optics". IEEE Transactions on Antennas and Propagation. 56 (12): 3714–3722. Bibcode:2008ITAP...56.3714S. doi:10.1109/TAP.2008.2007276. S2CID 41440656.
External links
[edit]
Media related to Physical optics at Wikimedia Commons
