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Slow light

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515:"Slow Light" (2022) is a short film made by Kijek/Adamski with two animation techniques. It's a story of a boy who is born blind and suddenly at the age of seven sees a light. A medical examination reveals that his eyes are so dense that it takes seven years for the light to reach the retina and hence for the image to reach his consciousness.The consequence of the eye defect translates into the mental immaturity of the man, lack of understanding of the present and belated reflections on long-gone facts. The man is never mature enough for his age and constantly lingers on the past. 100: 454:
the same family of phenomena! Here is the solution. These panes of glass slow down the light at an incredible rate since there need be only a relatively thin sheet to slow it down a hundred years. It takes one hundred years for a ray of light to pass through this slice of matter! It would take one year for it to pass through one hundredth of this depth.
508:, that enable city dwellers, submariners and prisoners to watch "live" countryside scenes. "Slow glass" is a material where the delay light takes in passing through the glass is attributed to photons passing "...through a spiral tunnel coiled outside the radius of capture of each atom in the glass." Shaw later reworked the stories into the novel 396:, the time a pulse is delayed divided by the total time of the pulse. Plasmon induced transparency – an analog of EIT – provides another approach based on the destructive interference between different resonance modes. Recent work has now demonstrated this effect over a broad transparency window across a frequency range greater than 0.40 THz. 453:
These window panes are of a composition through which light is slowed down in the same way as when it passes through water. You know well, Péronne, how one can hear more quickly a sound through, for example, a metal conduit or some other solid than through simple space. Well, Péronne, all this is of
357:(FWM) schemes produce a rapid change in refractive index as a function of optical frequency, i.e., they modify the temporal component of a propagating wave. This is done by using a nonlinear effect to modify the dipole response of a medium to a signal or "probe" field. Dispersion mechanisms such as 314:
Slow light refers to a very low group velocity of light. If the dispersion relation of the refractive index is such that the index changes rapidly over a small range of frequencies, then the group velocity might be very low, thousands or millions of times less than
246:). The behavior of a disturbance of this combined electromagnetic-charge density field (i.e. light) is still determined by Maxwell's equations, but the solutions are complicated because of the intimate link between the medium and the field. 303:. If a light is turned on or off at a specific time or otherwise modulated, then the amplitude of the sinusoidal disturbance is also time-dependent. The time-varying amplitude does not propagate at the phase velocity but rather at the 518:
Valve's FPS title "Half Life 2" features a song by the name of "Slow Light" in the original soundtrack. Many other songs in this soundtrack are also references to physical phenomena such as "Brane Scan" and "Dark
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functions of time. For these types of disturbances Maxwell's equations transform into algebraic equations and are easily solved. These special disturbances propagate through a material at a speed slower than
284:). The index of refraction is not a constant for a given material, but depends on temperature, pressure, and upon the frequency of the (sinusoidal) light wave. This latter leads to an effect called 230:
Light traveling within a medium is not merely a disturbance solely of the electromagnetic field, but rather a disturbance of the field and the positions and velocities of the charged particles (
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that are far more sensitive to frequency shift than conventional interferometers. This property can be used to build better, smaller frequency sensors and compact high resolution spectrometers.
75:, with a group velocity 9.6 kilometers per second. Hau and her colleagues later succeeded in stopping light completely, and developed methods by which it can be stopped and later restarted. 411:
Optical switches which make use of slow light in photonic crystals could produce faster data transmission in fiber optic cables, while having significantly lower power requirements.
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and has given rise to a popular notion that the "speed of light is always the same". However, in many situations light is more than a disturbance in the electromagnetic field.
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J. Scheuer, G. T. Paloczi, J. K. S. Poon and A. Yariv, "Coupled Resonator Optical Waveguides: Towards Slowing and Storing of Light", Opt. Photon. News, Vol. 16 (2005) p. 36.
863: 307:. The group velocity depends not only on the refractive index of the material, but also on the way in which the refractive index changes with frequency (i.e. the 388:(BDP). Most slow light schemes can actually offer an arbitrarily long delay for a given device length (length/delay = signal velocity) at the expense of 727:
Ku, Pei-Cheng; Sedgwick, Forrest; Chang-Hasnain, Connie J.; Palinginis, Phedon; Li, Tao; Wang, Hailin; Chang, Shu-Wei; Chuang, Shun-Lien (2004-10-01).
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which realized much lower group velocities of light. They succeeded in slowing a beam of light to about 17 meters per second. In 2004, researchers at
346: 52: 504:, 1966), and several subsequent stories. The glass, which delays the passage of light by years or decades, is used to construct windows, called 37:. Slow light occurs when a propagating pulse is substantially slowed by the interaction with the medium in which the propagation takes place. 404:
Slowing down light has various potential practical applications in multiple technology fields from broadband internet to quantum computing:
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Slowed light could improve data transmission in optical communications through reducing signal distortion and improving signal quality.
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of light, not the phase velocity. Slow light effects are not due to abnormally large refractive indices, as will be explained below.
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in trapped strontium atoms. Reduction of the speed of light by a factor of 165 was reported in 1995. In 1998, Danish physicist
941:"Systematic design study of an all-optical delay line based on Brillouin scattering enhanced cascade coupled ring resonators" 871: 125: 1196: 389: 64: 362: 378: 374: 86:
that can slow light, fashioned out of fairly standard materials, potentially paving the way toward commercial adoption.
468: 121: 350: 321:, even though the index of refraction is still a typical value (between 1.5 and 3.5 for glasses and semiconductors). 110: 487:
takes place, light travels only a few hundred miles per hour due to Discworld's "embarrassingly strong" magic field.
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Understanding the behavior of light in a material is simplified by limiting the types of disturbances studied to
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There are many mechanisms which can generate slow light, all of which create narrow spectral regions with high
243: 223:. The postulate of the constancy of the speed of light in all inertial reference frames lies at the heart of 47:
were known to be possible as far back as 1880, but could not be realized in a useful manner until 1991, when
385: 365:(CROW), and other micro-resonator structures modify the spatial component (k-vector) of a propagating wave. 1093:
Tsakmakidis, K. L.; Hess, O.; Boardman, A. D. (2007). "Trapped rainbow storage of light in metamaterials".
1052: 894:"Light harvesting in photonic crystals revisited: why do slow photons at the blue edge enhance absorption?" 373:
Slow light can also be achieved by exploiting the dispersion properties of planar waveguides realized with
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Zhu, Zhihua; et al. (2013). "Broadband plasmon induced transparency in terahertz metamaterials".
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is the propagation of an optical pulse or other modulation of an optical carrier at a very low
1589: 1559: 1474: 1417: 1409: 1354: 1315: 1241: 1228:. International Conference on Advanced Materials Behavior and Characterization (ICAMBC 2020). 1169: 1118: 921: 836: 764: 756: 687: 640: 632: 583: 529: 476: 358: 48: 1381: 1466: 1401: 1346: 1335:"Tunable optical delay line based on integrated grating-assisted contradirectional couplers" 1307: 1233: 1161: 1110: 1075: 1025: 973: 913: 828: 748: 679: 622: 575: 354: 271: 183: 1549: 480: 234:) within the material. The motion of the electrons is determined by the field (due to the 1165: 977: 1462: 1397: 1303: 1157: 1106: 1071: 969: 909: 744: 706: 675: 618: 571: 1644: 1500: 659: 438: 422: 304: 261: 238:) but the field is determined by the positions and velocities of the electrons (due to 220: 213:
predict that these disturbances will travel at a specific speed, denoted by the symbol
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When light propagates through a material, it travels slower than the vacuum speed,
1287: 790: 1053:"Observation of slow-light in a metamaterials waveguide at microwave frequencies" 1237: 683: 627: 602: 534: 463: 99: 1470: 1380:
Shi, Zhimin; Boyd, Robert W.; Gauthier, Daniel J.; Dudley, C. C. (2007-04-15).
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Wang, Xu; Zhao, Yuhe; Ding, Yunhong; Xiao, Sanshui; Dong, Jianji (2018-09-01).
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Savo, Salvatore; Lu, Wentao T.; Casse, B. Didier F.; Sridhar, Srinivas (2011).
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Lu, Wentao T.; Savo, Salvatore; Casse, B. Didier F.; Sridhar, Srinivas (2009).
392:. The product of the two is roughly constant. A related figure of merit is the 1382:"Enhancing the spectral sensitivity of interferometers using slow-light media" 812:
Ginsberg, Naomi S.; Garner, Sean R.; Hau, Lene Vestergaard (8 February 2007).
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Lene Vestergaard Hau, S.E. Harris, Zachary Dutton, Cyrus H. Behroozi,
1079: 1029: 1001:"Slow microwave waveguide made of negative permeability metamaterials" 1222:"A review on production of slow light with material characterization" 893: 472:(2002), in which the speed of light is described as a "Sunday crawl". 206: 458:
Subsequent fictional works that address slow light are noted below.
814:"Coherent control of optical information with matter wave dynamics" 658:
Kasapi, A.; Jain, Maneesh; Yin, G. Y.; Harris, S. E. (1995-03-27).
219:. This well-known physical constant is commonly referred to as the 960: 892:
Deparis, Olivier; Mouchet, Sébastien Robert; Su, Bao-Lian (2015).
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Pulse that is substantially slowed to less than the speed of light
660:"Electromagnetically Induced Transparency: Propagation Dynamics" 1197:"Scientists Slowed Down Light by 10,000 Times in an Experiment" 449:, 1933), might be one of the earliest mentions of slow light. 93: 79: 176:. This reduction in speed is quantified by the ratio between 428:
Other potential applications include optical quantum memory.
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A predominant figure of merit of slow light schemes is the
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of the material. Slow light is a dramatic reduction in the
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of the light and is manifested in physical effects such as
603:"Observation of electromagnetically induced transparency" 601:
Boller, K.-J.; Imamoğlu, A.; Harris, S. E. (1991-05-20).
1437:"Quantum memory for photons: Dark-state polaritons" 1520:"The Fantastic Science Fiction of Maurice Renard" 791:"Light Changed to Matter, Then Stopped and Moved" 414:Slow light can also be used to control delays in 182:and the phase velocity. This ratio is called the 311:of refractive index with respect to frequency). 1220:Bhagat, Divyani; Gaikwad, Mahesh (2021-01-01). 451: 1261:"Light touch could boost fibre optic networks" 1435:Fleischhauer, M.; Lukin, M. D. (2002-01-15). 421:In addition, slow light can be used to build 8: 864:"IBM slows light, readies it for networking" 462:The slow light experiments are mentioned in 729:"Slow light in semiconductor quantum wells" 128:. Unsourced material may be challenged and 1452: 1019: 959: 626: 556:"Slow light in various media: a tutorial" 148:Learn how and when to remove this message 1008:Microwave and Optical Technology Letters 490:"Slow glass" is a fictional material in 347:electromagnetically induced transparency 53:electromagnetically induced transparency 546: 418:, permitting more orderly traffic flow. 345:Material dispersion mechanisms such as 299:of the light and the frequency as the 295:of the sinusoidal disturbance as the 270:and the phase velocity is called the 7: 363:coupled resonator optical waveguides 126:adding citations to reliable sources 939:Lee, Myungjun; et al. (2010). 898:Physical Chemistry Chemical Physics 197:given by classical physics is of a 71:first demonstrated slow light in a 1518:Evans, Arthur B. (November 1994). 25: 1619:"IBM's new photonic wave-guide". 1286:Krauss, Thomas F. (August 2008). 705:Cromie, William J. (1999-02-18). 437:The description of "luminite" in 862:Kanellos, Michael (2005-11-02). 709:. The Harvard University Gazette 707:"Physicists Slow Speed of Light" 560:Advances in Optics and Photonics 554:Khurgin, Jacob B. (2010-09-30). 98: 1259:Pollitt, Michael (2008-02-07). 351:coherent population oscillation 51:and collaborators demonstrated 1166:10.1088/0957-4484/24/21/214003 978:10.1088/2040-8978/12/10/104012 1: 1558:. National Geographic Books. 379:double negative metamaterials 375:single negative metamaterials 65:Rowland Institute for Science 1288:"Why do we need slow light?" 1226:Materials Today: Proceedings 1238:10.1016/j.matpr.2020.10.453 1195:Nield, David (2024-02-10). 684:10.1103/PhysRevLett.74.2447 628:10.1103/PhysRevLett.66.2593 469:You Shall Know Our Velocity 40:Group velocities below the 1661: 1616:v.397, p. 594 (1999). 1471:10.1103/PhysRevA.65.022314 291:A human eye perceives the 168:. This is a change in the 59:led a combined team from 1312:10.1038/nphoton.2008.139 530:Group velocities above c 193:The simplest picture of 42:speed of light in vacuum 1524:Science Fiction Studies 1060:Applied Physics Letters 664:Physical Review Letters 607:Physical Review Letters 443:Le maître de la lumière 386:Bandwidth-delay product 361:at red and blue edges, 1585:Other Days, Other Eyes 510:Other Days, Other Eyes 456: 201:or disturbance in the 333:, i.e., peaks in the 203:electromagnetic field 1406:10.1364/OL.32.000915 1351:10.1364/PRJ.6.000880 753:10.1364/OL.29.002291 580:10.1364/AOP.2.000287 369:Waveguide dispersion 264:. The ratio between 122:improve this section 57:Lene Vestergaard Hau 1555:The Colour of Magic 1505:The Master of Light 1463:2002PhRvA..65b2314F 1398:2007OptL...32..915S 1304:2008NaPho...2..448K 1158:2013Nanot..24u4003Z 1115:10.1038/nature06285 1107:2007Natur.450..397T 1072:2011ApPhL..98q1907S 970:2010JOpt...12j4012L 948:Journal of Optics A 910:2015PCCP...1730525D 904:(45): 30525–30532. 833:10.1038/nature05493 745:2004OptL...29.2291K 676:1995PhRvL..74.2447K 619:1991PhRvL..66.2593B 572:2010AdOP....2..287K 496:Light of Other Days 447:The Master of Light 353:(CPO), and various 341:Material dispersion 335:dispersion relation 276:index of refraction 211:Maxwell's equations 1339:Photonics Research 918:10.1039/C5CP04983K 225:special relativity 61:Harvard University 1441:Physical Review A 1101:(7168): 397–401. 1080:10.1063/1.3583521 1030:10.1002/mop.24727 1014:(11): 2705–2709. 827:(7128): 623–626. 739:(19): 2291–2293. 670:(13): 2447–2450. 613:(20): 2593–2596. 359:photonic crystals 278:of the material ( 158: 157: 150: 16:(Redirected from 1652: 1640:Nonlinear optics 1623:, November 2004. 1600: 1599: 1576: 1570: 1569: 1550:Pratchett, Terry 1546: 1540: 1539: 1537: 1535: 1515: 1509: 1508: 1497: 1491: 1490: 1456: 1454:quant-ph/0106066 1432: 1426: 1425: 1377: 1371: 1370: 1330: 1324: 1323: 1292:Nature Photonics 1283: 1277: 1276: 1274: 1273: 1256: 1250: 1249: 1217: 1211: 1210: 1208: 1207: 1192: 1186: 1185: 1141: 1135: 1134: 1090: 1084: 1083: 1057: 1048: 1042: 1041: 1023: 1005: 996: 990: 989: 963: 945: 936: 930: 929: 889: 883: 882: 880: 879: 870:. 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Index

Slow glass
group velocity
speed of light in vacuum
Stephen Harris
electromagnetically induced transparency
Lene Vestergaard Hau
Harvard University
Rowland Institute for Science
UC Berkeley
semiconductor
IBM
microchip

cite
sources
improve this section
adding citations to reliable sources
removed
Learn how and when to remove this message
c
phase velocity
refraction
refractive index
group velocity
light
wave
electromagnetic field
vacuum
Maxwell's equations
speed of light

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