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Plane wave

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A true plane wave cannot physically exist, because it would have to fill all space. Nevertheless, the plane wave model is important and widely used in physics. The waves emitted by any source with finite extent into a large homogeneous region of space can be well approximated by plane waves when
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viewed over any part of that region that is sufficiently small compared to its distance from the source. That is the case, for example, of the
37:: a physical quantity whose value, at any moment, is constant through any plane that is perpendicular to a fixed direction in space. 1228:
is a field whose value can be expressed as the product of two functions, one depending only on position, the other only on time. A
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or not, applied to a plane wave yields a plane wave. Any linear combination of plane waves with the same normal vector
2211:{\displaystyle \nabla \cdot {\vec {F}}({\vec {x}},t)\;=\;{\vec {n}}\cdot \partial _{1}G({\vec {x}}\cdot {\vec {n}},t)} 441: 2402: 2368: 2389: 1351: 753: 279: 2384: 2221: 1711: 2437: 1543: 1464: 1969: 831: 2432: 2322: 1133:{\displaystyle F({\vec {x}},t)=A\sin \left(2\pi f({\vec {x}}\cdot {\vec {n}}-ct)+\varphi \right)} 966:; and the value of the field is then the same, and constant in time, at every one of its points. 274: 2262: 2061: 1826: 1790: 1682: 1645: 920: 858: 803: 474: 387: 358: 329: 184: 43: 1500:
is bounded in the time interval of interest (which is usually the case in physical contexts),
1187: 1959:{\displaystyle \nabla F({\vec {x}},t)={\vec {n}}\partial _{1}G({\vec {x}}\cdot {\vec {n}},t)} 1679:
A plane wave can be studied by ignoring the directions perpendicular to the direction vector
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along the direction perpendicular to the wavefronts. Such a field can be written as
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may be scalars, vectors, or any other physical or mathematical quantity. They can be
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This representation is not unique, since the same field values are obtained if
540: 30: 2426: 2327: 1225: 653:{\displaystyle F({\vec {x}},t)=G\left({\vec {x}}\cdot {\vec {n}}-ct\right)\,} 980:
The term is also used, even more specifically, to mean a "monochromatic" or
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of a vector-valued plane wave depends only on the projection of the vector
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is a function that gives the field's value as dependent on only two
1820: 1321:{\displaystyle F({\vec {x}},t)=G({\vec {x}}\cdot {\vec {n}})\,S(t)} 526: 22: 384:. The displacement is constant over each plane perpendicular to 174:{\displaystyle F({\vec {x}},t)=G({\vec {x}}\cdot {\vec {n}},t),} 1635:{\displaystyle \left|G({\vec {x}}\cdot {\vec {n}})\right|} 917:". This plane travels along the direction of propagation 1819:
For a scalar plane wave in two or three dimensions, the
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is a function of one scalar parameter (the displacement
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will be the maximum field magnitude seen at the point
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Often the term "plane wave" refers specifically to a
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if they are always orthogonal (perpendicular) to it.
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if the vectors are always collinear with the vector
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of the field is always collinear with the direction
1160:, which may be a scalar or a vector, is called the 2300: 2280: 2251: 2218:In particular, a transverse planar wave satisfies 2210: 2079: 2050: 2008: 1988: 1958: 1844: 1808: 1768: 1700: 1663: 1634: 1571: 1532: 1512: 1492: 1453: 1433: 1410: 1390: 1340: 1320: 1196: 1176: 1152: 1132: 1005: 958: 938: 905: 876: 847: 821: 792: 742: 716: 681: 652: 555: 492: 459: 428: 405: 376: 347: 318: 265: 241: 202: 173: 81: 61: 2424: 1216:from a distant star that arrive at a telescope. 89:, the value of such a field can be written as 689:is now a function of a single real parameter 2351: 1391:{\displaystyle d={\vec {x}}\cdot {\vec {n}}} 793:{\displaystyle d={\vec {x}}\cdot {\vec {n}}} 319:{\displaystyle d={\vec {x}}\cdot {\vec {n}}} 1540:can be scaled so that the maximum value of 1184:is its "spatial frequency"; and the scalar 2140: 2136: 2252:{\displaystyle \nabla \cdot {\vec {F}}=0} 1305: 649: 1776:as a wave in a one-dimensional medium. 984:: a travelling plane wave whose profile 969: 516: 18:Type of wave propagating in 3 dimensions 2383: 1769:{\displaystyle G(z,t)=F(z{\vec {n}},t)} 1708:; that is, by considering the function 512: 2425: 1219: 467:are vectors, the wave is said to be a 2016:with respect to the first argument. 1461:are scaled by reciprocal factors. If 1232:, in particular, can be expressed as 1398:) with scalar or vector values, and 1164:of the wave; the scalar coefficient 855:, the moving plane perpendicular to 13: 2225: 2157: 2094: 1974: 1905: 1859: 14: 2449: 1572:{\displaystyle \left|S(t)\right|} 1493:{\displaystyle \left|S(t)\right|} 1418:is a scalar function of time. 507: 2377: 2345: 2272: 2237: 2205: 2193: 2178: 2169: 2147: 2133: 2121: 2112: 2106: 2071: 2045: 2033: 1989:{\displaystyle \partial _{1}G} 1953: 1941: 1926: 1917: 1898: 1886: 1874: 1865: 1836: 1800: 1763: 1751: 1739: 1730: 1718: 1692: 1655: 1624: 1618: 1603: 1594: 1561: 1555: 1482: 1476: 1382: 1367: 1315: 1309: 1302: 1296: 1281: 1272: 1263: 1251: 1242: 1116: 1101: 1086: 1077: 1048: 1036: 1027: 1000: 994: 930: 913:from the origin is called a " 868: 813: 784: 769: 676: 670: 629: 614: 594: 582: 573: 484: 442:complex exponential plane wave 397: 368: 339: 310: 295: 236: 224: 194: 165: 153: 138: 129: 120: 108: 99: 53: 1: 2338: 1996:is the partial derivative of 1674: 525:of a plane wave traveling in 7: 2311: 10: 2454: 2281:{\displaystyle {\vec {x}}} 2080:{\displaystyle {\vec {n}}} 1845:{\displaystyle {\vec {n}}} 1809:{\displaystyle {\vec {n}}} 1701:{\displaystyle {\vec {n}}} 1664:{\displaystyle {\vec {x}}} 973: 939:{\displaystyle {\vec {n}}} 877:{\displaystyle {\vec {n}}} 822:{\displaystyle {\vec {n}}} 493:{\displaystyle {\vec {n}}} 406:{\displaystyle {\vec {n}}} 377:{\displaystyle {\vec {n}}} 348:{\displaystyle {\vec {x}}} 203:{\displaystyle {\vec {n}}} 62:{\displaystyle {\vec {x}}} 2390:Classical Electrodynamics 2393:(3 ed.). New York: 2359:(2 ed.). New York: 1197:{\displaystyle \varphi } 835:. For each displacement 832:direction of propagation 750:, for each displacement 416:The values of the field 273:, and the scalar-valued 2323:Rectilinear propagation 29:is a special case of a 2357:Waves in Layered Media 2302: 2282: 2253: 2212: 2081: 2052: 2051:{\displaystyle G(d,t)} 2010: 1990: 1960: 1846: 1816:is also a plane wave. 1810: 1770: 1702: 1665: 1636: 1573: 1534: 1514: 1494: 1455: 1435: 1412: 1392: 1342: 1322: 1198: 1178: 1154: 1134: 1007: 960: 940: 907: 878: 849: 823: 794: 744: 718: 717:{\displaystyle u=d-ct} 683: 654: 557: 529: 494: 461: 430: 407: 378: 349: 320: 267: 243: 242:{\displaystyle G(d,t)} 204: 175: 83: 69:in space and any time 63: 2303: 2283: 2254: 2213: 2082: 2053: 2011: 1991: 1961: 1847: 1811: 1771: 1703: 1666: 1637: 1574: 1535: 1515: 1495: 1456: 1436: 1413: 1393: 1343: 1323: 1199: 1179: 1155: 1135: 1008: 982:sinusoidal plane wave 976:Sinusoidal plane wave 970:Sinusoidal plane wave 961: 941: 908: 879: 850: 824: 795: 745: 719: 684: 655: 558: 520: 495: 462: 431: 408: 379: 350: 321: 268: 253:parameters: the time 244: 205: 176: 84: 64: 2318:Plane-wave expansion 2292: 2263: 2222: 2091: 2062: 2027: 2000: 1970: 1856: 1827: 1791: 1712: 1683: 1646: 1583: 1544: 1524: 1504: 1465: 1445: 1425: 1402: 1352: 1332: 1236: 1188: 1168: 1144: 1021: 1017:function. That is, 1006:{\displaystyle G(u)} 988: 950: 921: 906:{\displaystyle d+ct} 888: 859: 839: 804: 754: 728: 693: 682:{\displaystyle G(u)} 664: 567: 547: 535:traveling plane wave 513:Traveling plane wave 475: 451: 420: 388: 359: 355:along the direction 330: 280: 257: 218: 185: 93: 73: 44: 2385:Jackson, John David 1230:plane standing wave 1220:Plane standing wave 743:{\displaystyle t=0} 447:When the values of 2298: 2278: 2249: 2208: 2077: 2048: 2006: 1986: 1956: 1842: 1806: 1766: 1698: 1661: 1632: 1569: 1530: 1510: 1490: 1451: 1431: 1408: 1388: 1338: 1318: 1194: 1174: 1150: 1130: 1003: 956: 936: 903: 874: 845: 819: 790: 740: 714: 679: 650: 553: 530: 490: 457: 426: 403: 374: 345: 316: 263: 239: 212:unit-length vector 200: 171: 79: 59: 2438:Planes (geometry) 2301:{\displaystyle t} 2275: 2240: 2196: 2181: 2150: 2124: 2109: 2074: 2058:in the direction 2009:{\displaystyle G} 1944: 1929: 1901: 1877: 1839: 1803: 1754: 1695: 1658: 1621: 1606: 1533:{\displaystyle G} 1513:{\displaystyle S} 1454:{\displaystyle G} 1434:{\displaystyle S} 1411:{\displaystyle S} 1385: 1370: 1341:{\displaystyle G} 1299: 1284: 1254: 1177:{\displaystyle f} 1153:{\displaystyle A} 1104: 1089: 1039: 959:{\displaystyle c} 933: 871: 848:{\displaystyle d} 816: 800:. In that case, 787: 772: 632: 617: 585: 556:{\displaystyle c} 487: 469:longitudinal wave 460:{\displaystyle F} 429:{\displaystyle F} 400: 371: 342: 313: 298: 266:{\displaystyle t} 197: 156: 141: 111: 82:{\displaystyle t} 56: 40:For any position 2445: 2409: 2408: 2381: 2375: 2374: 2363:. pp. 1–3. 2353:Brekhovskikh, L. 2349: 2307: 2305: 2304: 2299: 2287: 2285: 2284: 2279: 2277: 2276: 2268: 2258: 2256: 2255: 2250: 2242: 2241: 2233: 2217: 2215: 2214: 2209: 2198: 2197: 2189: 2183: 2182: 2174: 2165: 2164: 2152: 2151: 2143: 2126: 2125: 2117: 2111: 2110: 2102: 2087:. 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968: 955: 946:with velocity 932: 929: 902: 899: 896: 893: 870: 867: 844: 829:is called the 815: 812: 786: 783: 777: 771: 768: 762: 759: 739: 736: 733: 713: 710: 707: 704: 701: 698: 678: 675: 672: 669: 647: 643: 640: 637: 631: 628: 622: 616: 613: 606: 602: 599: 596: 593: 590: 584: 581: 575: 572: 552: 514: 511: 509: 506: 486: 483: 456: 425: 399: 396: 370: 367: 341: 338: 312: 309: 303: 297: 294: 288: 285: 262: 238: 235: 232: 229: 226: 223: 196: 193: 170: 167: 164: 161: 155: 152: 146: 140: 137: 131: 128: 125: 122: 119: 116: 110: 107: 101: 98: 78: 55: 52: 17: 9: 6: 4: 3: 2: 2450: 2439: 2436: 2434: 2431: 2430: 2428: 2418: 2416: 2415: 2406: 2404:9780471309321 2400: 2396: 2392: 2391: 2386: 2380: 2372: 2370:9780323161626 2366: 2362: 2358: 2354: 2348: 2344: 2334: 2331: 2329: 2328:Wave equation 2326: 2324: 2321: 2319: 2316: 2315: 2309: 2295: 2269: 2246: 2243: 2234: 2228: 2202: 2199: 2190: 2184: 2175: 2166: 2161: 2153: 2144: 2137: 2130: 2127: 2118: 2103: 2097: 2068: 2042: 2039: 2036: 2030: 2022: 2017: 2003: 1983: 1978: 1950: 1947: 1938: 1932: 1923: 1914: 1909: 1895: 1889: 1883: 1880: 1871: 1862: 1833: 1822: 1817: 1797: 1786: 1782: 1777: 1760: 1757: 1748: 1742: 1736: 1733: 1727: 1724: 1721: 1715: 1689: 1672: 1652: 1628: 1615: 1609: 1600: 1591: 1587: 1565: 1558: 1552: 1548: 1527: 1507: 1486: 1479: 1473: 1469: 1448: 1428: 1419: 1405: 1379: 1373: 1364: 1358: 1355: 1335: 1312: 1306: 1293: 1287: 1278: 1269: 1266: 1260: 1257: 1248: 1239: 1231: 1227: 1226:standing wave 1217: 1215: 1209: 1207: 1191: 1171: 1163: 1147: 1126: 1122: 1119: 1113: 1110: 1107: 1098: 1092: 1083: 1074: 1071: 1068: 1064: 1060: 1057: 1054: 1051: 1045: 1042: 1033: 1024: 1016: 997: 991: 983: 977: 967: 953: 927: 916: 900: 897: 894: 891: 865: 842: 834: 833: 810: 781: 775: 766: 760: 757: 737: 734: 731: 711: 708: 705: 702: 699: 696: 673: 667: 645: 641: 638: 635: 626: 620: 611: 604: 600: 597: 591: 588: 579: 570: 550: 543: 542: 537: 536: 528: 524: 519: 508:Special types 505: 503: 481: 470: 454: 445: 443: 439: 423: 414: 394: 365: 336: 326:of the point 307: 301: 292: 286: 283: 276: 260: 252: 233: 230: 227: 221: 213: 191: 168: 162: 159: 150: 144: 135: 126: 123: 117: 114: 105: 96: 76: 50: 38: 36: 32: 28: 24: 16: 2388: 2379: 2356: 2347: 2018: 1818: 1778: 1678: 1579:is 1. Then 1420: 1223: 1210: 979: 884:at distance 830: 539: 533: 531: 446: 415: 275:displacement 39: 26: 20: 15: 1214:light waves 1206:phase shift 2427:Categories 2339:References 2021:divergence 1675:Properties 1015:sinusoidal 541:wave speed 523:wavefronts 440:, as in a 27:plane wave 2273:→ 2238:→ 2229:⋅ 2226:∇ 2194:→ 2185:⋅ 2179:→ 2158:∂ 2154:⋅ 2148:→ 2122:→ 2107:→ 2098:⋅ 2095:∇ 2072:→ 1975:∂ 1942:→ 1933:⋅ 1927:→ 1906:∂ 1899:→ 1875:→ 1860:∇ 1837:→ 1801:→ 1752:→ 1693:→ 1656:→ 1619:→ 1610:⋅ 1604:→ 1383:→ 1374:⋅ 1368:→ 1297:→ 1288:⋅ 1282:→ 1252:→ 1192:φ 1162:amplitude 1123:φ 1108:− 1102:→ 1093:⋅ 1087:→ 1072:π 1061:⁡ 1037:→ 931:→ 915:wavefront 869:→ 814:→ 785:→ 776:⋅ 770:→ 706:− 636:− 630:→ 621:⋅ 615:→ 583:→ 485:→ 398:→ 369:→ 340:→ 311:→ 302:⋅ 296:→ 195:→ 154:→ 145:⋅ 139:→ 109:→ 54:→ 2387:(1998). 2355:(1980). 2312:See also 2259:for all 1966:, where 1821:gradient 1204:is its " 500:, and a 527:3-space 23:physics 2401:  2367:  1785:linear 1328:where 660:where 214:, and 181:where 2395:Wiley 1013:is a 210:is a 35:field 2399:ISBN 2365:ISBN 2288:and 2019:The 1779:Any 1520:and 1441:and 521:The 444:. 251:real 31:wave 25:, a 1208:". 1058:sin 33:or 21:In 2429:: 2308:. 1783:, 1671:. 1224:A 413:. 2407:. 2373:. 2296:t 2270:x 2247:0 2244:= 2235:F 2206:) 2203:t 2200:, 2191:n 2176:x 2170:( 2167:G 2162:1 2145:n 2138:= 2134:) 2131:t 2128:, 2119:x 2113:( 2104:F 2069:n 2046:) 2043:t 2040:, 2037:d 2034:( 2031:G 2004:G 1984:G 1979:1 1954:) 1951:t 1948:, 1939:n 1924:x 1918:( 1915:G 1910:1 1896:n 1890:= 1887:) 1884:t 1881:, 1872:x 1866:( 1863:F 1834:n 1798:n 1764:) 1761:t 1758:, 1749:n 1743:z 1740:( 1737:F 1734:= 1731:) 1728:t 1725:, 1722:z 1719:( 1716:G 1690:n 1653:x 1629:| 1625:) 1616:n 1601:x 1595:( 1592:G 1588:| 1566:| 1562:) 1559:t 1556:( 1553:S 1549:| 1528:G 1508:S 1487:| 1483:) 1480:t 1477:( 1474:S 1470:| 1449:G 1429:S 1406:S 1380:n 1365:x 1359:= 1356:d 1336:G 1316:) 1313:t 1310:( 1307:S 1303:) 1294:n 1279:x 1273:( 1270:G 1267:= 1264:) 1261:t 1258:, 1249:x 1243:( 1240:F 1172:f 1148:A 1127:) 1120:+ 1117:) 1114:t 1111:c 1099:n 1084:x 1078:( 1075:f 1069:2 1065:( 1055:A 1052:= 1049:) 1046:t 1043:, 1034:x 1028:( 1025:F 1001:) 998:u 995:( 992:G 954:c 928:n 901:t 898:c 895:+ 892:d 866:n 843:d 811:n 782:n 767:x 761:= 758:d 738:0 735:= 732:t 712:t 709:c 703:d 700:= 697:u 677:) 674:u 671:( 668:G 646:) 642:t 639:c 627:n 612:x 605:( 601:G 598:= 595:) 592:t 589:, 580:x 574:( 571:F 551:c 482:n 455:F 424:F 395:n 366:n 337:x 308:n 293:x 287:= 284:d 261:t 237:) 234:t 231:, 228:d 225:( 222:G 192:n 169:, 166:) 163:t 160:, 151:n 136:x 130:( 127:G 124:= 121:) 118:t 115:, 106:x 100:( 97:F 77:t 51:x

Index

physics
wave
field
unit-length vector
real
displacement
complex numbers
complex exponential plane wave
longitudinal wave
transverse wave

wavefronts
3-space
traveling plane wave
wave speed
direction of propagation
wavefront
Sinusoidal plane wave
sinusoidal plane wave
sinusoidal
amplitude
phase shift
light waves
standing wave
plane standing wave
local operator
linear
gradient
divergence
Plane-wave expansion

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