Optical constants

Refractive index of Ta2O5 (Tantalum pentoxide)

Gao et al. 2012: n,k 0.35–1.8 µm

Data
tabulated nk
Range
0.35–1.8 µm
Points
726
State
amorphous
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 0.35–1.8 µm
Refractive index n
2.14622
Extinction coefficient k
4.20000e-06
Permittivity ε1
4.60627
Permittivity ε2
1.80283e-05
Absorption coefficient α
0.898209 cm⁻¹
Penetration depth δ = λ/(2πk)
2.22665e+07 nm
Abbe number Vd
—
Chromatic dispersion dn/dλ
-0.2625 µm⁻¹
Group index ng
2.30047
Group velocity dispersion
— fs²/mm
Dispersion parameter D
— ps/(nm·km)
Photon energy
2.11001 eV

ε = (n + ik)², α = 4πk/λ, ng = n − λ dn/dλ, GVD = λ³/(2πc²) d²n/dλ², D = −(λ/c) d²n/dλ². Group-velocity dispersion is given for formula data only.

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith
import lightsmith as ls

# Ta2O5 (Tantalum pentoxide): Gao et al. 2012: n,k 0.35–1.8 µm
ta2o5 = ls.fetch_refractiveindex("main", "Ta2O5", "Gao", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ta2o5.range_nm)  # (350, 1800) nm
eps = ta2o5.eps([633])  # complex permittivity

Downloads the original record once (pinned to the imported snapshot) and caches it.

Lightsmith is open source (MIT): Mie, T-matrix, BEM, DDA, FDTD, RCWA, TMM, mode solvers and inverse design behind one spec, on CPU or GPU. GitHub.

Comments and conditions

400-nm monolayer deposited on 160-µm BK7 substrate using the ion assistance electronic beam deposition technique.

References

L. Gao, F. Lemarchand, M. Lequime. Exploitation of multiple incidences spectrometric measurements for thin film reverse engineering. Opt. Express 20, 15734-15751 (2012) (Numerical data kindly provided by F. Lemarchand)
  • doi:10.1364/oe.20.015734 Exploitation of multiple incidences spectrometric measurements for thin film reverse engineering, Optics Express (2012)

Cite

Lihong Gao, Fabien Lemarchand and Michel Lequime. Exploitation of multiple incidences spectrometric measurements for thin film reverse engineering. Optics Express, 20, 15734 (2012), doi:10.1364/oe.20.015734; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

726 rows as published
Ta2O5 (Tantalum pentoxide), Gao et al. 2012: n,k 0.35–1.8 µm: n and k versus wavelength
λ (µm)nk
0.352.3170480.000655
0.3522.3133950.000637
0.3542.3098320.000619
0.3562.3063550.000602
0.3582.3029620.000585
0.362.2996490.000569
0.3622.2964140.000553
0.3642.2932550.000538
0.3662.2901690.000523
0.3682.2871530.000509
0.372.2842050.000495
0.3722.2813240.000482
0.3742.2785070.000468
0.3762.2757510.000456
0.3782.2730560.000443
0.382.2704190.000431
0.3822.2678380.000419
0.3842.2653130.000408
0.3862.262840.000397
0.3882.2604190.000386
0.392.2580480.000376
0.3922.2557260.000365
0.3942.2534510.000355
0.3962.2512220.000346
0.3982.2490370.000336
0.42.2468960.000327
0.4022.2447970.000318
0.4042.2427390.000309
0.4062.240720.000301
0.4082.2387410.000292
0.412.2367990.000284
0.4122.2348940.000276
0.4142.2330250.000269
0.4162.231190.000261
0.4182.229390.000254
0.422.2276220.000247
0.4222.2258870.00024
0.4242.2241830.000233
0.4262.222510.000226
0.4282.2208670.00022
0.432.2192520.000214
0.4322.2176660.000207
0.4342.2161080.000201
0.4362.2145770.000196
0.4382.2130720.00019
0.442.2115930.000184
0.4422.2101390.000179
0.4442.2087090.000173
0.4462.2073040.000168
0.4482.2059210.000163
0.452.2045620.000158
0.4522.2032250.000153
0.4542.201910.000149
0.4562.2006160.000144
0.4582.1993430.00014
0.462.1980910.000135
0.4622.1968580.000131
0.4642.1956450.000127
0.4662.1944510.000123
0.4682.1932750.000119
0.472.1921180.000115
0.4722.1909790.000111
0.4742.1898570.000108
0.4762.1887520.000104
0.4782.1876640.0001
0.482.1865920.0001
0.4822.1855379.4e-05
0.4842.1844979e-05
0.4862.1834738.7e-05
0.4882.1824638.4e-05
0.492.1814698.1e-05
0.4922.1804897.8e-05
0.4942.1795237.5e-05
0.4962.1785717.3e-05
0.4982.1776337e-05
0.52.1767086.7e-05
0.5022.1757966.5e-05
0.5042.1748976.2e-05
0.5062.174016e-05
0.5082.1731365.7e-05
0.512.1722745.5e-05
0.5122.1714245.3e-05
0.5142.1705865.1e-05
0.5162.1697594.8e-05
0.5182.1689434.6e-05
0.522.1681384.4e-05
0.5222.1673454.2e-05
0.5242.1665614.1e-05
0.5262.1657883.9e-05
0.5282.1650263.7e-05
0.532.1642733.5e-05
0.5322.163533.3e-05
0.5342.1627973.2e-05
0.5362.1620743e-05
0.5382.161362.9e-05
0.542.1606552.7e-05
0.5422.1599592.6e-05
0.5442.1592722.4e-05
0.5462.1585932.3e-05
0.5482.1579232.2e-05
0.552.1572622.1e-05
0.5522.1566091.9e-05
0.5542.1559641.8e-05
0.5562.1553271.7e-05
0.5582.1546971.6e-05
0.562.1540761.5e-05
0.5622.1534621.4e-05
0.5642.1528561.3e-05
0.5662.1522561.2e-05
0.5682.1516651.1e-05
0.572.151081e-05
0.5722.1505029e-06
0.5742.1499319e-06
0.5762.1493678e-06
0.5782.1488097e-06
0.582.1482587e-06
0.5822.1477146e-06
0.5842.1471755e-06
0.5862.1466435e-06
0.5882.1461184e-06
0.592.1455984e-06
0.5922.1450843e-06
0.5942.1445763e-06
0.5962.1440743e-06
0.5982.1435772e-06
0.62.1430862e-06
0.6022.1426011e-06
0.6042.1421211e-06
0.6062.1416461e-06
0.6082.1411771e-06
0.612.1407121e-06
0.6122.1402530.0
0.6142.1397990.0
0.6162.139350.0
0.6182.1389060.0
0.622.1384660.0
0.6222.1380320.0
0.6242.1376020.0
0.6262.1371760.0
0.6282.1367550.0
0.632.1363390.0
0.6322.1359270.0
0.6342.135520.0
0.6362.1351160.0
0.6382.1347170.0
0.642.1343220.0
0.6422.1339310.0
0.6442.1335450.0
0.6462.1331620.0
0.6482.1327830.0
0.652.1324080.0
0.6522.1320370.0
0.6542.1316690.0
0.6562.1313060.0
0.6582.1309460.0
0.662.1305890.0
0.6622.1302360.0
0.6642.1298870.0
0.6662.1295410.0
0.6682.1291990.0
0.672.128860.0
0.6722.1285240.0
0.6742.1281910.0
0.6762.1278620.0
0.6782.1275360.0
0.682.1272130.0
0.6822.1268930.0
0.6842.1265770.0
0.6862.1262630.0
0.6882.1259520.0
0.692.1256450.0
0.6922.125340.0
0.6942.1250380.0
0.6962.1247390.0
0.6982.1244430.0
0.72.1241490.0
0.7022.1238580.0
0.7042.123570.0
0.7062.1232850.0
0.7082.1230020.0
0.712.1227220.0
0.7122.1224440.0
0.7142.1221690.0
0.7162.1218970.0
0.7182.1216260.0
0.722.1213590.0
0.7222.1210930.0
0.7242.1208310.0
0.7262.120570.0
0.7282.1203120.0
0.732.1200560.0
0.7322.1198020.0
0.7342.1195510.0
0.7362.1193020.0
0.7382.1190550.0
0.742.118810.0
0.7422.1185670.0
0.7442.1183270.0
0.7462.1180880.0
0.7482.1178520.0
0.752.1176170.0
0.7522.1173850.0
0.7542.1171550.0
0.7562.1169260.0
0.7582.11670.0
0.762.1164750.0
0.7622.1162530.0
0.7642.1160320.0
0.7662.1158130.0
0.7682.1155960.0
0.772.1153810.0
0.7722.1151670.0
0.7742.1149550.0
0.7762.1147460.0
0.7782.1145370.0
0.782.1143310.0
0.7822.1141260.0
0.7842.1139230.0
0.7862.1137220.0
0.7882.1135220.0
0.792.1133240.0
0.7922.1131270.0
0.7942.1129320.0
0.7962.1127390.0
0.7982.1125470.0
0.82.1123560.0
0.8022.1121680.0
0.8042.111980.0
0.8062.1117940.0
0.8082.111610.0
0.812.1114270.0
0.8122.1112460.0
0.8142.1110660.0
0.8162.1108870.0
0.8182.110710.0
0.822.1105340.0
0.8222.1103590.0
0.8242.1101860.0
0.8262.1100150.0
0.8282.1098440.0
0.832.1096750.0
0.8322.1095070.0
0.8342.109340.0
0.8362.1091750.0
0.8382.1090110.0
0.842.1088480.0
0.8422.1086870.0
0.8442.1085260.0
0.8462.1083670.0
0.8482.1082090.0
0.852.1080520.0
0.8522.1078970.0
0.8542.1077420.0
0.8562.1075890.0
0.8582.1074370.0
0.862.1072860.0
0.8622.1071360.0
0.8642.1069870.0
0.8662.1068390.0
0.8682.1066920.0
0.872.1065470.0
0.8722.1064020.0
0.8742.1062590.0
0.8762.1061160.0
0.8782.1059750.0
0.882.1058340.0
0.8822.1056950.0
0.8842.1055570.0
0.8862.1054190.0
0.8882.1052830.0
0.892.1051470.0
0.8922.1050130.0
0.8942.1048790.0
0.8962.1047470.0
0.8982.1046150.0
0.92.1044840.0
0.9022.1043540.0
0.9042.1042250.0
0.9062.1040970.0
0.9082.103970.0
0.912.1038440.0
0.9122.1037180.0
0.9142.1035940.0
0.9162.103470.0
0.9182.1033470.0
0.922.1032250.0
0.9222.1031040.0
0.9242.1029840.0
0.9262.1028640.0
0.9282.1027460.0
0.932.1026280.0
0.9322.1025110.0
0.9342.1023940.0
0.9362.1022790.0
0.9382.1021640.0
0.942.102050.0
0.9422.1019370.0
0.9442.1018240.0
0.9462.1017130.0
0.9482.1016020.0
0.952.1014910.0
0.9522.1013820.0
0.9542.1012730.0
0.9562.1011650.0
0.9582.1010570.0
0.962.1009510.0
0.9622.1008450.0
0.9642.1007390.0
0.9662.1006350.0
0.9682.1005310.0
0.972.1004280.0
0.9722.1003250.0
0.9742.1002230.0
0.9762.1001220.0
0.9782.1000210.0
0.982.0999210.0
0.9822.0998220.0
0.9842.0997230.0
0.9862.0996250.0
0.9882.0995280.0
0.992.0994310.0
0.9922.0993340.0
0.9942.0992390.0
0.9962.0991440.0
0.9982.0990490.0
1.02.0989550.0
1.0022.0988620.0
1.0042.0987690.0
1.0062.0986770.0
1.0082.0985860.0
1.012.0984950.0
1.0122.0984040.0
1.0142.0983150.0
1.0162.0982250.0
1.0182.0981360.0
1.022.0980480.0
1.0222.0979610.0
1.0242.0978730.0
1.0262.0977870.0
1.0282.0977010.0
1.032.0976150.0
1.0322.097530.0
1.0342.0974460.0
1.0362.0973620.0
1.0382.0972780.0
1.042.0971950.0
1.0422.0971120.0
1.0442.097030.0
1.0462.0969490.0
1.0482.0968680.0
1.052.0967870.0
1.0522.0967070.0
1.0542.0966270.0
1.0562.0965480.0
1.0582.096470.0
1.062.0963910.0
1.0622.0963140.0
1.0642.0962360.0
1.0662.0961590.0
1.0682.0960830.0
1.072.0960070.0
1.0722.0959310.0
1.0742.0958560.0
1.0762.0957820.0
1.0782.0957070.0
1.082.0956340.0
1.0822.095560.0
1.0842.0954870.0
1.0862.0954150.0
1.0882.0953430.0
1.092.0952710.0
1.0922.09520.0
1.0942.0951290.0
1.0962.0950580.0
1.0982.0949880.0
1.12.0949180.0
1.1022.0948490.0
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1.1062.0947120.0
1.1082.0946430.0
1.112.0945760.0
1.1122.0945080.0
1.1142.0944410.0
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1.1182.0943080.0
1.122.0942420.0
1.1222.0941770.0
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1.1282.0939820.0
1.132.0939180.0
1.1322.0938540.0
1.1342.0937910.0
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1.142.0936030.0
1.1422.0935410.0
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1.1482.0933560.0
1.152.0932960.0
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1.162.0929970.0
1.1622.0929380.0
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1.1682.0927640.0
1.172.0927060.0
1.1722.0926490.0
1.1742.0925920.0
1.1762.0925350.0
1.1782.0924790.0
1.182.0924230.0
1.1822.0923670.0
1.1842.0923110.0
1.1862.0922560.0
1.1882.0922010.0
1.192.0921470.0
1.1922.0920920.0
1.1942.0920380.0
1.1962.0919840.0
1.1982.0919310.0
1.22.0918780.0
1.2022.0918250.0
1.2042.0917720.0
1.2062.091720.0
1.2082.0916680.0
1.212.0916160.0
1.2122.0915640.0
1.2142.0915130.0
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1.222.091360.0
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1.2322.0910620.0
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1.242.0908680.0
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1.252.0906310.0
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1.262.09040.0
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1.5482.0855770.0
1.552.0855520.0
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1.562.0854320.0
1.5622.0854090.0
1.5642.0853850.0
1.5662.0853620.0
1.5682.0853380.0
1.572.0853150.0
1.5722.0852920.0
1.5742.0852680.0
1.5762.0852450.0
1.5782.0852220.0
1.582.08520.0
1.5822.0851770.0
1.5842.0851540.0
1.5862.0851310.0
1.5882.0851090.0
1.592.0850870.0
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1.62.0849760.0
1.6022.0849540.0
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1.6082.0848880.0
1.612.0848670.0
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1.622.084760.0
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1.632.0846550.0
1.6322.0846340.0
1.6342.0846140.0
1.6362.0845930.0
1.6382.0845730.0
1.642.0845520.0
1.6422.0845320.0
1.6442.0845120.0
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1.652.0844510.0
1.6522.0844310.0
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1.662.0843520.0
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1.692.0840660.0
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1.7062.0839190.0
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1.792.0832130.0
1.7922.0831980.0
1.7942.0831820.0
1.7962.0831670.0
1.7982.0831510.0
1.82.0831360.0

Optical transmission calculator

Free-standing sample in vacuum, normal incidence
Method
Transmittance T
—
Reflectance R
—

Fresnel reflection calculator

Direction
Rp
—
Rs
—
R = (Rp+Rs)/2
—
Phase φp
—
Phase φs
—
Brewster angle θB
—
Critical angle θC
—