Optical constants

Refractive index of C₂H₅OH (Ethanol)

Chang et al. 2024: n 0.4–2.0 µm

Data: formula 1
Range: 0.4–2 µm
Temperature: 295 K
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.3614
Extinction coefficient k: 0

Permittivity ε₁: 1.85341
Permittivity ε₂: 0

Absorption coefficient α: 0 cm⁻¹
Penetration depth δ = λ/(2πk): — nm

Abbe number V_d: 60.983
Chromatic dispersion dn/dλ: -0.0305519 µm⁻¹

Group index n_g: 1.37935
Group velocity dispersion: 55.2019 fs²/mm

Dispersion parameter D: -301.156 ps/(nm·km)
Photon energy: 2.11001 eV

ε = (n + ik)², α = 4πk/λ, n_g = 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

# C2H5OH (Ethanol): Chang et al. 2024: n 0.4–2.0 µm
c2h5oh = ls.fetch_refractiveindex("organic", "ethanol", "Chang", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c2h5oh.range_nm)  # (400, 2000) nm
eps = c2h5oh.eps([633])  # complex permittivity

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

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_2d1da6213e0b/lightsmith"
c2h5oh = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(c2h5oh.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (ethanol/chang-2024).

# ... load c2h5oh as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=c2h5oh)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=1000, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength

Same spec runs with DDA, FDTD, BEM or T-matrix: ls.compare(sim, ["mie", "dda"]).

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_2d1da6213e0b/lightsmith?model=drude_lorentz"
c2h5oh_dl = ls.DrudeLorentz.model_validate(json.load(urllib.request.urlopen(url)))

A dispersive Drude–Lorentz model for time-domain solvers.

Materials guide Open a sphere of it in Studio Quick start Ask the community

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.

Dispersion formula

Sellmeier (formula 1), λ in µm

n^{2} - 1 = \frac{0.8312 λ^{2}}{λ^{2} - {0.0964}^{2}} + \frac{0.0192 λ^{2}}{λ^{2} - {2.97}^{2}}

Valid from 0.4 to 2.0 µm.

Coefficients as stored

C_i	Value
C1	0.0
C2	0.8312
C3	0.0964
C4	0.0192
C5	2.97

Comments and conditions

21.5–22.0 °C

Conditions

temperature: 295 K

References

H.-J. Chang, N. Munera, C. Lopez-Zelaya, D. Banerjee, G. Beadie, E. W. Van Stryland, D. J. Hagan. Refractive index measurements of liquids from 0.5 to 2 µm using Rayleigh interferometry. Opt. Mater. Express 14, 1253–1267 (2024)

doi:10.1364/ome.519907 Refractive index measurements of liquids from 0.5 to 2 µm using Rayleigh interferometry, Optical Materials Express (2024)

Cite

Hao-Jung Chang et al.. Refractive index measurements of liquids from 0.5 to 2 µm using Rayleigh interferometry. Optical Materials Express, 14, 1253 (2024), doi:10.1364/ome.519907; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

Computed on 400 wavelengths, the same grid as the API and the library

CSV comma separated TXT tab separated YAML n, k Full database record original YAML All quantities CSV JSON metadata

C2H5OH (Ethanol), Chang et al. 2024: n 0.4–2.0 µm: n and k versus wavelength
λ (µm)	n
0.4	1.371896
0.401617	1.371736
0.40324	1.371577
0.40487	1.371419
0.406506	1.371263
0.408149	1.371108
0.409799	1.370955
0.411455	1.370803
0.413118	1.370652
0.414788	1.370503
0.416465	1.370354
0.418148	1.370208
0.419838	1.370062
0.421535	1.369918
0.423239	1.369775
0.424949	1.369633
0.426667	1.369492
0.428391	1.369353
0.430123	1.369215
0.431861	1.369078
0.433607	1.368942
0.435359	1.368807
0.437119	1.368674
0.438886	1.368541
0.44066	1.36841
0.442441	1.36828
0.444229	1.368151
0.446024	1.368023
0.447827	1.367896
0.449637	1.367771
0.451455	1.367646
0.453279	1.367523
0.455111	1.3674
0.456951	1.367279
0.458798	1.367158
0.460652	1.367039
0.462514	1.36692
0.464383	1.366803
0.46626	1.366687
0.468145	1.366571
0.470037	1.366457
0.471937	1.366343
0.473844	1.366231
0.47576	1.366119
0.477683	1.366008
0.479613	1.365899
0.481552	1.36579
0.483498	1.365682
0.485452	1.365575
0.487414	1.365469
0.489385	1.365364
0.491363	1.365259
0.493349	1.365156
0.495343	1.365053
0.497345	1.364952
0.499355	1.364851
0.501373	1.364751
0.5034	1.364652
0.505434	1.364553
0.507477	1.364456
0.509528	1.364359
0.511588	1.364263
0.513655	1.364168
0.515732	1.364073
0.517816	1.363979
0.519909	1.363887
0.52201	1.363795
0.52412	1.363703
0.526239	1.363613
0.528366	1.363523
0.530501	1.363434
0.532645	1.363345
0.534798	1.363257
0.53696	1.36317
0.53913	1.363084
0.541309	1.362999
0.543497	1.362914
0.545694	1.36283
0.547899	1.362746
0.550114	1.362663
0.552337	1.362581
0.55457	1.362499
0.556811	1.362419
0.559062	1.362338
0.561321	1.362259
0.56359	1.36218
0.565868	1.362102
0.568155	1.362024
0.570452	1.361947
0.572757	1.36187
0.575072	1.361795
0.577397	1.361719
0.57973	1.361645
0.582073	1.361571
0.584426	1.361497
0.586788	1.361424
0.58916	1.361352
0.591541	1.36128
0.593932	1.361209
0.596333	1.361138
0.598743	1.361068
0.601163	1.360999
0.603593	1.36093
0.606032	1.360861
0.608482	1.360793
0.610941	1.360726
0.613411	1.360659
0.61589	1.360593
0.618379	1.360527
0.620879	1.360461
0.623388	1.360397
0.625908	1.360332
0.628438	1.360268
0.630978	1.360205
0.633528	1.360142
0.636088	1.36008
0.638659	1.360018
0.641241	1.359956
0.643833	1.359895
0.646435	1.359835
0.649048	1.359775
0.651671	1.359715
0.654305	1.359656
0.656949	1.359597
0.659605	1.359539
0.662271	1.359481
0.664948	1.359423
0.667635	1.359366
0.670334	1.35931
0.673043	1.359253
0.675763	1.359198
0.678495	1.359142
0.681237	1.359087
0.68399	1.359033
0.686755	1.358978
0.689531	1.358925
0.692318	1.358871
0.695116	1.358818
0.697925	1.358766
0.700746	1.358713
0.703579	1.358661
0.706422	1.35861
0.709278	1.358559
0.712144	1.358508
0.715023	1.358458
0.717913	1.358407
0.720814	1.358358
0.723728	1.358308
0.726653	1.358259
0.72959	1.358211
0.732539	1.358162
0.7355	1.358114
0.738472	1.358066
0.741457	1.358019
0.744454	1.357972
0.747463	1.357925
0.750484	1.357879
0.753517	1.357833
0.756563	1.357787
0.759621	1.357741
0.762691	1.357696
0.765774	1.357651
0.768869	1.357607
0.771977	1.357562
0.775097	1.357518
0.77823	1.357475
0.781375	1.357431
0.784533	1.357388
0.787704	1.357345
0.790888	1.357302
0.794085	1.35726
0.797294	1.357218
0.800517	1.357176
0.803752	1.357134
0.807001	1.357093
0.810263	1.357052
0.813538	1.357011
0.816826	1.356971
0.820127	1.35693
0.823442	1.35689
0.82677	1.35685
0.830112	1.356811
0.833467	1.356771
0.836836	1.356732
0.840218	1.356693
0.843614	1.356655
0.847024	1.356616
0.850447	1.356578
0.853885	1.35654
0.857336	1.356502
0.860801	1.356465
0.86428	1.356427
0.867774	1.35639
0.871281	1.356353
0.874803	1.356316
0.878338	1.35628
0.881888	1.356243
0.885453	1.356207
0.889032	1.356171
0.892625	1.356135
0.896233	1.356099
0.899855	1.356064
0.903492	1.356029
0.907144	1.355993
0.910811	1.355959
0.914492	1.355924
0.918188	1.355889
0.921899	1.355855
0.925626	1.35582
0.929367	1.355786
0.933123	1.355752
0.936895	1.355718
0.940681	1.355685
0.944483	1.355651
0.948301	1.355618
0.952134	1.355585
0.955982	1.355551
0.959846	1.355518
0.963726	1.355486
0.967621	1.355453
0.971532	1.35542
0.975458	1.355388
0.979401	1.355356
0.98336	1.355323
0.987334	1.355291
0.991325	1.355259
0.995332	1.355227
0.999355	1.355196
1.00339	1.355164
1.00745	1.355133
1.01152	1.355101
1.01561	1.35507
1.01971	1.355039
1.02384	1.355008
1.02797	1.354976
1.03213	1.354946
1.0363	1.354915
1.04049	1.354884
1.04469	1.354853
1.04892	1.354823
1.05316	1.354792
1.05741	1.354762
1.06169	1.354731
1.06598	1.354701
1.07029	1.354671
1.07461	1.354641
1.07896	1.35461
1.08332	1.35458
1.0877	1.35455
1.09209	1.35452
1.09651	1.35449
1.10094	1.354461
1.10539	1.354431
1.10986	1.354401
1.11434	1.354371
1.11885	1.354342
1.12337	1.354312
1.12791	1.354282
1.13247	1.354253
1.13704	1.354223
1.14164	1.354194
1.14625	1.354164
1.15089	1.354135
1.15554	1.354105
1.16021	1.354076
1.1649	1.354046
1.16961	1.354017
1.17433	1.353987
1.17908	1.353958
1.18385	1.353928
1.18863	1.353899
1.19344	1.353869
1.19826	1.35384
1.2031	1.35381
1.20797	1.353781
1.21285	1.353751
1.21775	1.353721
1.22267	1.353692
1.22761	1.353662
1.23258	1.353632
1.23756	1.353603
1.24256	1.353573
1.24758	1.353543
1.25262	1.353513
1.25769	1.353483
1.26277	1.353453
1.26787	1.353423
1.273	1.353393
1.27814	1.353363
1.28331	1.353333
1.2885	1.353302
1.2937	1.353272
1.29893	1.353241
1.30418	1.353211
1.30945	1.35318
1.31475	1.353149
1.32006	1.353119
1.3254	1.353088
1.33075	1.353057
1.33613	1.353025
1.34153	1.352994
1.34696	1.352963
1.3524	1.352931
1.35787	1.352899
1.36335	1.352868
1.36886	1.352836
1.3744	1.352804
1.37995	1.352771
1.38553	1.352739
1.39113	1.352706
1.39675	1.352674
1.4024	1.352641
1.40807	1.352608
1.41376	1.352574
1.41947	1.352541
1.42521	1.352507
1.43097	1.352474
1.43675	1.35244
1.44256	1.352405
1.44839	1.352371
1.45424	1.352336
1.46012	1.352302
1.46602	1.352266
1.47195	1.352231
1.4779	1.352196
1.48387	1.35216
1.48987	1.352124
1.49589	1.352087
1.50194	1.352051
1.50801	1.352014
1.5141	1.351977
1.52022	1.351939
1.52637	1.351901
1.53254	1.351863
1.53873	1.351825
1.54495	1.351786
1.55119	1.351747
1.55746	1.351708
1.56376	1.351668
1.57008	1.351628
1.57643	1.351588
1.5828	1.351547
1.58919	1.351506
1.59562	1.351464
1.60207	1.351422
1.60854	1.351379
1.61504	1.351337
1.62157	1.351293
1.62813	1.35125
1.63471	1.351205
1.64131	1.351161
1.64795	1.351116
1.65461	1.35107
1.6613	1.351024
1.66801	1.350977
1.67475	1.35093
1.68152	1.350882
1.68832	1.350834
1.69514	1.350785
1.70199	1.350736
1.70887	1.350686
1.71578	1.350635
1.72271	1.350584
1.72968	1.350532
1.73667	1.350479
1.74369	1.350426
1.75074	1.350372
1.75781	1.350317
1.76492	1.350261
1.77205	1.350205
1.77921	1.350148
1.7864	1.35009
1.79362	1.350032
1.80087	1.349972
1.80815	1.349912
1.81546	1.349851
1.8228	1.349788
1.83017	1.349725
1.83756	1.349661
1.84499	1.349596
1.85245	1.34953
1.85993	1.349463
1.86745	1.349395
1.875	1.349326
1.88258	1.349255
1.89019	1.349184
1.89783	1.349111
1.9055	1.349037
1.9132	1.348962
1.92093	1.348885
1.9287	1.348807
1.93649	1.348728
1.94432	1.348647
1.95218	1.348565
1.96007	1.348481
1.96799	1.348395
1.97594	1.348309
1.98393	1.34822
1.99195	1.34813
2	1.348037

Optical transmission calculator

Free-standing sample in vacuum, normal incidence

Transmittance T: —
Reflectance R: —

Fresnel reflection calculator

R_p: —
R_s: —
R = (R_p+R_s)/2: —
Phase φ_p: —
Phase φ_s: —
Brewster angle θ_B: —
Critical angle θ_C: —

C₂H₅OH (Ethanol): all datasets

About C2H5OH (Ethanol)

Ethanol (C₂H₆O), often simply referred to as alcohol, is a clear, colorless liquid with a characteristic pleasant odor. It is best known as the active ingredient in alcoholic beverages but also has significant industrial and medicinal applications. As a solvent, it is widely used in the pharmaceutical and cosmetic industries. In the medical field, it serves as an antiseptic, disinfectant, and as an antidote in methanol and ethylene glycol poisoning. Ethanol is also used as a renewable fuel and fuel additive, typically referred to as bioethanol, which is produced through the fermentation of sugars by yeast. Chemical formula: C₂H₅OH

More about C2H5OH (Ethanol) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/organic/C2H6O - ethanol/nk/Chang.yml
ID: ds_2d1da6213e0b
API: /v1/datasets/ds_2d1da6213e0b

Plot