Optical constants

Refractive index of C₂H₄(OH)₂ (Ethylene glycol)

Kozma et al. 2005: n 0.230–0.641 µm

Data: formula 5
Range: 0.23–0.6407 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: 1.43184
Extinction coefficient k: 0

Permittivity ε₁: 2.05017
Permittivity ε₂: 0

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

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.0255121 µm⁻¹

Group index n_g: 1.44683
Group velocity dispersion: 54.0702 fs²/mm

Dispersion parameter D: -294.982 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

# C2H4(OH)2 (Ethylene glycol): Kozma et al. 2005: n 0.230–0.641 µm
c2h4 = ls.fetch_refractiveindex("organic", "ethylene_glycol", "Kozma", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c2h4.range_nm)  # (230, 640.7) nm
eps = c2h4.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_3ccb0ddfd200/lightsmith"
c2h4 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(c2h4.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (ethylene-glycol/kozma-2005).

# ... load c2h4 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=c2h4)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=640, 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"]).

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

Cauchy (formula 5), λ in µm

n = 1.42522 + 0.00198454821 λ^{- 2.0} + 0.000104174632 λ^{- 4.0}

Valid from 0.23 to 0.6407 µm.

Coefficients as stored

C_i	Value
C1	1.42522
C2	0.00198454821
C3	-2.0
C4	0.000104174632
C5	-4.0

Comments and conditions

22 °C

Conditions

temperature: 295 K

References

I. Z. Kozma, P. Krok, E. Riedle. Direct measurement of the group-velocity mismatch and derivation of the refractive-index dispersion for a variety of solvents in the ultraviolet. J. Opt. Soc. Am. B 22, 1479-1485 (2005)

doi:10.1364/josab.22.001479 Direct measurement of the group-velocity mismatch and derivation of the refractive-index dispersion for a variety of solvents in the ultraviolet, Journal of the Optical Society of America B (2005)

Cite

Ida Z. Kozma, Patrizia Krok and Eberhard Riedle. Direct measurement of the group-velocity mismatch and derivation of the refractive-index dispersion for a variety of solvents in the ultraviolet. Journal of the Optical Society of America B, 22, 1479 (2005), doi:10.1364/josab.22.001479; 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

C2H4(OH)2 (Ethylene glycol), Kozma et al. 2005: n 0.230–0.641 µm: n and k versus wavelength
λ (µm)	n
0.23	1.499961
0.230591	1.499389
0.231184	1.498821
0.231779	1.498258
0.232374	1.4977
0.232972	1.497147
0.233571	1.496598
0.234171	1.496054
0.234773	1.495515
0.235377	1.49498
0.235982	1.49445
0.236589	1.493924
0.237197	1.493403
0.237807	1.492886
0.238418	1.492373
0.239031	1.491865
0.239646	1.491361
0.240262	1.490861
0.240879	1.490366
0.241499	1.489875
0.24212	1.489387
0.242742	1.488904
0.243366	1.488425
0.243992	1.48795
0.244619	1.487479
0.245248	1.487012
0.245879	1.486548
0.246511	1.486089
0.247144	1.485634
0.24778	1.485182
0.248417	1.484734
0.249055	1.48429
0.249696	1.483849
0.250338	1.483412
0.250981	1.482979
0.251627	1.482549
0.252273	1.482123
0.252922	1.481701
0.253572	1.481282
0.254224	1.480866
0.254878	1.480454
0.255533	1.480045
0.25619	1.47964
0.256849	1.479238
0.257509	1.478839
0.258171	1.478444
0.258835	1.478052
0.2595	1.477663
0.260167	1.477277
0.260836	1.476895
0.261507	1.476515
0.262179	1.476139
0.262853	1.475766
0.263529	1.475396
0.264207	1.475029
0.264886	1.474665
0.265567	1.474304
0.26625	1.473946
0.266934	1.47359
0.26762	1.473238
0.268308	1.472889
0.268998	1.472542
0.26969	1.472198
0.270383	1.471857
0.271078	1.471519
0.271775	1.471184
0.272474	1.470851
0.273174	1.470521
0.273877	1.470193
0.274581	1.469869
0.275287	1.469547
0.275994	1.469227
0.276704	1.46891
0.277415	1.468596
0.278129	1.468284
0.278844	1.467975
0.279561	1.467668
0.280279	1.467364
0.281	1.467062
0.281722	1.466762
0.282447	1.466465
0.283173	1.466171
0.283901	1.465878
0.284631	1.465588
0.285362	1.465301
0.286096	1.465015
0.286832	1.464732
0.287569	1.464451
0.288308	1.464173
0.289049	1.463897
0.289793	1.463622
0.290538	1.46335
0.291285	1.463081
0.292033	1.462813
0.292784	1.462547
0.293537	1.462284
0.294292	1.462023
0.295048	1.461763
0.295807	1.461506
0.296567	1.461251
0.29733	1.460998
0.298094	1.460747
0.298861	1.460497
0.299629	1.46025
0.300399	1.460005
0.301171	1.459761
0.301946	1.45952
0.302722	1.45928
0.3035	1.459043
0.304281	1.458807
0.305063	1.458573
0.305847	1.458341
0.306633	1.458111
0.307422	1.457882
0.308212	1.457655
0.309005	1.45743
0.309799	1.457207
0.310595	1.456986
0.311394	1.456766
0.312195	1.456548
0.312997	1.456332
0.313802	1.456117
0.314609	1.455904
0.315417	1.455693
0.316228	1.455483
0.317041	1.455275
0.317856	1.455068
0.318674	1.454863
0.319493	1.45466
0.320314	1.454458
0.321138	1.454258
0.321963	1.454059
0.322791	1.453862
0.323621	1.453667
0.324453	1.453473
0.325287	1.45328
0.326124	1.453089
0.326962	1.452899
0.327803	1.452711
0.328645	1.452524
0.32949	1.452339
0.330337	1.452155
0.331187	1.451972
0.332038	1.451791
0.332892	1.451611
0.333748	1.451433
0.334606	1.451256
0.335466	1.45108
0.336328	1.450906
0.337193	1.450733
0.33806	1.450561
0.338929	1.450391
0.3398	1.450221
0.340674	1.450054
0.34155	1.449887
0.342428	1.449722
0.343308	1.449557
0.344191	1.449395
0.345076	1.449233
0.345963	1.449073
0.346852	1.448913
0.347744	1.448755
0.348638	1.448598
0.349534	1.448443
0.350433	1.448288
0.351334	1.448135
0.352237	1.447983
0.353143	1.447832
0.354051	1.447682
0.354961	1.447533
0.355874	1.447385
0.356788	1.447238
0.357706	1.447093
0.358625	1.446948
0.359547	1.446805
0.360472	1.446663
0.361398	1.446521
0.362328	1.446381
0.363259	1.446242
0.364193	1.446104
0.365129	1.445967
0.366068	1.445831
0.367009	1.445695
0.367953	1.445561
0.368899	1.445428
0.369847	1.445296
0.370798	1.445165
0.371751	1.445035
0.372707	1.444905
0.373665	1.444777
0.374626	1.44465
0.375589	1.444523
0.376555	1.444397
0.377523	1.444273
0.378493	1.444149
0.379466	1.444026
0.380442	1.443904
0.38142	1.443783
0.382401	1.443663
0.383384	1.443544
0.384369	1.443425
0.385358	1.443308
0.386348	1.443191
0.387342	1.443075
0.388337	1.44296
0.389336	1.442846
0.390337	1.442733
0.39134	1.44262
0.392346	1.442508
0.393355	1.442397
0.394366	1.442287
0.39538	1.442178
0.396397	1.442069
0.397416	1.441961
0.398438	1.441854
0.399462	1.441748
0.400489	1.441643
0.401519	1.441538
0.402551	1.441434
0.403586	1.441331
0.404623	1.441228
0.405664	1.441126
0.406707	1.441025
0.407752	1.440925
0.4088	1.440825
0.409851	1.440726
0.410905	1.440628
0.411962	1.44053
0.413021	1.440434
0.414083	1.440337
0.415147	1.440242
0.416214	1.440147
0.417284	1.440053
0.418357	1.43996
0.419433	1.439867
0.420511	1.439775
0.421592	1.439683
0.422676	1.439592
0.423763	1.439502
0.424852	1.439412
0.425945	1.439323
0.42704	1.439235
0.428137	1.439147
0.429238	1.43906
0.430342	1.438973
0.431448	1.438888
0.432557	1.438802
0.433669	1.438718
0.434784	1.438633
0.435902	1.43855
0.437023	1.438467
0.438146	1.438384
0.439273	1.438303
0.440402	1.438221
0.441534	1.438141
0.44267	1.43806
0.443808	1.437981
0.444949	1.437902
0.446092	1.437823
0.447239	1.437745
0.448389	1.437668
0.449542	1.437591
0.450698	1.437515
0.451856	1.437439
0.453018	1.437364
0.454183	1.437289
0.45535	1.437214
0.456521	1.437141
0.457695	1.437067
0.458871	1.436995
0.460051	1.436922
0.461234	1.436851
0.46242	1.436779
0.463609	1.436708
0.464801	1.436638
0.465995	1.436568
0.467194	1.436499
0.468395	1.43643
0.469599	1.436361
0.470806	1.436293
0.472017	1.436226
0.47323	1.436159
0.474447	1.436092
0.475666	1.436026
0.476889	1.43596
0.478115	1.435895
0.479345	1.43583
0.480577	1.435766
0.481813	1.435702
0.483051	1.435638
0.484293	1.435575
0.485538	1.435513
0.486786	1.43545
0.488038	1.435388
0.489293	1.435327
0.490551	1.435266
0.491812	1.435205
0.493076	1.435145
0.494344	1.435085
0.495615	1.435026
0.496889	1.434967
0.498166	1.434908
0.499447	1.43485
0.500731	1.434792
0.502019	1.434735
0.503309	1.434678
0.504603	1.434621
0.5059	1.434564
0.507201	1.434509
0.508505	1.434453
0.509812	1.434398
0.511123	1.434343
0.512437	1.434288
0.513755	1.434234
0.515075	1.43418
0.5164	1.434127
0.517727	1.434074
0.519058	1.434021
0.520393	1.433969
0.521731	1.433917
0.523072	1.433865
0.524417	1.433814
0.525765	1.433763
0.527117	1.433712
0.528472	1.433661
0.529831	1.433611
0.531193	1.433562
0.532558	1.433512
0.533927	1.433463
0.5353	1.433414
0.536676	1.433366
0.538056	1.433318
0.539439	1.43327
0.540826	1.433223
0.542217	1.433175
0.543611	1.433129
0.545008	1.433082
0.546409	1.433036
0.547814	1.43299
0.549223	1.432944
0.550635	1.432899
0.55205	1.432853
0.55347	1.432809
0.554892	1.432764
0.556319	1.43272
0.557749	1.432676
0.559183	1.432632
0.560621	1.432589
0.562062	1.432546
0.563507	1.432503
0.564956	1.43246
0.566408	1.432418
0.567865	1.432376
0.569325	1.432334
0.570788	1.432293
0.572256	1.432252
0.573727	1.432211
0.575202	1.43217
0.576681	1.432129
0.578163	1.432089
0.57965	1.432049
0.58114	1.43201
0.582634	1.43197
0.584132	1.431931
0.585634	1.431892
0.587139	1.431853
0.588649	1.431815
0.590162	1.431777
0.591679	1.431739
0.593201	1.431701
0.594726	1.431664
0.596255	1.431626
0.597788	1.431589
0.599324	1.431553
0.600865	1.431516
0.60241	1.43148
0.603959	1.431444
0.605512	1.431408
0.607068	1.431372
0.608629	1.431337
0.610194	1.431301
0.611762	1.431266
0.613335	1.431232
0.614912	1.431197
0.616493	1.431163
0.618078	1.431129
0.619667	1.431095
0.62126	1.431061
0.622857	1.431028
0.624459	1.430994
0.626064	1.430961
0.627674	1.430928
0.629287	1.430896
0.630905	1.430863
0.632527	1.430831
0.634153	1.430799
0.635784	1.430767
0.637418	1.430735
0.639057	1.430704
0.6407	1.430673

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: —

C₂H₄(OH)₂ (Ethylene glycol): all datasets

About C2H4(OH)2 (Ethylene glycol)

Ethylene (C₂H₄) is a colorless, flammable gas with a slightly sweet odor. It is the simplest alkene and is produced in vast quantities in the petrochemical industry. Ethylene plays a critical role in the synthetic polymer industry, being the precursor to polyethylene, the world's most widely used plastic. Besides its significance in polymer synthesis, ethylene is a naturally occurring plant hormone responsible for fruit ripening and flower wilting. Due to its importance in both industrial and natural processes, ethylene production and its role in plant biology have been extensively studied. In the industrial setting, it's crucial to store and transport ethylene under controlled conditions due to its flammability.

More about C2H4(OH)2 (Ethylene glycol) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/organic/C2H6O2 - ethylene glycol/nk/Kozma.yml
ID: ds_3ccb0ddfd200
API: /v1/datasets/ds_3ccb0ddfd200

Plot