Optical constants

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

El-Kashef 2000: n 0.4–0.8 µm

Data: formula 5
Range: 0.4–0.8 µm
Temperature: 293 K
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.43854
Extinction coefficient k: 0

Permittivity ε₁: 2.06938
Permittivity ε₂: 0

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

Abbe number V_d: 12.861
Chromatic dispersion dn/dλ: -0.176023 µm⁻¹

Group index n_g: 1.54197
Group velocity dispersion: 322.874 fs²/mm

Dispersion parameter D: -1761.45 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): El-Kashef 2000: n 0.4–0.8 µm
c2h4 = ls.fetch_refractiveindex("organic", "ethylene_glycol", "El-Kashef", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c2h4.range_nm)  # (400, 800) 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_ecef18dc2aea/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/el-kashef-2000).

# ... 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=800, 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 = 1.38682 + 0.017856021 λ^{- 2.0}

Valid from 0.4 to 0.8 µm.

Coefficients as stored

C_i	Value
C1	1.38682
C2	0.017856021
C3	-2.0

Comments and conditions

20 °C

Conditions

temperature: 293 K

References

H. El-Kashef. The necessary requirements imposed on polar dielectric laser dye solvents. Physica B 279, 295-301 (2000)

doi:10.1016/s0921-4526(99)00856-x The necessary requirements imposed on polar dielectric laser dye solvents, Physica B: Condensed Matter (2000)

Cite

Hassan El-Kashef. The necessary requirements imposed on polar dielectric laser dye solvents. Physica B: Condensed Matter, 279, 295-301 (2000), doi:10.1016/s0921-4526(99)00856-x; 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), El-Kashef 2000: n 0.4–0.8 µm: n and k versus wavelength
λ (µm)	n
0.4	1.49842
0.400695	1.498033
0.401392	1.497647
0.40209	1.497263
0.402789	1.49688
0.40349	1.496498
0.404191	1.496118
0.404894	1.495739
0.405598	1.495361
0.406303	1.494984
0.40701	1.494609
0.407717	1.494235
0.408426	1.493863
0.409136	1.493492
0.409848	1.493122
0.41056	1.492753
0.411274	1.492385
0.411989	1.492019
0.412706	1.491654
0.413423	1.491291
0.414142	1.490929
0.414862	1.490567
0.415583	1.490208
0.416306	1.489849
0.41703	1.489492
0.417755	1.489136
0.418481	1.488781
0.419209	1.488427
0.419938	1.488075
0.420668	1.487723
0.421399	1.487373
0.422132	1.487025
0.422866	1.486677
0.423601	1.486331
0.424338	1.485986
0.425076	1.485642
0.425815	1.485299
0.426555	1.484957
0.427297	1.484617
0.42804	1.484278
0.428784	1.48394
0.429529	1.483603
0.430276	1.483267
0.431024	1.482933
0.431774	1.482599
0.432525	1.482267
0.433277	1.481936
0.43403	1.481606
0.434785	1.481277
0.435541	1.48095
0.436298	1.480623
0.437056	1.480298
0.437816	1.479974
0.438578	1.479651
0.43934	1.479329
0.440104	1.479008
0.440869	1.478688
0.441636	1.47837
0.442404	1.478052
0.443173	1.477736
0.443943	1.47742
0.444715	1.477106
0.445489	1.476793
0.446263	1.476481
0.447039	1.47617
0.447816	1.47586
0.448595	1.475551
0.449375	1.475243
0.450156	1.474937
0.450939	1.474631
0.451723	1.474326
0.452508	1.474023
0.453295	1.473721
0.454083	1.473419
0.454873	1.473119
0.455664	1.472819
0.456456	1.472521
0.45725	1.472224
0.458045	1.471928
0.458841	1.471632
0.459639	1.471338
0.460438	1.471045
0.461239	1.470753
0.462041	1.470462
0.462844	1.470172
0.463649	1.469883
0.464455	1.469595
0.465263	1.469308
0.466072	1.469021
0.466882	1.468736
0.467694	1.468452
0.468507	1.468169
0.469321	1.467887
0.470137	1.467606
0.470955	1.467326
0.471774	1.467046
0.472594	1.466768
0.473416	1.466491
0.474239	1.466214
0.475063	1.465939
0.475889	1.465665
0.476717	1.465391
0.477546	1.465119
0.478376	1.464847
0.479208	1.464577
0.480041	1.464307
0.480876	1.464038
0.481712	1.46377
0.482549	1.463503
0.483388	1.463237
0.484229	1.462972
0.485071	1.462708
0.485914	1.462445
0.486759	1.462183
0.487605	1.461921
0.488453	1.461661
0.489303	1.461401
0.490153	1.461143
0.491006	1.460885
0.491859	1.460628
0.492714	1.460372
0.493571	1.460117
0.494429	1.459863
0.495289	1.459609
0.49615	1.459357
0.497013	1.459105
0.497877	1.458854
0.498743	1.458605
0.49961	1.458356
0.500479	1.458108
0.501349	1.45786
0.50222	1.457614
0.503094	1.457368
0.503968	1.457124
0.504845	1.45688
0.505722	1.456637
0.506602	1.456395
0.507483	1.456153
0.508365	1.455913
0.509249	1.455673
0.510134	1.455434
0.511021	1.455196
0.51191	1.454959
0.5128	1.454723
0.513692	1.454487
0.514585	1.454253
0.515479	1.454019
0.516376	1.453786
0.517274	1.453554
0.518173	1.453322
0.519074	1.453091
0.519976	1.452862
0.52088	1.452633
0.521786	1.452404
0.522693	1.452177
0.523602	1.45195
0.524513	1.451724
0.525425	1.451499
0.526338	1.451275
0.527253	1.451051
0.52817	1.450828
0.529088	1.450606
0.530008	1.450385
0.53093	1.450165
0.531853	1.449945
0.532778	1.449726
0.533704	1.449508
0.534632	1.44929
0.535562	1.449074
0.536493	1.448858
0.537426	1.448643
0.53836	1.448428
0.539296	1.448215
0.540234	1.448002
0.541173	1.447789
0.542114	1.447578
0.543057	1.447367
0.544001	1.447157
0.544947	1.446948
0.545894	1.446739
0.546843	1.446532
0.547794	1.446324
0.548747	1.446118
0.549701	1.445912
0.550657	1.445707
0.551614	1.445503
0.552573	1.4453
0.553534	1.445097
0.554496	1.444895
0.55546	1.444693
0.556426	1.444493
0.557394	1.444293
0.558363	1.444093
0.559334	1.443895
0.560306	1.443697
0.56128	1.443499
0.562256	1.443303
0.563234	1.443107
0.564213	1.442912
0.565194	1.442717
0.566177	1.442523
0.567161	1.44233
0.568148	1.442137
0.569135	1.441946
0.570125	1.441754
0.571116	1.441564
0.572109	1.441374
0.573104	1.441185
0.5741	1.440996
0.575099	1.440808
0.576099	1.440621
0.5771	1.440434
0.578104	1.440249
0.579109	1.440063
0.580116	1.439879
0.581124	1.439695
0.582135	1.439511
0.583147	1.439328
0.584161	1.439146
0.585177	1.438965
0.586194	1.438784
0.587213	1.438604
0.588234	1.438424
0.589257	1.438245
0.590282	1.438067
0.591308	1.437889
0.592336	1.437712
0.593366	1.437535
0.594398	1.437359
0.595431	1.437184
0.596466	1.437009
0.597504	1.436835
0.598542	1.436662
0.599583	1.436489
0.600626	1.436317
0.60167	1.436145
0.602716	1.435974
0.603764	1.435804
0.604814	1.435634
0.605865	1.435464
0.606919	1.435296
0.607974	1.435127
0.609031	1.43496
0.61009	1.434793
0.611151	1.434627
0.612214	1.434461
0.613278	1.434296
0.614344	1.434131
0.615413	1.433967
0.616483	1.433803
0.617554	1.43364
0.618628	1.433478
0.619704	1.433316
0.620781	1.433155
0.621861	1.432994
0.622942	1.432834
0.624025	1.432674
0.62511	1.432515
0.626197	1.432357
0.627286	1.432199
0.628376	1.432041
0.629469	1.431885
0.630563	1.431728
0.63166	1.431573
0.632758	1.431417
0.633858	1.431263
0.63496	1.431109
0.636064	1.430955
0.63717	1.430802
0.638278	1.430649
0.639388	1.430497
0.6405	1.430346
0.641613	1.430195
0.642729	1.430044
0.643847	1.429894
0.644966	1.429745
0.646087	1.429596
0.647211	1.429448
0.648336	1.4293
0.649463	1.429153
0.650593	1.429006
0.651724	1.42886
0.652857	1.428714
0.653992	1.428568
0.655129	1.428424
0.656268	1.428279
0.657409	1.428135
0.658552	1.427992
0.659697	1.427849
0.660844	1.427707
0.661993	1.427565
0.663145	1.427424
0.664298	1.427283
0.665453	1.427143
0.66661	1.427003
0.667769	1.426864
0.66893	1.426725
0.670093	1.426586
0.671258	1.426448
0.672425	1.426311
0.673594	1.426174
0.674765	1.426037
0.675939	1.425901
0.677114	1.425766
0.678291	1.425631
0.679471	1.425496
0.680652	1.425362
0.681835	1.425228
0.683021	1.425095
0.684209	1.424962
0.685398	1.42483
0.68659	1.424698
0.687784	1.424567
0.68898	1.424436
0.690177	1.424305
0.691378	1.424175
0.69258	1.424046
0.693784	1.423917
0.69499	1.423788
0.696199	1.42366
0.697409	1.423532
0.698622	1.423405
0.699836	1.423278
0.701053	1.423151
0.702272	1.423025
0.703493	1.4229
0.704716	1.422775
0.705942	1.42265
0.707169	1.422526
0.708399	1.422402
0.70963	1.422278
0.710864	1.422156
0.7121	1.422033
0.713338	1.421911
0.714579	1.421789
0.715821	1.421668
0.717066	1.421547
0.718312	1.421427
0.719561	1.421306
0.720813	1.421187
0.722066	1.421068
0.723321	1.420949
0.724579	1.420831
0.725839	1.420713
0.727101	1.420595
0.728365	1.420478
0.729631	1.420361
0.7309	1.420245
0.732171	1.420129
0.733444	1.420013
0.734719	1.419898
0.735997	1.419783
0.737276	1.419669
0.738558	1.419555
0.739842	1.419442
0.741129	1.419329
0.742417	1.419216
0.743708	1.419103
0.745001	1.418991
0.746297	1.41888
0.747594	1.418769
0.748894	1.418658
0.750196	1.418547
0.751501	1.418437
0.752807	1.418328
0.754116	1.418218
0.755427	1.41811
0.756741	1.418001
0.758057	1.417893
0.759375	1.417785
0.760695	1.417678
0.762018	1.417571
0.763343	1.417464
0.76467	1.417358
0.765999	1.417252
0.767331	1.417146
0.768665	1.417041
0.770002	1.416936
0.771341	1.416832
0.772682	1.416728
0.774025	1.416624
0.775371	1.416521
0.776719	1.416418
0.77807	1.416315
0.779423	1.416213
0.780778	1.416111
0.782135	1.416009
0.783495	1.415908
0.784858	1.415807
0.786222	1.415706
0.787589	1.415606
0.788959	1.415506
0.790331	1.415407
0.791705	1.415308
0.793081	1.415209
0.79446	1.41511
0.795842	1.415012
0.797225	1.414915
0.798611	1.414817
0.8	1.41472

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/El-Kashef.yml
ID: ds_ecef18dc2aea
API: /v1/datasets/ds_ecef18dc2aea

Plot