Optical constants

Refractive index of C₈H₈O₃ (Methyl salicylate)

Rheims et al. 1997: n 0.589–1.05 µm

Data: formula 5
Range: 0.5893–1.05 µm
Temperature: 298 K
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.5212
Extinction coefficient k: 0

Permittivity ε₁: 2.31404
Permittivity ε₂: 0

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

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.0418279 µm⁻¹

Group index n_g: 1.55412
Group velocity dispersion: 141.99 fs²/mm

Dispersion parameter D: -431.827 ps/(nm·km)
Photon energy: 1.5754 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

# C8H8O3 (Methyl salicylate): Rheims et al. 1997: n 0.589–1.05 µm
c8h8o3 = ls.fetch_refractiveindex("organic", "methyl_salicylate", "Rheims", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c8h8o3.range_nm)  # (589.3, 1050) nm
eps = c8h8o3.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_26836b16c00f/lightsmith"
c8h8o3 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(c8h8o3.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (methyl-salicylate/rheims-1997).

# ... load c8h8o3 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=c8h8o3)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=590, 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"]).

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 = 1.50513 + 0.00971 λ^{- 2.0} + 0.00015 λ^{- 4.0}

Valid from 0.5893 to 1.05 µm.

Coefficients as stored

C_i	Value
C1	1.50513
C2	0.00971
C3	-2.0
C4	0.00015
C5	-4.0

Comments and conditions

25 °C

Conditions

temperature: 298 K

References

J. Rheims, J Köser, T Wriedt. Refractive-index measurements in the near-IR using an Abbe refractometer. Meas. Sci. Technol. 8, 601-605 (1997)

doi:10.1088/0957-0233/8/6/003 Refractive-index measurements in the near-IR using an Abbe refractometer, Measurement Science and Technology (1997)

Cite

J Rheims, J Köser and T Wriedt. Refractive-index measurements in the near-IR using an Abbe refractometer. Measurement Science and Technology, 8, 601-605 (1997), doi:10.1088/0957-0233/8/6/003; 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

C8H8O3 (Methyl salicylate), Rheims et al. 1997: n 0.589–1.05 µm: n and k versus wavelength
λ (µm)	n
0.5893	1.534334
0.590154	1.534246
0.591009	1.534159
0.591865	1.534071
0.592722	1.533984
0.593581	1.533897
0.594441	1.53381
0.595302	1.533724
0.596164	1.533638
0.597028	1.533552
0.597893	1.533466
0.598759	1.533381
0.599627	1.533296
0.600495	1.533211
0.601365	1.533127
0.602236	1.533043
0.603109	1.532959
0.603983	1.532875
0.604858	1.532791
0.605734	1.532708
0.606611	1.532625
0.60749	1.532543
0.60837	1.53246
0.609252	1.532378
0.610134	1.532296
0.611018	1.532214
0.611903	1.532133
0.61279	1.532052
0.613677	1.531971
0.614566	1.53189
0.615457	1.53181
0.616348	1.53173
0.617241	1.53165
0.618135	1.53157
0.619031	1.531491
0.619928	1.531412
0.620826	1.531333
0.621725	1.531254
0.622626	1.531176
0.623528	1.531097
0.624431	1.53102
0.625336	1.530942
0.626242	1.530864
0.627149	1.530787
0.628058	1.53071
0.628967	1.530633
0.629879	1.530557
0.630791	1.530481
0.631705	1.530405
0.63262	1.530329
0.633536	1.530253
0.634454	1.530178
0.635373	1.530103
0.636294	1.530028
0.637216	1.529953
0.638139	1.529879
0.639063	1.529805
0.639989	1.529731
0.640916	1.529657
0.641845	1.529584
0.642775	1.529511
0.643706	1.529438
0.644638	1.529365
0.645572	1.529292
0.646507	1.52922
0.647444	1.529148
0.648382	1.529076
0.649321	1.529004
0.650262	1.528933
0.651204	1.528861
0.652147	1.52879
0.653092	1.52872
0.654038	1.528649
0.654986	1.528579
0.655935	1.528509
0.656885	1.528439
0.657836	1.528369
0.658789	1.528299
0.659744	1.52823
0.6607	1.528161
0.661657	1.528092
0.662615	1.528024
0.663575	1.527955
0.664537	1.527887
0.665499	1.527819
0.666463	1.527751
0.667429	1.527684
0.668396	1.527616
0.669364	1.527549
0.670334	1.527482
0.671305	1.527415
0.672277	1.527349
0.673251	1.527282
0.674227	1.527216
0.675203	1.52715
0.676182	1.527084
0.677161	1.527019
0.678142	1.526954
0.679125	1.526888
0.680108	1.526824
0.681094	1.526759
0.68208	1.526694
0.683068	1.52663
0.684058	1.526566
0.685049	1.526502
0.686041	1.526438
0.687035	1.526375
0.688031	1.526311
0.689027	1.526248
0.690026	1.526185
0.691025	1.526122
0.692026	1.52606
0.693029	1.525997
0.694033	1.525935
0.695038	1.525873
0.696045	1.525811
0.697053	1.52575
0.698063	1.525688
0.699075	1.525627
0.700087	1.525566
0.701102	1.525505
0.702117	1.525444
0.703134	1.525384
0.704153	1.525323
0.705173	1.525263
0.706195	1.525203
0.707218	1.525144
0.708242	1.525084
0.709268	1.525025
0.710296	1.524965
0.711325	1.524906
0.712355	1.524847
0.713387	1.524789
0.714421	1.52473
0.715456	1.524672
0.716492	1.524614
0.71753	1.524556
0.71857	1.524498
0.719611	1.52444
0.720653	1.524383
0.721697	1.524326
0.722743	1.524269
0.72379	1.524212
0.724838	1.524155
0.725888	1.524098
0.72694	1.524042
0.727993	1.523986
0.729048	1.52393
0.730104	1.523874
0.731162	1.523818
0.732221	1.523763
0.733282	1.523707
0.734344	1.523652
0.735408	1.523597
0.736473	1.523542
0.73754	1.523487
0.738608	1.523433
0.739678	1.523378
0.74075	1.523324
0.741823	1.52327
0.742898	1.523216
0.743974	1.523163
0.745052	1.523109
0.746131	1.523056
0.747212	1.523002
0.748295	1.522949
0.749379	1.522897
0.750464	1.522844
0.751551	1.522791
0.75264	1.522739
0.753731	1.522687
0.754822	1.522634
0.755916	1.522582
0.757011	1.522531
0.758108	1.522479
0.759206	1.522428
0.760306	1.522376
0.761407	1.522325
0.76251	1.522274
0.763615	1.522223
0.764721	1.522173
0.765829	1.522122
0.766939	1.522072
0.76805	1.522021
0.769162	1.521971
0.770277	1.521921
0.771392	1.521872
0.77251	1.521822
0.773629	1.521773
0.77475	1.521723
0.775872	1.521674
0.776996	1.521625
0.778122	1.521576
0.779249	1.521527
0.780378	1.521479
0.781508	1.52143
0.782641	1.521382
0.783774	1.521334
0.78491	1.521286
0.786047	1.521238
0.787186	1.52119
0.788326	1.521143
0.789468	1.521096
0.790612	1.521048
0.791757	1.521001
0.792904	1.520954
0.794053	1.520907
0.795203	1.520861
0.796355	1.520814
0.797509	1.520768
0.798664	1.520721
0.799821	1.520675
0.80098	1.520629
0.80214	1.520583
0.803302	1.520538
0.804466	1.520492
0.805632	1.520447
0.806799	1.520401
0.807968	1.520356
0.809138	1.520311
0.81031	1.520266
0.811484	1.520221
0.81266	1.520177
0.813837	1.520132
0.815016	1.520088
0.816197	1.520044
0.817379	1.52
0.818563	1.519956
0.819749	1.519912
0.820937	1.519868
0.822126	1.519825
0.823317	1.519781
0.82451	1.519738
0.825704	1.519695
0.8269	1.519652
0.828098	1.519609
0.829298	1.519566
0.830499	1.519523
0.831702	1.519481
0.832907	1.519438
0.834114	1.519396
0.835322	1.519354
0.836532	1.519312
0.837744	1.51927
0.838958	1.519228
0.840173	1.519187
0.84139	1.519145
0.842609	1.519104
0.84383	1.519063
0.845053	1.519021
0.846277	1.51898
0.847503	1.51894
0.848731	1.518899
0.84996	1.518858
0.851191	1.518818
0.852425	1.518777
0.853659	1.518737
0.854896	1.518697
0.856135	1.518657
0.857375	1.518617
0.858617	1.518577
0.859861	1.518537
0.861106	1.518498
0.862354	1.518458
0.863603	1.518419
0.864854	1.51838
0.866107	1.518341
0.867362	1.518302
0.868619	1.518263
0.869877	1.518224
0.871137	1.518186
0.872399	1.518147
0.873663	1.518109
0.874929	1.51807
0.876196	1.518032
0.877465	1.517994
0.878737	1.517956
0.88001	1.517919
0.881284	1.517881
0.882561	1.517843
0.88384	1.517806
0.88512	1.517768
0.886402	1.517731
0.887687	1.517694
0.888973	1.517657
0.89026	1.51762
0.89155	1.517583
0.892842	1.517547
0.894135	1.51751
0.89543	1.517474
0.896728	1.517437
0.898027	1.517401
0.899328	1.517365
0.900631	1.517329
0.901935	1.517293
0.903242	1.517257
0.90455	1.517221
0.905861	1.517186
0.907173	1.51715
0.908487	1.517115
0.909804	1.51708
0.911122	1.517044
0.912441	1.517009
0.913763	1.516974
0.915087	1.51694
0.916413	1.516905
0.91774	1.51687
0.91907	1.516836
0.920401	1.516801
0.921735	1.516767
0.92307	1.516733
0.924407	1.516698
0.925746	1.516664
0.927088	1.51663
0.928431	1.516597
0.929776	1.516563
0.931123	1.516529
0.932472	1.516496
0.933822	1.516462
0.935175	1.516429
0.93653	1.516396
0.937887	1.516363
0.939245	1.51633
0.940606	1.516297
0.941969	1.516264
0.943333	1.516231
0.9447	1.516198
0.946069	1.516166
0.947439	1.516133
0.948812	1.516101
0.950186	1.516069
0.951563	1.516037
0.952941	1.516005
0.954322	1.515973
0.955704	1.515941
0.957089	1.515909
0.958475	1.515877
0.959864	1.515846
0.961254	1.515814
0.962647	1.515783
0.964042	1.515752
0.965438	1.51572
0.966837	1.515689
0.968237	1.515658
0.96964	1.515627
0.971045	1.515596
0.972452	1.515566
0.97386	1.515535
0.975271	1.515504
0.976684	1.515474
0.978099	1.515444
0.979516	1.515413
0.980935	1.515383
0.982356	1.515353
0.983779	1.515323
0.985204	1.515293
0.986632	1.515263
0.988061	1.515233
0.989492	1.515204
0.990926	1.515174
0.992361	1.515145
0.993799	1.515115
0.995239	1.515086
0.99668	1.515057
0.998124	1.515028
0.99957	1.514999
1.00102	1.51497
1.00247	1.514941
1.00392	1.514912
1.00538	1.514883
1.00683	1.514855
1.00829	1.514826
1.00975	1.514798
1.01121	1.514769
1.01268	1.514741
1.01415	1.514713
1.01562	1.514685
1.01709	1.514657
1.01856	1.514629
1.02004	1.514601
1.02151	1.514573
1.02299	1.514545
1.02447	1.514518
1.02596	1.51449
1.02745	1.514463
1.02893	1.514435
1.03042	1.514408
1.03192	1.514381
1.03341	1.514354
1.03491	1.514327
1.03641	1.5143
1.03791	1.514273
1.03941	1.514246
1.04092	1.514219
1.04243	1.514193
1.04394	1.514166
1.04545	1.51414
1.04696	1.514113
1.04848	1.514087
1.05	1.514061

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: —

C₈H₈O₃ (Methyl salicylate): all datasets

Rheims et al. 1997: n 0.589–1.05 µm n 0.5893–1.05 µm default

About C8H8O3 (Methyl salicylate)

Methyl salicylate (C₈H₈O₃) is an organic ester that is naturally produced by many species of plants, particularly wintergreens. It has a minty aroma and is used as a flavoring agent in some products. Medically, it's employed as a counterirritant in topical analgesics to relieve minor body aches and pains. In the field of optics, its transparent characteristics can be beneficial in various applications. However, care should be taken in its use, as it is toxic when ingested in large amounts. Chemical formula: C₆H₄(HO)COOCH₃

More about C8H8O3 (Methyl salicylate) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/organic/C8H8O3 - methyl salicylate/nk/Rheims.yml
ID: ds_26836b16c00f
API: /v1/datasets/ds_26836b16c00f

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