Optical constants

Refractive index of (C₈H₈)_n (Polystyrene, PS)

Nyakuchena et al. 2023: n 1.10–1.65 µm

Data: formula 5
Range: 1.1–1.65 µm
Temperature: 296 K
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.56885
Extinction coefficient k: 0

Permittivity ε₁: 2.4613
Permittivity ε₂: 0

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

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.00644853 µm⁻¹

Group index n_g: 1.57756
Group velocity dispersion: 76.7812 fs²/mm

Dispersion parameter D: -79.3574 ps/(nm·km)
Photon energy: 0.918401 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

# (C8H8)n (Polystyrene, PS): Nyakuchena et al. 2023: n 1.10–1.65 µm
polystyrene = ls.fetch_refractiveindex("organic", "polystyrene", "Nyakuchena", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(polystyrene.range_nm)  # (1100, 1650) nm
eps = polystyrene.eps([1350])  # 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_3221299c87da/lightsmith"
polystyrene = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(polystyrene.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (polystyrene/nyakuchena-2023).

# ... load polystyrene as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=polystyrene)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=1100, stop_nm=1650, 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 = 1.563 + 0.00041159 λ^{2.0} + 0.0093 λ^{- 2.0}

Valid from 1.1 to 1.65 µm.

Coefficients as stored

C_i	Value
C1	1.563
C2	0.00041159
C3	2.0
C4	0.0093
C5	-2.0

Comments and conditions

Polymer microspheres. 23 °C

Conditions

temperature: 296 K

References

M. Nyakuchena, C. Juntunen, P. Shea, Y. Sung. Refractive index dispersion measurement in the short-wave infrared range using synthetic phase microscopy. Phys. Chem. Chem. Phys. 25, 23141-23149 (2023)

doi:10.1039/d3cp03158f Refractive index dispersion measurement in the short-wave infrared range using synthetic phase microscopy, Physical Chemistry Chemical Physics (2023)

Cite

Melisa Nyakuchena, Cory Juntunen, Peter Shea and Yongjin Sung. Refractive index dispersion measurement in the short-wave infrared range using synthetic phase microscopy. Physical Chemistry Chemical Physics, 25, 23141-23149 (2023), doi:10.1039/d3cp03158f; 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

(C8H8)n (Polystyrene, PS), Nyakuchena et al. 2023: n 1.10–1.65 µm: n and k versus wavelength
λ (µm)	n
1.1	1.571184
1.10112	1.571169
1.10224	1.571155
1.10336	1.57114
1.10448	1.571126
1.1056	1.571111
1.10673	1.571097
1.10785	1.571083
1.10898	1.571068
1.11011	1.571054
1.11124	1.57104
1.11237	1.571025
1.1135	1.571011
1.11463	1.570997
1.11576	1.570983
1.1169	1.570969
1.11803	1.570955
1.11917	1.57094
1.12031	1.570926
1.12145	1.570912
1.12259	1.570898
1.12373	1.570885
1.12487	1.570871
1.12601	1.570857
1.12716	1.570843
1.1283	1.570829
1.12945	1.570815
1.1306	1.570802
1.13175	1.570788
1.1329	1.570774
1.13405	1.570761
1.1352	1.570747
1.13636	1.570733
1.13751	1.57072
1.13867	1.570706
1.13983	1.570693
1.14099	1.57068
1.14215	1.570666
1.14331	1.570653
1.14447	1.570639
1.14563	1.570626
1.1468	1.570613
1.14796	1.570599
1.14913	1.570586
1.1503	1.570573
1.15147	1.57056
1.15264	1.570547
1.15381	1.570534
1.15499	1.570521
1.15616	1.570508
1.15734	1.570495
1.15851	1.570482
1.15969	1.570469
1.16087	1.570456
1.16205	1.570443
1.16323	1.57043
1.16441	1.570417
1.1656	1.570404
1.16678	1.570392
1.16797	1.570379
1.16916	1.570366
1.17035	1.570354
1.17153	1.570341
1.17273	1.570328
1.17392	1.570316
1.17511	1.570303
1.17631	1.570291
1.1775	1.570278
1.1787	1.570266
1.1799	1.570253
1.1811	1.570241
1.1823	1.570229
1.1835	1.570216
1.1847	1.570204
1.18591	1.570192
1.18711	1.570179
1.18832	1.570167
1.18953	1.570155
1.19074	1.570143
1.19195	1.570131
1.19316	1.570119
1.19437	1.570106
1.19559	1.570094
1.1968	1.570082
1.19802	1.57007
1.19924	1.570058
1.20046	1.570047
1.20168	1.570035
1.2029	1.570023
1.20412	1.570011
1.20535	1.569999
1.20657	1.569987
1.2078	1.569976
1.20903	1.569964
1.21026	1.569952
1.21149	1.569941
1.21272	1.569929
1.21395	1.569917
1.21519	1.569906
1.21642	1.569894
1.21766	1.569883
1.2189	1.569871
1.22014	1.56986
1.22138	1.569848
1.22262	1.569837
1.22386	1.569825
1.22511	1.569814
1.22635	1.569803
1.2276	1.569791
1.22885	1.56978
1.2301	1.569769
1.23135	1.569758
1.2326	1.569747
1.23385	1.569735
1.23511	1.569724
1.23636	1.569713
1.23762	1.569702
1.23888	1.569691
1.24014	1.56968
1.2414	1.569669
1.24266	1.569658
1.24392	1.569647
1.24519	1.569636
1.24645	1.569625
1.24772	1.569615
1.24899	1.569604
1.25026	1.569593
1.25153	1.569582
1.2528	1.569571
1.25408	1.569561
1.25535	1.56955
1.25663	1.569539
1.25791	1.569529
1.25919	1.569518
1.26047	1.569507
1.26175	1.569497
1.26303	1.569486
1.26431	1.569476
1.2656	1.569465
1.26689	1.569455
1.26817	1.569445
1.26946	1.569434
1.27075	1.569424
1.27205	1.569413
1.27334	1.569403
1.27463	1.569393
1.27593	1.569383
1.27723	1.569372
1.27853	1.569362
1.27983	1.569352
1.28113	1.569342
1.28243	1.569332
1.28373	1.569322
1.28504	1.569312
1.28635	1.569301
1.28765	1.569291
1.28896	1.569281
1.29027	1.569271
1.29159	1.569262
1.2929	1.569252
1.29421	1.569242
1.29553	1.569232
1.29685	1.569222
1.29816	1.569212
1.29948	1.569202
1.30081	1.569193
1.30213	1.569183
1.30345	1.569173
1.30478	1.569163
1.3061	1.569154
1.30743	1.569144
1.30876	1.569135
1.31009	1.569125
1.31142	1.569115
1.31276	1.569106
1.31409	1.569096
1.31543	1.569087
1.31677	1.569077
1.3181	1.569068
1.31944	1.569059
1.32079	1.569049
1.32213	1.56904
1.32347	1.56903
1.32482	1.569021
1.32617	1.569012
1.32751	1.569003
1.32886	1.568993
1.33021	1.568984
1.33157	1.568975
1.33292	1.568966
1.33428	1.568957
1.33563	1.568947
1.33699	1.568938
1.33835	1.568929
1.33971	1.56892
1.34107	1.568911
1.34244	1.568902
1.3438	1.568893
1.34517	1.568884
1.34654	1.568875
1.3479	1.568867
1.34927	1.568858
1.35065	1.568849
1.35202	1.56884
1.35339	1.568831
1.35477	1.568822
1.35615	1.568814
1.35753	1.568805
1.35891	1.568796
1.36029	1.568788
1.36167	1.568779
1.36306	1.56877
1.36444	1.568762
1.36583	1.568753
1.36722	1.568745
1.36861	1.568736
1.37	1.568727
1.37139	1.568719
1.37279	1.568711
1.37418	1.568702
1.37558	1.568694
1.37698	1.568685
1.37838	1.568677
1.37978	1.568669
1.38118	1.56866
1.38259	1.568652
1.38399	1.568644
1.3854	1.568635
1.38681	1.568627
1.38822	1.568619
1.38963	1.568611
1.39104	1.568603
1.39246	1.568594
1.39387	1.568586
1.39529	1.568578
1.39671	1.56857
1.39813	1.568562
1.39955	1.568554
1.40097	1.568546
1.4024	1.568538
1.40382	1.56853
1.40525	1.568522
1.40668	1.568514
1.40811	1.568506
1.40954	1.568499
1.41097	1.568491
1.41241	1.568483
1.41384	1.568475
1.41528	1.568467
1.41672	1.56846
1.41816	1.568452
1.4196	1.568444
1.42105	1.568437
1.42249	1.568429
1.42394	1.568421
1.42539	1.568414
1.42683	1.568406
1.42828	1.568398
1.42974	1.568391
1.43119	1.568383
1.43265	1.568376
1.4341	1.568368
1.43556	1.568361
1.43702	1.568354
1.43848	1.568346
1.43994	1.568339
1.44141	1.568331
1.44287	1.568324
1.44434	1.568317
1.44581	1.568309
1.44728	1.568302
1.44875	1.568295
1.45022	1.568288
1.4517	1.56828
1.45317	1.568273
1.45465	1.568266
1.45613	1.568259
1.45761	1.568252
1.45909	1.568245
1.46058	1.568238
1.46206	1.56823
1.46355	1.568223
1.46504	1.568216
1.46653	1.568209
1.46802	1.568202
1.46951	1.568195
1.471	1.568189
1.4725	1.568182
1.474	1.568175
1.47549	1.568168
1.47699	1.568161
1.4785	1.568154
1.48	1.568147
1.4815	1.568141
1.48301	1.568134
1.48452	1.568127
1.48603	1.56812
1.48754	1.568114
1.48905	1.568107
1.49056	1.5681
1.49208	1.568094
1.4936	1.568087
1.49512	1.56808
1.49664	1.568074
1.49816	1.568067
1.49968	1.568061
1.50121	1.568054
1.50273	1.568048
1.50426	1.568041
1.50579	1.568035
1.50732	1.568028
1.50885	1.568022
1.51039	1.568016
1.51192	1.568009
1.51346	1.568003
1.515	1.567997
1.51654	1.56799
1.51808	1.567984
1.51962	1.567978
1.52117	1.567971
1.52272	1.567965
1.52426	1.567959
1.52581	1.567953
1.52736	1.567947
1.52892	1.567941
1.53047	1.567934
1.53203	1.567928
1.53359	1.567922
1.53515	1.567916
1.53671	1.56791
1.53827	1.567904
1.53983	1.567898
1.5414	1.567892
1.54296	1.567886
1.54453	1.56788
1.5461	1.567874
1.54768	1.567868
1.54925	1.567863
1.55082	1.567857
1.5524	1.567851
1.55398	1.567845
1.55556	1.567839
1.55714	1.567834
1.55872	1.567828
1.56031	1.567822
1.5619	1.567816
1.56348	1.567811
1.56507	1.567805
1.56666	1.567799
1.56826	1.567794
1.56985	1.567788
1.57145	1.567782
1.57305	1.567777
1.57465	1.567771
1.57625	1.567766
1.57785	1.56776
1.57945	1.567755
1.58106	1.567749
1.58267	1.567744
1.58428	1.567738
1.58589	1.567733
1.5875	1.567728
1.58911	1.567722
1.59073	1.567717
1.59235	1.567711
1.59396	1.567706
1.59559	1.567701
1.59721	1.567696
1.59883	1.56769
1.60046	1.567685
1.60208	1.56768
1.60371	1.567675
1.60534	1.567669
1.60698	1.567664
1.60861	1.567659
1.61025	1.567654
1.61188	1.567649
1.61352	1.567644
1.61516	1.567639
1.6168	1.567634
1.61845	1.567629
1.62009	1.567624
1.62174	1.567619
1.62339	1.567614
1.62504	1.567609
1.62669	1.567604
1.62835	1.567599
1.63	1.567594
1.63166	1.567589
1.63332	1.567584
1.63498	1.567579
1.63664	1.567574
1.6383	1.56757
1.63997	1.567565
1.64164	1.56756
1.64331	1.567555
1.64498	1.567551
1.64665	1.567546
1.64832	1.567541
1.65	1.567537

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: —

(C₈H₈)_n (Polystyrene, PS): all datasets

About (C8H8)n (Polystyrene, PS)

Styrene (C₈H₈) is a colorless to yellowish organic compound that exists as a liquid with a distinctive sweet smell, though its odor can be sharp and unpleasant in higher concentrations. It is an essential monomer used in the production of polystyrene, a versatile plastic. Styrene polymerizes readily; this property has led to its widespread use in producing a variety of polymer materials. Styrene can be found in various consumer products, such as food containers and packaging materials. In addition to its role in plastics, styrene's refractive properties are of interest in the optical domain. Prolonged exposure to its vapors should be avoided as it is considered a potential human carcinogen and can affect the central nervous system. Chemical formula: C₆H₅CH=CH₂

More about (C8H8)n (Polystyrene, PS) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/organic/(C8H8)n - polystyrene/nk/Nyakuchena.yml
ID: ds_3221299c87da
API: /v1/datasets/ds_3221299c87da

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