Optical constants

Refractive index of EVASKY S88

Vogt et al. 2016: n,k 0.25–2.5 µm

Data: tabulated nk
Range: 0.25–2.5 µm
Points: 226
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.49124
Extinction coefficient k: 5.75320e-07

Permittivity ε₁: 2.2238
Permittivity ε₂: 1.71588e-06

Absorption coefficient α: 0.123038 cm⁻¹
Penetration depth δ = λ/(2πk): 1.62552e+08 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.1 µm⁻¹

Group index n_g: 1.55
Group velocity dispersion: — fs²/mm

Dispersion parameter D: — 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

# EVASKY S88: Vogt et al. 2016: n,k 0.25–2.5 µm
evasky_s88 = ls.fetch_refractiveindex("other", "EVASKY_S88", "Vogt", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(evasky_s88.range_nm)  # (250, 2500) nm
eps = evasky_s88.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_60052b19c354/lightsmith"
evasky_s88 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(evasky_s88.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (evasky-s88/vogt-2016).

# ... load evasky_s88 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=evasky_s88)],
    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"]).

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.

Comments and conditions

Conventional ethylene-vinyl acetate (EVA) with high UV absorption. Room temperature.

References

1) M. R. Vogt, H. Schulte-Huxel, D. Hinken, H. Holst, M. Winter, S. Blankemeyer, R. Witteck, M. Köntges, K. Bothe, R. Brendel. Optical constants of UV transparent EVA and the impact on the PV module output power under realistic illumination. Energy Procedia 92, 523-530 (2016)
2) M. R. Vogt. Development of physical models for the simulation of optical properties of solar cell modules. PhD. Thesis (2015)

doi:10.1016/j.egypro.2016.07.136 Optical Constants of UV Transparent EVA and the Impact on the PV Module Output Power under Realistic Irradiation, Energy Procedia (2016)

Cite

Malte R. Vogt et al.. Optical Constants of UV Transparent EVA and the Impact on the PV Module Output Power under Realistic Irradiation. Energy Procedia, 92, 523-530 (2016), doi:10.1016/j.egypro.2016.07.136; M. R. Vogt. Development of physical models for the simulation of optical properties of solar cell modules. PhD. Thesis (2015); Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

226 rows as published

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

EVASKY S88, Vogt et al. 2016: n,k 0.25–2.5 µm: n and k versus wavelength
λ (µm)	n	k
0.25	1.562	0.000771
0.26	1.555	0.00189
0.27	1.549	0.000592
0.28	1.543	0.00142
0.29	1.538	0.00216
0.3	1.533	0.00314
0.31	1.529	0.0034
0.32	1.525	0.00303
0.33	1.522	0.00105
0.34	1.519	0.00456
0.35	1.517	0.00187
0.36	1.514	0.00011
0.37	1.512	4.45e-05
0.38	1.51	1.65e-05
0.39	1.508	6.61e-06
0.4	1.507	2.62e-06
0.41	1.505	1.65e-06
0.42	1.504	1.28e-06
0.43	1.503	1.11e-06
0.44	1.502	1.02e-06
0.45	1.501	9.66e-07
0.46	1.5	9.2e-07
0.47	1.499	8.8e-07
0.48	1.498	8.43e-07
0.49	1.497	8.11e-07
0.5	1.496	7.79e-07
0.51	1.496	7.49e-07
0.52	1.495	7.24e-07
0.53	1.494	6.98e-07
0.54	1.494	6.74e-07
0.55	1.493	6.52e-07
0.56	1.493	6.29e-07
0.57	1.492	6.1e-07
0.58	1.492	5.89e-07
0.59	1.491	5.71e-07
0.6	1.491	5.52e-07
0.61	1.49	5.37e-07
0.62	1.49	5.19e-07
0.63	1.49	5.03e-07
0.64	1.489	4.91e-07
0.65	1.489	4.79e-07
0.66	1.489	4.6e-07
0.67	1.488	4.42e-07
0.68	1.488	4.31e-07
0.69	1.488	4.18e-07
0.7	1.488	4.08e-07
0.71	1.487	3.98e-07
0.72	1.487	3.9e-07
0.73	1.487	3.85e-07
0.74	1.487	3.88e-07
0.75	1.487	3.97e-07
0.76	1.486	3.99e-07
0.77	1.486	3.78e-07
0.78	1.486	3.47e-07
0.79	1.486	3.27e-07
0.8	1.486	3.18e-07
0.81	1.486	3.18e-07
0.82	1.485	3.19e-07
0.83	1.485	3.21e-07
0.84	1.485	3.18e-07
0.85	1.485	3.08e-07
0.86	1.485	3e-07
0.87	1.485	3.05e-07
0.88	1.485	3.3e-07
0.89	1.484	3.91e-07
0.9	1.484	4.84e-07
0.91	1.484	6.49e-07
0.92	1.484	9.1e-07
0.93	1.484	1.1e-06
0.94	1.484	9.66e-07
0.95	1.484	6.1e-07
0.96	1.484	3.51e-07
0.97	1.484	2.98e-07
0.98	1.483	2.84e-07
0.99	1.483	3.06e-07
1.0	1.483	3.71e-07
1.01	1.483	4.59e-07
1.02	1.483	5.51e-07
1.03	1.483	6.48e-07
1.04	1.483	7.03e-07
1.05	1.483	6.73e-07
1.06	1.483	5.79e-07
1.07	1.483	4.9e-07
1.08	1.483	4.19e-07
1.09	1.483	3.77e-07
1.1	1.483	3.65e-07
1.11	1.483	3.93e-07
1.12	1.482	4.77e-07
1.13	1.482	6.69e-07
1.14	1.482	1.12e-06
1.15	1.482	1.97e-06
1.16	1.482	3.22e-06
1.17	1.482	4.66e-06
1.18	1.482	6.33e-06
1.19	1.482	8.87e-06
1.2	1.482	1.24e-05
1.21	1.482	1.51e-05
1.22	1.482	1.27e-05
1.23	1.482	8.18e-06
1.24	1.482	4.87e-06
1.25	1.482	3.18e-06
1.26	1.482	2.27e-06
1.27	1.482	1.78e-06
1.28	1.482	1.51e-06
1.29	1.482	1.33e-06
1.3	1.482	1.2e-06
1.31	1.482	1.08e-06
1.32	1.482	9.99e-07
1.33	1.482	1.04e-06
1.34	1.481	1.3e-06
1.35	1.481	1.75e-06
1.36	1.481	2.63e-06
1.37	1.481	4.36e-06
1.38	1.481	7.13e-06
1.39	1.481	9.89e-06
1.4	1.481	1.1e-05
1.41	1.481	1.14e-05
1.42	1.481	1.16e-05
1.43	1.481	1.1e-05
1.44	1.481	9.69e-06
1.45	1.481	8.24e-06
1.46	1.481	6.84e-06
1.47	1.481	5.56e-06
1.48	1.481	4.49e-06
1.49	1.481	3.74e-06
1.5	1.481	3.27e-06
1.51	1.481	3.06e-06
1.52	1.481	3.06e-06
1.53	1.481	3.15e-06
1.54	1.481	3.1e-06
1.55	1.481	2.74e-06
1.56	1.481	2.39e-06
1.57	1.481	2.17e-06
1.58	1.481	2.08e-06
1.59	1.481	2.1e-06
1.6	1.481	2.23e-06
1.61	1.481	2.47e-06
1.62	1.481	2.9e-06
1.63	1.481	3.65e-06
1.64	1.481	4.77e-06
1.65	1.481	6.55e-06
1.66	1.481	9.31e-06
1.67	1.481	1.33e-05
1.68	1.481	1.82e-05
1.69	1.481	2.39e-05
1.7	1.481	3.34e-05
1.71	1.481	5.16e-05
1.72	1.481	8.7e-05
1.73	1.481	9.88e-05
1.74	1.481	8.06e-05
1.75	1.481	7.82e-05
1.76	1.481	7.96e-05
1.77	1.481	6.85e-05
1.78	1.481	5.82e-05
1.79	1.481	5.42e-05
1.8	1.48	5.34e-05
1.81	1.48	5.29e-05
1.82	1.48	5.07e-05
1.83	1.48	4.74e-05
1.84	1.48	4.33e-05
1.85	1.48	3.92e-05
1.86	1.48	3.58e-05
1.87	1.48	3.33e-05
1.88	1.48	3.22e-05
1.89	1.48	3.27e-05
1.9	1.48	3.32e-05
1.91	1.48	3.33e-05
1.92	1.48	3.33e-05
1.93	1.48	3.38e-05
1.94	1.48	3.45e-05
1.95	1.48	3.37e-05
1.96	1.48	3.27e-05
1.97	1.48	3.23e-05
1.98	1.48	3.23e-05
1.99	1.48	3.3e-05
2.0	1.48	3.44e-05
2.01	1.48	3.49e-05
2.02	1.48	3.37e-05
2.03	1.48	3.27e-05
2.04	1.48	3.28e-05
2.05	1.48	3.28e-05
2.06	1.48	3.28e-05
2.07	1.48	3.22e-05
2.08	1.48	3.22e-05
2.09	1.48	3.37e-05
2.1	1.48	3.53e-05
2.11	1.48	3.71e-05
2.12	1.48	3.97e-05
2.13	1.48	4.48e-05
2.14	1.48	4.82e-05
2.15	1.48	4.32e-05
2.16	1.48	3.92e-05
2.17	1.48	3.8e-05
2.18	1.48	3.86e-05
2.19	1.48	3.95e-05
2.2	1.48	4.21e-05
2.21	1.48	4.76e-05
2.22	1.48	5.55e-05
2.23	1.48	6.91e-05
2.24	1.48	8.89e-05
2.25	1.48	0.000157
2.26	1.48	0.000211
2.27	1.48	0.00027
2.28	1.48	0.000359
2.29	1.48	0.000518
2.3	1.48	0.000734
2.31	1.48	0.000812
2.32	1.48	0.000654
2.33	1.48	0.000595
2.34	1.48	0.000669
2.35	1.48	0.000758
2.36	1.48	0.000735
2.37	1.48	0.000706
2.38	1.48	0.000747
2.39	1.48	0.000756
2.4	1.48	0.00075
2.41	1.48	0.000714
2.42	1.48	0.000684
2.43	1.48	0.000663
2.44	1.48	0.000621
2.45	1.48	0.000578
2.46	1.48	0.000533
2.47	1.48	0.000503
2.48	1.48	0.000465
2.49	1.48	0.000445
2.5	1.48	0.000419

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: —

EVASKY S88: all datasets

Vogt et al. 2016: n,k 0.25–2.5 µm n,k 0.25–2.5 µm default

About EVASKY S88

Ethylene-vinyl acetate (C₂H₄)_n(C₄H₆O₂)_m (EVA) is a copolymer composed of ethylene and vinyl acetate. This versatile material is known for its excellent flexibility, resilience, clarity, and resistance to UV radiation. It's softer and more flexible than polyethylene and possesses a lower melting point. EVA's unique properties stem from its varied content of vinyl acetate (typically ranging from 5% to 50%), with higher content increasing its softness and flexibility. This copolymer is widely used in various applications including foam shoe soles, hot melt adhesives, films for packaging, and even toys. Its versatility extends to other specialized uses like solar panel encapsulation and as a component in biomedical devices due to its biocompatibility. EVA is also known for its ease of processing, making it a preferred material for various fabrication methods.

More about EVASKY S88 →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/other/commercial polymers/EVASKY S88/nk/Vogt.yml
ID: ds_60052b19c354
API: /v1/datasets/ds_60052b19c354

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