Optical constants

Refractive index of C₁₂H₁₄O₄ (Diethyl phthalate, DEP)

Querry 1987: Infrared; n,k 2.5–56 µm

Data: tabulated nk
Range: 2.5–55.56 µm
Points: 381
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.51676
Extinction coefficient k: 0.0159764

Permittivity ε₁: 2.30029
Permittivity ε₂: 0.0484647

Absorption coefficient α: 170.141 cm⁻¹
Penetration depth δ = λ/(2πk): 117550 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: 0.0214133 µm⁻¹

Group index n_g: 1.26408
Group velocity dispersion: — fs²/mm

Dispersion parameter D: — ps/(nm·km)
Photon energy: 0.105071 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

# C12H14O4 (Diethyl phthalate, DEP): Querry 1987: Infrared; n,k 2.5–56 µm
c12h14o4 = ls.fetch_refractiveindex("organic", "diethyl_phthalate", "Querry-IR", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c12h14o4.range_nm)  # (2500, 55555.6) nm
eps = c12h14o4.eps([11800])  # 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_26cae02a8160/lightsmith"
c12h14o4 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(c12h14o4.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (diethyl-phthalate/querry-1987-ir).

# ... load c12h14o4 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=c12h14o4)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=2500, stop_nm=55560, 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.

References

M. R. Querry. Optical constants of minerals and other materials from the millimeter to the ultraviolet. Contractor Report CRDEC-CR-88009 (1987)

Cite

M. R. Querry. Optical constants of minerals and other materials from the millimeter to the ultraviolet. Contractor Report CRDEC-CR-88009 (1987); Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

382 rows as published

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

C12H14O4 (Diethyl phthalate, DEP), Querry 1987: Infrared; n,k 2.5–56 µm: n and k versus wavelength
λ (µm)	n	k
2.5	1.471	0.0
2.5063	1.469	0.0
2.5126	1.466	0.0
2.5189	1.465	0.0
2.5253	1.466	0.0
2.5316	1.467	0.0
2.5381	1.468	0.0
2.5445	1.468	0.0
2.551	1.468	0.0
2.5575	1.469	0.0
2.5641	1.469	0.0
2.5707	1.47	0.0
2.5773	1.47	0.0
2.564	1.469	0.0
2.5907	1.468	0.0
2.5974	1.465	0.0
2.6042	1.465	0.0
2.611	1.466	0.0
2.6178	1.468	0.0
2.6247	1.469	0.0
2.6316	1.467	0.0
2.6385	1.466	0.0
2.6455	1.466	0.0
2.6525	1.469	0.0
2.6596	1.469	0.0
2.6667	1.467	0.0
2.6738	1.468	0.0
2.681	1.469	0.0
2.6882	1.469	0.0
2.6954	1.468	0.0
2.7027	1.468	0.0
2.71	1.468	0.0
2.7174	1.466	0.0
2.7248	1.468	0.0
2.7322	1.467	0.0
2.7397	1.467	0.0
2.7473	1.466	0.0
2.7548	1.468	0.001
2.7624	1.469	0.0
2.7701	1.469	0.0
2.7778	1.469	0.0
2.7855	1.468	0.0
2.7933	1.468	0.0
2.8011	1.467	0.0
2.809	1.467	0.0
2.8169	1.467	0.0
2.8249	1.466	0.0
2.8329	1.464	0.0
2.8409	1.465	0.0
2.849	1.466	0.0
2.8571	1.466	0.0
2.8653	1.466	0.0
2.8736	1.466	0.0
2.8818	1.466	0.0
2.8902	1.465	0.0
2.8986	1.465	0.0
2.907	1.466	0.0
2.9155	1.464	0.0
2.924	1.465	0.0
2.9326	1.465	0.0
2.9412	1.466	0.0
2.9499	1.466	0.0
2.9586	1.465	0.0
2.9674	1.464	0.0
2.9762	1.466	0.0
2.9851	1.465	0.0
2.994	1.465	0.0
3.003	1.464	0.0
3.012	1.463	0.0
3.0211	1.463	0.0
3.0303	1.463	0.0
3.0395	1.464	0.0
3.0488	1.464	0.0
3.0581	1.463	0.0
3.0675	1.463	0.0
3.0769	1.464	0.0
3.0864	1.463	0.0
3.096	1.461	0.0
3.1056	1.46	0.0
3.1153	1.461	0.001
3.125	1.462	0.0
3.1348	1.463	0.0
3.1447	1.463	0.0
3.1646	1.462	0.0
3.1746	1.462	0.0
3.1847	1.459	0.0
3.1949	1.459	0.0
3.2051	1.46	0.0
3.2154	1.458	0.0
3.2258	1.456	0.0
3.2362	1.456	0.001
3.2468	1.458	0.003
3.2573	1.456	0.002
3.268	1.459	0.002
3.2787	1.46	0.001
3.2895	1.451	0.0
3.3003	1.454	0.001
3.3113	1.45	0.002
3.3223	1.448	0.006
3.3333	1.445	0.015
3.3445	1.449	0.024
3.3557	1.461	0.03
3.367	1.474	0.018
3.3784	1.469	0.013
3.3898	1.473	0.01
3.4014	1.471	0.009
3.413	1.473	0.012
3.4247	1.469	0.007
3.4364	1.46	0.003
3.4483	1.475	0.01
3.4602	1.473	0.005
3.4722	1.466	0.003
3.4843	1.468	0.005
3.4965	1.473	0.003
3.5086	1.47	0.0
3.5221	1.467	0.0
3.5336	1.467	0.001
3.5462	1.468	0.0
3.5587	1.467	0.0
3.5714	1.464	0.0
3.5842	1.461	0.0
3.5976	1.462	0.001
3.6101	1.464	0.001
3.6232	1.464	0.0
3.6364	1.464	0.0
3.6496	1.465	0.0
3.663	1.465	0.0
3.6765	1.463	0.0
3.7037	1.462	0.0
3.69	1.462	0.0
3.7175	1.462	0.0
3.7313	1.462	0.0
3.7453	1.462	0.0
3.7594	1.46	0.0
3.7736	1.458	0.0
3.7879	1.456	0.001
3.8023	1.46	0.001
3.8168	1.461	0.0
3.8314	1.46	0.0
3.8462	1.46	0.0
3.861	1.459	0.0
3.876	1.459	0.0
3.8911	1.46	0.0
3.9063	1.458	0.0
3.9216	1.458	0.0
3.937	1.458	0.0
3.9526	1.459	0.0
3.9683	1.458	0.0
3.9841	1.457	0.0
4.0	1.458	0.0
4.0161	1.456	0.0
4.0323	1.456	0.0
4.0486	1.456	0.0
4.065	1.457	0.0
4.0816	1.456	0.0
4.0984	1.455	0.0
4.1152	1.454	0.0
4.1322	1.456	0.0
4.1494	1.456	0.0
4.1667	1.455	0.0
4.1841	1.453	0.0
4.2017	1.453	0.0
4.2194	1.452	0.0
4.2373	1.452	0.002
4.2553	1.453	0.001
4.2735	1.453	0.002
4.2918	1.454	0.001
4.3103	1.452	0.001
4.329	1.453	0.0
4.3478	1.452	0.0
4.3668	1.452	0.001
4.386	1.453	0.001
4.4053	1.453	0.0
4.4248	1.452	0.0
4.4444	1.45	0.0
4.4643	1.45	0.001
4.4643	1.45	0.001
4.5045	1.45	0.0
4.5249	1.449	0.0
4.5455	1.448	0.0
4.5662	1.448	0.001
4.5872	1.448	0.0
4.6083	1.448	0.0
4.6296	1.446	0.0
4.6512	1.446	0.001
4.6729	1.446	0.001
4.6948	1.445	0.001
4.717	1.444	0.002
4.7393	1.444	0.002
4.7619	1.444	0.002
4.7847	1.444	0.001
4.8077	1.444	0.0
4.8309	1.441	0.0
4.8544	1.44	0.002
4.878	1.44	0.003
4.902	1.44	0.003
4.9261	1.438	0.003
4.9505	1.438	0.003
4.9751	1.436	0.004
5.0	1.436	0.006
5.0251	1.437	0.007
5.0505	1.439	0.006
5.0761	1.438	0.004
5.102	1.436	0.003
5.1282	1.435	0.003
5.1546	1.433	0.003
5.1813	1.432	0.003
5.2083	1.43	0.002
5.2356	1.428	0.003
5.2632	1.427	0.003
5.291	1.425	0.002
5.3191	1.421	0.003
5.3476	1.421	0.004
5.3763	1.416	0.003
5.4054	1.413	0.006
5.4348	1.412	0.003
5.4645	1.406	0.002
5.4945	1.402	0.004
5.5249	1.394	0.005
5.5556	1.387	0.002
5.5866	1.372	0.006
5.618	1.357	0.009
5.6497	1.336	0.017
5.6818	1.303	0.028
5.7143	1.221	0.074
5.7471	1.185	0.26
5.7803	1.393	0.434
5.814	1.663	0.346
5.848	1.687	0.106
5.8824	1.6	0.035
5.9172	1.556	0.024
5.9524	1.533	0.015
5.988	1.518	0.009
6.0241	1.503	0.005
6.0606	1.493	0.006
6.0976	1.482	0.003
6.135	1.477	0.004
6.1728	1.465	0.004
6.2112	1.457	0.006
6.25	1.461	0.028
6.2893	1.468	0.008
6.3291	1.464	0.026
6.3694	1.467	0.006
6.4103	1.458	0.005
6.4516	1.454	0.001
6.4935	1.447	0.004
6.5359	1.443	0.005
6.5789	1.436	0.002
6.6225	1.432	0.006
6.6667	1.42	0.005
6.7114	1.411	0.023
6.7568	1.414	0.026
6.8027	1.422	0.034
6.8493	1.425	0.027
6.8966	1.418	0.046
6.9444	1.45	0.027
6.993	1.432	0.009
7.0423	1.413	0.008
7.0922	1.402	0.009
7.1429	1.389	0.02
7.1942	1.392	0.038
7.2464	1.38	0.023
7.2993	1.343	0.089
7.3529	1.434	0.034
7.4074	1.383	0.01
7.4627	1.346	0.015
7.5188	1.307	0.017
7.5758	1.249	0.042
7.6336	1.15	0.106
7.6923	1.119	0.327
7.7519	1.3	0.52
7.8125	1.549	0.503
7.874	1.699	0.345
7.9365	1.695	0.235
8.0	1.698	0.139
8.0645	1.675	0.074
8.1301	1.613	0.028
8.1967	1.577	0.018
8.2645	1.544	0.013
8.3333	1.517	0.015
8.4034	1.492	0.018
8.4746	1.455	0.034
8.547	1.476	0.059
8.6207	1.452	0.04
8.6957	1.387	0.067
8.7719	1.388	0.185
8.8496	1.476	0.231
8.928	1.581	0.228
9.009	1.634	0.13
9.0909	1.579	0.062
9.1743	1.535	0.053
9.2593	1.443	0.129
9.3458	1.662	0.219
9.434	1.646	0.036
9.5238	1.565	0.021
9.6154	1.579	0.103
9.7087	1.57	0.024
9.8039	1.554	0.07
9.901	1.6	0.057
10.0	1.596	0.019
10.101	1.577	0.004
10.2041	1.562	0.002
10.3093	1.549	0.002
10.4167	1.549	0.005
10.5263	1.544	0.0
10.6383	1.532	0.0
10.7527	1.526	0.0
10.8696	1.523	0.0
10.989	1.518	0.0
11.1111	1.511	0.001
11.236	1.508	0.006
11.3636	1.498	0.005
11.4943	1.493	0.028
11.6279	1.514	0.031
11.7647	1.516	0.019
11.9048	1.519	0.007
12.0482	1.505	0.001
12.1951	1.494	0.003
12.3457	1.479	0.003
12.5	1.468	0.02
12.6582	1.468	0.038
12.8205	1.478	0.045
12.967	1.474	0.043
13.1579	1.446	0.059
13.3333	1.444	0.157
13.5135	1.617	0.155
13.6986	1.599	0.033
13.8889	1.558	0.017
14.0845	1.526	0.041
14.2857	1.567	0.042
14.4928	1.572	0.023
14.7059	1.553	0.001
14.9254	1.538	0.0
15.1515	1.528	0.002
15.3846	1.536	0.023
15.625	1.535	0.003
15.873	1.534	0.003
16.129	1.527	0.001
16.3934	1.525	0.0
16.6667	1.526	0.0
16.9492	1.515	0.0
17.2414	1.512	0.0
17.5439	1.503	0.007
17.8571	1.521	0.024
18.1818	1.524	0.005
18.5185	1.517	0.003
18.8679	1.516	0.003
19.2308	1.518	0.003
19.6078	1.513	0.0
20.0	1.512	0.0
20.4082	1.511	0.0
20.8333	1.506	0.0
21.2766	1.507	0.002
21.7391	1.501	0.002
22.2222	1.5	0.004
22.7273	1.5	0.003
23.2558	1.493	0.003
23.8095	1.487	0.011
24.3902	1.49	0.024
25.0	1.501	0.023
25.641	1.507	0.021
26.3158	1.502	0.016
27.027	1.495	0.023
27.7778	1.498	0.035
28.5714	1.51	0.043
29.4118	1.524	0.04
30.303	1.532	0.032
31.25	1.534	0.023
32.2581	1.534	0.017
33.3333	1.534	0.012
34.4828	1.532	0.008
35.7143	1.531	0.005
37.037	1.529	0.003
38.4615	1.529	0.0
40.0	1.528	0.0
41.6667	1.524	0.0
43.4783	1.525	0.0
45.4545	1.527	0.0
47.619	1.524	0.0
50.0	1.52	0.0
52.6316	1.51	0.0
55.5556	1.501	0.0

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: —

C₁₂H₁₄O₄ (Diethyl phthalate, DEP): all datasets

About C12H14O4 (Diethyl phthalate, DEP)

Diethyl phthalate (C₁₂H₁₄O₄), often abbreviated as DEP, is a clear and odorless liquid commonly employed as a solvent and plasticizer. It is used to make plastics more flexible and is also found in a variety of personal care products, such as perfumes, lotions, and cosmetics, due to its ability to help products retain scents and extend their shelf life. Additionally, DEP can be found in some food packaging materials. It's worth noting that concerns have been raised about the potential health impacts of phthalates, leading to extensive research and regulatory review in numerous jurisdictions.

More about C12H14O4 (Diethyl phthalate, DEP) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/organic/C12H14O4 - diethyl phthalate/nk/Querry-IR.yml
ID: ds_26cae02a8160
API: /v1/datasets/ds_26cae02a8160

Plot