Optical constants

Refractive index of C₁₂H₁₄O₄ (Diethyl phthalate, DEP)

Querry 1987: Near-infrared; n,k 0.81–2.5 µm

Data: tabulated nk
Range: 0.8095–2.499 µm
Points: 170
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.49695
Extinction coefficient k: 5.95000e-06

Permittivity ε₁: 2.24086
Permittivity ε₂: 1.78137e-05

Absorption coefficient α: 0.526549 cm⁻¹
Penetration depth δ = λ/(2πk): 3.79832e+07 nm

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

Group index n_g: 1.63895
Group velocity dispersion: — fs²/mm

Dispersion parameter D: — ps/(nm·km)
Photon energy: 0.873128 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: Near-infrared; n,k 0.81–2.5 µm
c12h14o4 = ls.fetch_refractiveindex("organic", "diethyl_phthalate", "Querry-NIR", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c12h14o4.range_nm)  # (809.5, 2499.5) nm
eps = c12h14o4.eps([1420])  # 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_9070b48c2a61/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-nir).

# ... 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=810, 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.

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

170 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: Near-infrared; n,k 0.81–2.5 µm: n and k versus wavelength
λ (µm)	n	k
0.8095	1.499	0.0
0.8195	1.499	0.0
0.8295	1.499	0.0
0.8395	1.499	0.0
0.8495	1.499	0.0
0.8595	1.499	0.0
0.8695	1.499	0.0
0.8795	1.498	0.0
0.8895	1.498	0.0
0.8995	1.498	1e-06
0.9095	1.498	1e-06
0.9195	1.498	0.0
0.9295	1.498	0.0
0.9395	1.498	0.0
0.9495	1.498	0.0
0.9595	1.498	0.0
0.9695	1.498	0.0
0.9795	1.498	0.0
0.9895	1.498	0.0
0.9995	1.498	1e-06
1.0095	1.498	1e-06
1.0195	1.498	1e-06
1.0295	1.498	1e-06
1.0395	1.498	1e-06
1.0495	1.498	0.0
1.0595	1.498	0.0
1.0695	1.498	0.0
1.0795	1.498	0.0
1.0895	1.498	1e-06
1.0995	1.498	1e-06
1.1095	1.498	1e-06
1.1195	1.498	3e-06
1.1295	1.498	6e-06
1.1395	1.498	7e-06
1.1495	1.497	4e-06
1.1595	1.497	5e-06
1.1695	1.497	7e-06
1.1795	1.497	1e-05
1.1895	1.497	6e-06
1.1995	1.497	3e-06
1.2095	1.497	2e-06
1.2195	1.497	1e-06
1.2295	1.497	1e-06
1.2395	1.497	1e-06
1.2495	1.497	1e-06
1.2595	1.497	1e-06
1.2695	1.497	1e-06
1.2795	1.497	1e-06
1.2895	1.497	1e-06
1.2995	1.497	1e-06
1.3095	1.497	1e-06
1.3195	1.497	1e-06
1.3295	1.497	1e-06
1.3395	1.497	2e-06
1.3495	1.497	5e-06
1.3595	1.497	7e-06
1.3695	1.497	9e-06
1.3795	1.497	1e-05
1.3895	1.497	1e-05
1.3995	1.497	9e-06
1.4095	1.497	7e-06
1.4195	1.497	6e-06
1.4295	1.496	5e-06
1.4395	1.496	4e-06
1.4495	1.496	4e-06
1.4595	1.496	4e-06
1.4695	1.496	3e-06
1.4795	1.496	3e-06
1.4895	1.496	2e-06
1.4995	1.496	2e-06
1.5095	1.496	2e-06
1.5195	1.496	2e-06
1.5295	1.496	1e-06
1.5395	1.496	1e-06
1.5495	1.496	1e-06
1.5595	1.496	2e-06
1.5695	1.496	2e-06
1.5795	1.496	2e-06
1.5895	1.496	3e-06
1.5995	1.496	5e-06
1.6095	1.496	6e-06
1.6195	1.496	1.1e-05
1.6295	1.496	1.6e-05
1.6395	1.496	1.8e-05
1.6495	1.496	4e-05
1.6595	1.496	9.8e-05
1.6695	1.496	0.000112
1.6795	1.496	0.000137
1.6895	1.496	0.000102
1.6995	1.496	5.2e-05
1.7095	1.495	5.6e-05
1.7195	1.495	7.8e-05
1.7295	1.495	7.3e-05
1.7395	1.495	4.4e-05
1.7495	1.495	3.8e-05
1.7595	1.495	4.4e-05
1.7695	1.495	2.9e-05
1.7795	1.495	2.4e-05
1.7895	1.495	2.7e-05
1.7995	1.495	2.7e-05
1.8095	1.495	2.4e-05
1.8195	1.495	2.2e-05
1.8295	1.495	2.1e-05
1.8395	1.495	1.9e-05
1.8495	1.495	1.6e-05
1.8595	1.495	1.6e-05
1.8695	1.495	1.6e-05
1.8795	1.495	1.7e-05
1.8895	1.495	2e-05
1.8995	1.495	2.7e-05
1.9095	1.495	2.7e-05
1.9195	1.495	2.1e-05
1.9295	1.495	2.2e-05
1.9395	1.494	2.9e-05
1.9495	1.494	3.2e-05
1.9595	1.494	2.6e-05
1.9695	1.494	1.9e-05
1.9795	1.494	1.8e-05
1.9895	1.494	2e-05
1.9995	1.494	1.9e-05
2.0095	1.494	1.9e-05
2.0195	1.494	2e-05
2.0295	1.494	2.2e-05
2.0395	1.494	2.4e-05
2.0495	1.494	2.5e-05
2.0595	1.494	2.8e-05
2.0695	1.494	3.5e-05
2.0795	1.494	4.7e-05
2.0895	1.494	4.6e-05
2.0995	1.494	4.7e-05
2.1095	1.494	6.2e-05
2.1195	1.494	8.6e-05
2.1295	1.493	0.000108
2.1395	1.493	0.000197
2.1495	1.493	0.000128
2.1595	1.493	0.000152
2.1695	1.493	0.000119
2.1795	1.493	8.6e-05
2.1895	1.493	0.000109
2.1995	1.493	9.8e-05
2.2095	1.493	0.000119
2.2195	1.493	0.000119
2.2295	1.493	0.00017
2.2395	1.493	0.00027
2.2495	1.493	0.000508
2.2595	1.493	0.000799
2.2695	1.493	0.000515
2.2795	1.493	0.000394
2.2895	1.493	0.000507
2.2995	1.493	0.000691
2.3095	1.493	0.000605
2.3195	1.493	0.000419
2.3295	1.493	0.000441
2.3395	1.493	0.000473
2.3495	1.493	0.000465
2.3595	1.493	0.000389
2.3695	1.493	0.000339
2.3795	1.492	0.000351
2.3895	1.492	0.000428
2.3995	1.492	0.000487
2.4095	1.492	0.000628
2.4195	1.492	0.000559
2.4295	1.492	0.000575
2.4395	1.492	0.000639
2.4495	1.492	0.000585
2.4595	1.492	0.0005
2.4695	1.492	0.000437
2.4795	1.492	0.000393
2.4895	1.492	0.000324
2.4995	1.492	0.00026

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-NIR.yml
ID: ds_9070b48c2a61
API: /v1/datasets/ds_9070b48c2a61

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