Optical constants

Refractive index of C₃₂H₄₄N₂O₆ (SQIB)

Funke et al. 2021: n,k(γ) 0.450–0.900 µm

Data: tabulated nk
Range: 0.45–0.9 µm
Points: 400
Optical axis: gamma
Licence: CC0-1.0

Biaxial crystal, axes: gamma

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.06709
Extinction coefficient k: 0.381358

Permittivity ε₁: 0.993254
Permittivity ε₂: 0.81389

Absorption coefficient α: 81557 cm⁻¹
Penetration depth δ = λ/(2πk): 245.227 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -2.82439 µm⁻¹

Group index n_g: 2.72671
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

# C32H44N2O6 (SQIB): Funke et al. 2021: n,k(γ) 0.450–0.900 µm
c32h44n2o6 = ls.fetch_refractiveindex("organic", "SQIB", "Funke-γ", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(c32h44n2o6.range_nm)  # (450, 900) nm
eps = c32h44n2o6.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_29fc00912a37/lightsmith"
c32h44n2o6 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(c32h44n2o6.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (sqib/funke-2021-2).

# ... load c32h44n2o6 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=c32h44n2o6)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=450, stop_nm=900, 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

n_γ, k_γ (b-axis).

Conditions

direction: gamma

References

S. Funke, M. Duwe, F. Balzer, P. H. Thiesen, K. Hingerl, M. Schiek. Determining the dielectric tensor of micro-textured organic thin films by imaging Mueller matrix ellipsometry. J. Phys. Chem. Lett. 12, 3053-3058 (2021) (Numerical data kindly provided by Manuela Schiek)

doi:10.1021/acs.jpclett.1c00317 Determining the Dielectric Tensor of Microtextured Organic Thin Films by Imaging Mueller Matrix Ellipsometry, The Journal of Physical Chemistry Letters (2021)

Cite

Sebastian Funke et al.. Determining the Dielectric Tensor of Microtextured Organic Thin Films by Imaging Mueller Matrix Ellipsometry. The Journal of Physical Chemistry Letters, 12, 3053-3058 (2021), doi:10.1021/acs.jpclett.1c00317; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

400 rows as published

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

C32H44N2O6 (SQIB), Funke et al. 2021: n,k(γ) 0.450–0.900 µm: n and k versus wavelength
λ (µm)	n	k
0.45	1.3977	0.07751
0.451128	1.39587	0.07841
0.452256	1.39402	0.07933
0.453383	1.39214	0.08028
0.454511	1.39025	0.08126
0.455639	1.38834	0.08226
0.456767	1.38642	0.0833
0.457895	1.38447	0.08437
0.459023	1.38251	0.08547
0.46015	1.38053	0.08662
0.461278	1.37854	0.08781
0.462406	1.37653	0.08905
0.463534	1.37451	0.09035
0.464662	1.37249	0.0917
0.465789	1.37047	0.09312
0.466917	1.36845	0.09461
0.468045	1.36644	0.09617
0.469173	1.36446	0.09781
0.470301	1.36252	0.09954
0.471429	1.36063	0.10136
0.472556	1.35882	0.10326
0.473684	1.3571	0.10524
0.474812	1.35551	0.1073
0.47594	1.35407	0.1094
0.477068	1.3528	0.11152
0.478195	1.35173	0.11362
0.479323	1.35086	0.11565
0.480451	1.35018	0.11755
0.481579	1.34966	0.11925
0.482707	1.34926	0.12071
0.483835	1.34891	0.1219
0.484962	1.34853	0.1228
0.48609	1.34804	0.12344
0.487218	1.34739	0.12386
0.488346	1.34652	0.1241
0.489474	1.34542	0.12423
0.490602	1.34408	0.12431
0.491729	1.34251	0.12438
0.492857	1.34075	0.12449
0.493985	1.3388	0.12467
0.495113	1.3367	0.12493
0.496241	1.33448	0.12528
0.497368	1.33215	0.12572
0.498496	1.32974	0.12626
0.499624	1.32725	0.1269
0.500752	1.32471	0.12762
0.50188	1.32213	0.12843
0.503008	1.3195	0.12932
0.504135	1.31684	0.13029
0.505263	1.31415	0.13132
0.506391	1.31144	0.13243
0.507519	1.3087	0.13359
0.508647	1.30595	0.13482
0.509774	1.30317	0.1361
0.510902	1.30037	0.13744
0.51203	1.29756	0.13883
0.513158	1.29473	0.14027
0.514286	1.29187	0.14176
0.515414	1.289	0.1433
0.516541	1.28611	0.14489
0.517669	1.2832	0.14652
0.518797	1.28028	0.1482
0.519925	1.27733	0.14992
0.521053	1.27436	0.15169
0.52218	1.27137	0.1535
0.523308	1.26835	0.15537
0.524436	1.26532	0.15727
0.525564	1.26227	0.15923
0.526692	1.25919	0.16123
0.52782	1.25608	0.16328
0.528947	1.25296	0.16537
0.530075	1.24981	0.16752
0.531203	1.24664	0.16971
0.532331	1.24344	0.17196
0.533459	1.24022	0.17426
0.534586	1.23697	0.17661
0.535714	1.23369	0.17902
0.536842	1.23039	0.18148
0.53797	1.22707	0.184
0.539098	1.22372	0.18658
0.540226	1.22035	0.18922
0.541353	1.21694	0.19192
0.542481	1.21352	0.19468
0.543609	1.21006	0.19751
0.544737	1.20659	0.2004
0.545865	1.20308	0.20336
0.546992	1.19955	0.20639
0.54812	1.196	0.2095
0.549248	1.19243	0.21267
0.550376	1.18882	0.21593
0.551504	1.1852	0.21926
0.552632	1.18155	0.22267
0.553759	1.17789	0.22616
0.554887	1.1742	0.22974
0.556015	1.17049	0.2334
0.557143	1.16676	0.23716
0.558271	1.16301	0.241
0.559399	1.15925	0.24494
0.560526	1.15547	0.24898
0.561654	1.15168	0.25311
0.562782	1.14788	0.25735
0.56391	1.14407	0.26169
0.565038	1.14025	0.26614
0.566165	1.13642	0.2707
0.567293	1.13259	0.27537
0.568421	1.12876	0.28015
0.569549	1.12494	0.28506
0.570677	1.12111	0.29008
0.571805	1.1173	0.29522
0.572932	1.1135	0.30049
0.57406	1.10971	0.30589
0.575188	1.10594	0.31142
0.576316	1.1022	0.31708
0.577444	1.09848	0.32287
0.578571	1.09479	0.3288
0.579699	1.09115	0.33487
0.580827	1.08754	0.34108
0.581955	1.08398	0.34743
0.583083	1.08048	0.35392
0.584211	1.07703	0.36055
0.585338	1.07365	0.36733
0.586466	1.07034	0.37425
0.587594	1.06711	0.38132
0.588722	1.06396	0.38853
0.58985	1.06091	0.39588
0.590977	1.05795	0.40337
0.592105	1.0551	0.411
0.593233	1.05236	0.41877
0.594361	1.04975	0.42668
0.595489	1.04726	0.43471
0.596617	1.0449	0.44287
0.597744	1.04269	0.45115
0.598872	1.04062	0.45955
0.6	1.03871	0.46806
0.601128	1.03696	0.47667
0.602256	1.03538	0.48538
0.603383	1.03397	0.49418
0.604511	1.03274	0.50306
0.605639	1.0317	0.51201
0.606767	1.03084	0.52102
0.607895	1.03018	0.53009
0.609023	1.02971	0.5392
0.61015	1.02944	0.54834
0.611278	1.02936	0.5575
0.612406	1.02949	0.56666
0.613534	1.02981	0.57583
0.614662	1.03033	0.58497
0.615789	1.03104	0.59408
0.616917	1.03194	0.60316
0.618045	1.03303	0.61218
0.619173	1.0343	0.62113
0.620301	1.03575	0.63001
0.621429	1.03735	0.63879
0.622556	1.03912	0.64748
0.623684	1.04103	0.65605
0.624812	1.04307	0.6645
0.62594	1.04523	0.67282
0.627068	1.0475	0.681
0.628195	1.04987	0.68903
0.629323	1.05231	0.69691
0.630451	1.05481	0.70462
0.631579	1.05735	0.71218
0.632707	1.05992	0.71957
0.633835	1.0625	0.72679
0.634962	1.06507	0.73384
0.63609	1.0676	0.74074
0.637218	1.07008	0.74747
0.638346	1.07249	0.75404
0.639474	1.07481	0.76046
0.640602	1.07702	0.76675
0.641729	1.0791	0.7729
0.642857	1.08103	0.77894
0.643985	1.08279	0.78487
0.645113	1.08436	0.79071
0.646241	1.08574	0.79649
0.647368	1.08689	0.80221
0.648496	1.08781	0.80789
0.649624	1.08848	0.81357
0.650752	1.0889	0.81926
0.65188	1.08904	0.82499
0.653008	1.08891	0.83078
0.654135	1.08848	0.83666
0.655263	1.08777	0.84266
0.656391	1.08675	0.84881
0.657519	1.08543	0.85513
0.658647	1.08381	0.86165
0.659774	1.08189	0.86842
0.660902	1.07967	0.87545
0.66203	1.07716	0.88278
0.663158	1.07436	0.89044
0.664286	1.07128	0.89846
0.665414	1.06794	0.90688
0.666541	1.06433	0.91572
0.667669	1.06049	0.92503
0.668797	1.05642	0.93482
0.669925	1.05215	0.94514
0.671053	1.04769	0.95601
0.67218	1.04306	0.96746
0.673308	1.0383	0.97953
0.674436	1.03342	0.99224
0.675564	1.02845	1.00562
0.676692	1.02343	1.0197
0.67782	1.01838	1.0345
0.678947	1.01335	1.05006
0.680075	1.00835	1.06639
0.681203	1.00344	1.08352
0.682331	0.99864	1.10146
0.683459	0.994	1.12025
0.684586	0.98955	1.1399
0.685714	0.98534	1.16044
0.686842	0.98141	1.18186
0.68797	0.97779	1.20421
0.689098	0.97455	1.22748
0.690226	0.97171	1.2517
0.691353	0.96933	1.27687
0.692481	0.96746	1.30303
0.693609	0.96613	1.33017
0.694737	0.9654	1.35832
0.695865	0.96531	1.38749
0.696992	0.96593	1.41771
0.69812	0.9673	1.44897
0.699248	0.96947	1.48131
0.700376	0.97252	1.51475
0.701504	0.97649	1.54931
0.702632	0.98146	1.58501
0.703759	0.9875	1.62188
0.704887	0.99469	1.65996
0.706015	1.0031	1.69926
0.707143	1.01285	1.73984
0.708271	1.02401	1.78172
0.709399	1.03671	1.82495
0.710526	1.05108	1.86957
0.711654	1.06724	1.91562
0.712782	1.08538	1.96315
0.71391	1.10565	2.0122
0.715038	1.12826	2.06282
0.716165	1.15344	2.11505
0.717293	1.18144	2.16893
0.718421	1.21257	2.22448
0.719549	1.24714	2.28173
0.720677	1.28555	2.34067
0.721805	1.32824	2.40127
0.722932	1.37569	2.46348
0.72406	1.42847	2.52718
0.725188	1.48722	2.5922
0.726316	1.55268	2.65827
0.727444	1.62565	2.72499
0.728571	1.70704	2.79183
0.729699	1.79783	2.85803
0.730827	1.89908	2.92256
0.731955	2.01187	2.98406
0.733083	2.13719	3.04074
0.734211	2.27592	3.0903
0.735338	2.42856	3.12988
0.736466	2.59506	3.15598
0.737594	2.77442	3.16466
0.738722	2.96442	3.15168
0.73985	3.16133	3.11287
0.740977	3.35966	3.04496
0.742105	3.55251	2.94632
0.743233	3.73208	2.81746
0.744361	3.89092	2.66192
0.745489	4.02283	2.48546
0.746617	4.12423	2.29568
0.747744	4.19406	2.10056
0.748872	4.23411	1.90741
0.75	4.24773	1.72208
0.751128	4.23939	1.54855
0.752256	4.21376	1.38911
0.753383	4.17514	1.24471
0.754511	4.12729	1.11522
0.755639	4.07329	0.99989
0.756767	4.01554	0.8976
0.757895	3.95587	0.80713
0.759023	3.89562	0.72718
0.76015	3.83576	0.65652
0.761278	3.77698	0.59402
0.762406	3.71974	0.53865
0.763534	3.66431	0.48952
0.764662	3.61089	0.44584
0.765789	3.55955	0.40692
0.766917	3.51032	0.37215
0.768045	3.4632	0.34103
0.769173	3.41813	0.31311
0.770301	3.37505	0.28801
0.771429	3.33388	0.26539
0.772556	3.29455	0.24496
0.773684	3.25695	0.22647
0.774812	3.22102	0.20971
0.77594	3.18666	0.19448
0.777068	3.15379	0.18062
0.778195	3.12232	0.16799
0.779323	3.09219	0.15645
0.780451	3.06331	0.1459
0.781579	3.03563	0.13623
0.782707	3.00906	0.12737
0.783835	2.98356	0.11923
0.784962	2.95906	0.11175
0.78609	2.93551	0.10486
0.787218	2.91286	0.09851
0.788346	2.89107	0.09265
0.789474	2.87007	0.08724
0.790602	2.84985	0.08224
0.791729	2.83035	0.07762
0.792857	2.81153	0.07334
0.793985	2.79338	0.06938
0.795113	2.77584	0.06571
0.796241	2.7589	0.0623
0.797368	2.74252	0.05914
0.798496	2.72667	0.05621
0.799624	2.71134	0.05349
0.800752	2.6965	0.05096
0.80188	2.68212	0.04861
0.803008	2.66819	0.04643
0.804135	2.65468	0.0444
0.805263	2.64158	0.04251
0.806391	2.62887	0.04076
0.807519	2.61653	0.03914
0.808647	2.60455	0.03763
0.809774	2.59292	0.03623
0.810902	2.58161	0.03492
0.81203	2.57062	0.03372
0.813158	2.55993	0.0326
0.814286	2.54953	0.03156
0.815414	2.53941	0.0306
0.816541	2.52956	0.02971
0.817669	2.51998	0.0289
0.818797	2.51064	0.02814
0.819925	2.50155	0.02744
0.821053	2.49268	0.0268
0.82218	2.48405	0.02622
0.823308	2.47563	0.02568
0.824436	2.46742	0.02519
0.825564	2.45941	0.02474
0.826692	2.4516	0.02434
0.82782	2.44399	0.02397
0.828947	2.43655	0.02364
0.830075	2.4293	0.02335
0.831203	2.42222	0.02309
0.832331	2.41532	0.02286
0.833459	2.40858	0.02266
0.834586	2.402	0.02249
0.835714	2.39559	0.02234
0.836842	2.38935	0.02221
0.83797	2.38327	0.02209
0.839098	2.37732	0.02196
0.840226	2.37152	0.02183
0.841353	2.36584	0.0217
0.842481	2.36028	0.02158
0.843609	2.35485	0.02145
0.844737	2.34952	0.02133
0.845865	2.34431	0.02121
0.846992	2.3392	0.02109
0.84812	2.33419	0.02097
0.849248	2.32928	0.02085
0.850376	2.32446	0.02073
0.851504	2.31974	0.02061
0.852632	2.31511	0.02049
0.853759	2.31055	0.02037
0.854887	2.30609	0.02026
0.856015	2.3017	0.02014
0.857143	2.29739	0.02003
0.858271	2.29316	0.01992
0.859399	2.289	0.0198
0.860526	2.28492	0.01969
0.861654	2.2809	0.01958
0.862782	2.27695	0.01947
0.86391	2.27307	0.01936
0.865038	2.26925	0.01926
0.866165	2.26549	0.01915
0.867293	2.26179	0.01904
0.868421	2.25815	0.01894
0.869549	2.25457	0.01884
0.870677	2.25105	0.01873
0.871805	2.24758	0.01863
0.872932	2.24416	0.01853
0.87406	2.24079	0.01843
0.875188	2.23748	0.01833
0.876316	2.23421	0.01823
0.877444	2.231	0.01813
0.878571	2.22783	0.01803
0.879699	2.2247	0.01794
0.880827	2.22163	0.01784
0.881955	2.21859	0.01775
0.883083	2.2156	0.01765
0.884211	2.21265	0.01756
0.885338	2.20974	0.01747
0.886466	2.20687	0.01738
0.887594	2.20404	0.01728
0.888722	2.20125	0.01719
0.88985	2.1985	0.0171
0.890977	2.19578	0.01702
0.892105	2.1931	0.01693
0.893233	2.19045	0.01684
0.894361	2.18784	0.01675
0.895489	2.18526	0.01667
0.896617	2.18272	0.01658
0.897744	2.18021	0.0165
0.898872	2.17773	0.01642
0.9	2.17528	0.01633

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: —

C₃₂H₄₄N₂O₆ (SQIB): all datasets

About C32H44N2O6 (SQIB)

SQIB is a squaraine dye molecule widely studied for its strong absorption in the near-infrared region and excellent photostability. With a molecular formula of C₃₂H₄₄N₂O₆, it consists of a central squaraine core linked to substituted diisobutylamino-hydroxyphenyl groups. The abbreviation SQIB comes from “SQ” for squaraine and “IB” for the diisobutyl substituents.
SQIB is most often investigated in its crystalline form, where the molecules arrange into ordered π–π stacked structures. These single crystals and crystalline thin films exhibit sharp and intense absorption bands, strong excitonic coupling, and anisotropic optical properties that depend on crystal orientation.
The bulky alkyl substituents improve solubility in organic solvents and facilitate the growth of high-quality films and crystals. SQIB crystals are of significant interest for organic photovoltaics (OPVs), organic field-effect transistors (OFETs), near-infrared photodetectors, and fundamental studies of exciton transport and molecular aggregation.
Owing to its strong optical response, tunable self-assembly, and crystalline order, SQIB remains an important model compound in the design of next-generation optoelectronic materials.

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Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/organic/C32H44N2O6 - SQIB/nk/Funke-gamma.yml
ID: ds_29fc00912a37
API: /v1/datasets/ds_29fc00912a37

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