Optical constants

Refractive index of HfSe2 (Hafnium diselenide)

Zotev et al. 2023: n,k(e) 0.36–1.0 µm

Data: tabulated nk
Range: 0.36–1 µm
Points: 402
Optical axis: e
Licence: CC0-1.0

Uniaxial crystal, axes: oe

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 3.95266
Extinction coefficient k: 0

Permittivity ε₁: 15.6235
Permittivity ε₂: 0

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

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.40625 µm⁻¹

Group index n_g: 4.19137
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

# HfSe2 (Hafnium diselenide): Zotev et al. 2023: n,k(e) 0.36–1.0 µm
hfse2 = ls.fetch_refractiveindex("main", "HfSe2", "Zotev-e", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(hfse2.range_nm)  # (360, 1000) nm
eps = hfse2.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_981f25f26498/lightsmith"
hfse2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(hfse2.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (hfse2/zotev-2023-e).

# ... load hfse2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=hfse2)],
    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

Multilayer crystals. Out-of-plane (extraordinary ray, e). Room temperature.

Conditions

direction: e

References

P. G. Zotev, Y. Wang, D. Andres-Penares, T. Severs-Millard, S. Randerson, X. Hu, L. Sortino, C. Louca, M. Brotons-Gisbert, T. Huq, S. Vezzoli, R. Sapienza, T. F. Krauss, B. D. Gerardot, A. I. Tartakovskii. Van der Waals materials for applications in nanophotonics. Laser and Photonics Rev. 17, 2200957 (2023) (Numerical data kindly provided by Panaiot Zotev)

doi:10.1002/lpor.202200957 Van der Waals Materials for Applications in Nanophotonics, Laser & Photonics Reviews (2023)

Cite

Panaiot G. Zotev et al.. Van der Waals Materials for Applications in Nanophotonics. Laser & Photonics Reviews, 17, 2200957 (2023), doi:10.1002/lpor.202200957; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

402 rows as published

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

HfSe2 (Hafnium diselenide), Zotev et al. 2023: n,k(e) 0.36–1.0 µm: n and k versus wavelength
λ (µm)	n	k
0.36	4.15012	0.0
0.3616	4.14733	0.0
0.3632	4.14457	0.0
0.3648	4.14186	0.0
0.3664	4.13917	0.0
0.368	4.13653	0.0
0.3696	4.13391	0.0
0.3712	4.13133	0.0
0.3728	4.12879	0.0
0.3744	4.12627	0.0
0.376	4.12379	0.0
0.3776	4.12134	0.0
0.3792	4.11892	0.0
0.3808	4.11653	0.0
0.3824	4.11417	0.0
0.384	4.11184	0.0
0.3856	4.10954	0.0
0.3872	4.10727	0.0
0.3888	4.10502	0.0
0.3904	4.1028	0.0
0.392	4.10061	0.0
0.3936	4.09845	0.0
0.3952	4.09631	0.0
0.3968	4.0942	0.0
0.3984	4.09212	0.0
0.4	4.09006	0.0
0.4016	4.08802	0.0
0.4032	4.08601	0.0
0.4048	4.08402	0.0
0.4064	4.08206	0.0
0.408	4.08011	0.0
0.4096	4.0782	0.0
0.4112	4.0763	0.0
0.4128	4.07442	0.0
0.4144	4.07257	0.0
0.416	4.07074	0.0
0.4176	4.06893	0.0
0.4192	4.06714	0.0
0.4208	4.06537	0.0
0.4224	4.06362	0.0
0.424	4.06189	0.0
0.4256	4.06018	0.0
0.4272	4.05849	0.0
0.4288	4.05682	0.0
0.4304	4.05516	0.0
0.432	4.05353	0.0
0.4336	4.05191	0.0
0.4352	4.05031	0.0
0.4368	4.04873	0.0
0.4384	4.04717	0.0
0.44	4.04562	0.0
0.4416	4.04409	0.0
0.4432	4.04257	0.0
0.4448	4.04107	0.0
0.4464	4.03959	0.0
0.448	4.03813	0.0
0.4496	4.03668	0.0
0.4512	4.03524	0.0
0.4528	4.03382	0.0
0.4544	4.03242	0.0
0.456	4.03103	0.0
0.4576	4.02965	0.0
0.4592	4.02829	0.0
0.4608	4.02694	0.0
0.4624	4.02561	0.0
0.464	4.02429	0.0
0.4656	4.02299	0.0
0.4672	4.02169	0.0
0.4688	4.02041	0.0
0.4704	4.01915	0.0
0.472	4.0179	0.0
0.4736	4.01666	0.0
0.4752	4.01543	0.0
0.4768	4.01421	0.0
0.4784	4.01301	0.0
0.48	4.01182	0.0
0.4816	4.01064	0.0
0.4832	4.00947	0.0
0.4848	4.00831	0.0
0.4864	4.00717	0.0
0.488	4.00604	0.0
0.4896	4.00491	0.0
0.4912	4.0038	0.0
0.4928	4.0027	0.0
0.4944	4.00161	0.0
0.496	4.00053	0.0
0.4976	3.99946	0.0
0.4992	3.9984	0.0
0.5008	3.99735	0.0
0.5024	3.99631	0.0
0.504	3.99529	0.0
0.5056	3.99427	0.0
0.5072	3.99326	0.0
0.5088	3.99226	0.0
0.5104	3.99127	0.0
0.512	3.99029	0.0
0.5136	3.98931	0.0
0.5152	3.98835	0.0
0.5168	3.98739	0.0
0.5184	3.98645	0.0
0.52	3.98551	0.0
0.5216	3.98459	0.0
0.5232	3.98367	0.0
0.5248	3.98275	0.0
0.5264	3.98185	0.0
0.528	3.98096	0.0
0.5296	3.98007	0.0
0.5312	3.97919	0.0
0.5321	3.9787	0.0
0.5328	3.97832	0.0
0.5344	3.97746	0.0
0.536	3.9766	0.0
0.5376	3.97575	0.0
0.5392	3.97491	0.0
0.5408	3.97408	0.0
0.5424	3.97326	0.0
0.544	3.97244	0.0
0.5456	3.97163	0.0
0.5472	3.97082	0.0
0.5488	3.97003	0.0
0.5504	3.96924	0.0
0.552	3.96846	0.0
0.5536	3.96768	0.0
0.5552	3.96691	0.0
0.5568	3.96615	0.0
0.5584	3.96539	0.0
0.56	3.96464	0.0
0.5616	3.9639	0.0
0.5632	3.96316	0.0
0.5648	3.96243	0.0
0.5664	3.96171	0.0
0.568	3.96099	0.0
0.5696	3.96027	0.0
0.5712	3.95957	0.0
0.5728	3.95887	0.0
0.5744	3.95817	0.0
0.576	3.95748	0.0
0.5776	3.9568	0.0
0.5792	3.95612	0.0
0.5808	3.95545	0.0
0.5824	3.95479	0.0
0.584	3.95412	0.0
0.5856	3.95347	0.0
0.5872	3.95282	0.0
0.5888	3.95217	0.0
0.5904	3.95153	0.0
0.592	3.9509	0.0
0.5936	3.95027	0.0
0.5952	3.94965	0.0
0.5968	3.94903	0.0
0.5984	3.94841	0.0
0.6	3.9478	0.0
0.6016	3.9472	0.0
0.6032	3.9466	0.0
0.6048	3.946	0.0
0.6064	3.94541	0.0
0.608	3.94483	0.0
0.6096	3.94425	0.0
0.6112	3.94367	0.0
0.6128	3.9431	0.0
0.6144	3.94253	0.0
0.616	3.94197	0.0
0.6176	3.94141	0.0
0.6192	3.94086	0.0
0.6208	3.94031	0.0
0.6224	3.93976	0.0
0.624	3.93922	0.0
0.6256	3.93868	0.0
0.6272	3.93815	0.0
0.6288	3.93762	0.0
0.6304	3.93709	0.0
0.632	3.93657	0.0
0.6336	3.93605	0.0
0.6352	3.93554	0.0
0.6368	3.93503	0.0
0.6384	3.93452	0.0
0.64	3.93402	0.0
0.6416	3.93352	0.0
0.6432	3.93303	0.0
0.6448	3.93254	0.0
0.6464	3.93205	0.0
0.648	3.93157	0.0
0.6496	3.93109	0.0
0.6512	3.93061	0.0
0.6528	3.93014	0.0
0.6544	3.92967	0.0
0.656	3.9292	0.0
0.6576	3.92874	0.0
0.6592	3.92828	0.0
0.6608	3.92782	0.0
0.6624	3.92737	0.0
0.664	3.92692	0.0
0.6656	3.92648	0.0
0.6672	3.92603	0.0
0.6688	3.92559	0.0
0.6704	3.92516	0.0
0.672	3.92472	0.0
0.6736	3.92429	0.0
0.6752	3.92387	0.0
0.6768	3.92344	0.0
0.6784	3.92302	0.0
0.68	3.9226	0.0
0.6816	3.92219	0.0
0.6832	3.92177	0.0
0.6848	3.92136	0.0
0.6864	3.92096	0.0
0.688	3.92055	0.0
0.6896	3.92015	0.0
0.6912	3.91975	0.0
0.6928	3.91936	0.0
0.6944	3.91896	0.0
0.696	3.91857	0.0
0.6976	3.91819	0.0
0.6992	3.9178	0.0
0.7008	3.91742	0.0
0.7024	3.91704	0.0
0.704	3.91666	0.0
0.7056	3.91629	0.0
0.7072	3.91592	0.0
0.7088	3.91555	0.0
0.7104	3.91518	0.0
0.712	3.91482	0.0
0.7136	3.91445	0.0
0.7152	3.91409	0.0
0.7168	3.91374	0.0
0.7184	3.91338	0.0
0.72	3.91303	0.0
0.7216	3.91268	0.0
0.7232	3.91233	0.0
0.7248	3.91199	0.0
0.7264	3.91164	0.0
0.728	3.9113	0.0
0.7296	3.91096	0.0
0.7312	3.91063	0.0
0.7328	3.91029	0.0
0.7344	3.90996	0.0
0.736	3.90963	0.0
0.7376	3.9093	0.0
0.7392	3.90898	0.0
0.7408	3.90865	0.0
0.7424	3.90833	0.0
0.744	3.90801	0.0
0.7456	3.9077	0.0
0.7472	3.90738	0.0
0.7488	3.90707	0.0
0.7504	3.90676	0.0
0.752	3.90645	0.0
0.7536	3.90614	0.0
0.7552	3.90583	0.0
0.7568	3.90553	0.0
0.7584	3.90523	0.0
0.76	3.90493	0.0
0.7616	3.90463	0.0
0.7632	3.90434	0.0
0.7648	3.90404	0.0
0.7664	3.90375	0.0
0.768	3.90346	0.0
0.7696	3.90317	0.0
0.7712	3.90288	0.0
0.7728	3.9026	0.0
0.7744	3.90232	0.0
0.776	3.90203	0.0
0.7776	3.90176	0.0
0.7792	3.90148	0.0
0.7808	3.9012	0.0
0.7824	3.90093	0.0
0.784	3.90065	0.0
0.7856	3.90038	0.0
0.7872	3.90011	0.0
0.7888	3.89985	0.0
0.7904	3.89958	0.0
0.792	3.89931	0.0
0.7936	3.89905	0.0
0.7952	3.89879	0.0
0.7968	3.89853	0.0
0.7984	3.89827	0.0
0.8	3.89801	0.0
0.8016	3.89776	0.0
0.8032	3.89751	0.0
0.8048	3.89725	0.0
0.8064	3.897	0.0
0.808	3.89675	0.0
0.8096	3.89651	0.0
0.8112	3.89626	0.0
0.8128	3.89601	0.0
0.8144	3.89577	0.0
0.816	3.89553	0.0
0.8176	3.89529	0.0
0.8192	3.89505	0.0
0.8208	3.89481	0.0
0.8224	3.89457	0.0
0.824	3.89434	0.0
0.8256	3.89411	0.0
0.8272	3.89387	0.0
0.8288	3.89364	0.0
0.8304	3.89341	0.0
0.832	3.89318	0.0
0.8336	3.89296	0.0
0.8352	3.89273	0.0
0.8368	3.89251	0.0
0.8384	3.89228	0.0
0.84	3.89206	0.0
0.8416	3.89184	0.0
0.8432	3.89162	0.0
0.8448	3.89141	0.0
0.8464	3.89119	0.0
0.848	3.89097	0.0
0.8496	3.89076	0.0
0.8512	3.89054	0.0
0.8528	3.89033	0.0
0.8544	3.89012	0.0
0.856	3.88991	0.0
0.8576	3.8897	0.0
0.8592	3.8895	0.0
0.8608	3.88929	0.0
0.8624	3.88909	0.0
0.864	3.88888	0.0
0.8656	3.88868	0.0
0.8672	3.88848	0.0
0.8688	3.88828	0.0
0.8704	3.88808	0.0
0.872	3.88788	0.0
0.8736	3.88768	0.0
0.8752	3.88749	0.0
0.8768	3.88729	0.0
0.8784	3.8871	0.0
0.88	3.8869	0.0
0.8816	3.88671	0.0
0.8832	3.88652	0.0
0.8848	3.88633	0.0
0.8864	3.88614	0.0
0.888	3.88596	0.0
0.8896	3.88577	0.0
0.8912	3.88558	0.0
0.8928	3.8854	0.0
0.8944	3.88521	0.0
0.896	3.88503	0.0
0.8976	3.88485	0.0
0.8992	3.88467	0.0
0.9008	3.88449	0.0
0.9024	3.88431	0.0
0.904	3.88413	0.0
0.9056	3.88396	0.0
0.9072	3.88378	0.0
0.9088	3.8836	0.0
0.9104	3.88343	0.0
0.912	3.88326	0.0
0.9136	3.88308	0.0
0.9152	3.88291	0.0
0.9168	3.88274	0.0
0.9184	3.88257	0.0
0.92	3.8824	0.0
0.9216	3.88224	0.0
0.9232	3.88207	0.0
0.9248	3.8819	0.0
0.9264	3.88174	0.0
0.928	3.88157	0.0
0.9296	3.88141	0.0
0.9312	3.88125	0.0
0.9328	3.88108	0.0
0.9344	3.88092	0.0
0.936	3.88076	0.0
0.9376	3.8806	0.0
0.9392	3.88044	0.0
0.9408	3.88029	0.0
0.9424	3.88013	0.0
0.944	3.87997	0.0
0.9456	3.87982	0.0
0.9472	3.87966	0.0
0.9488	3.87951	0.0
0.9504	3.87936	0.0
0.952	3.8792	0.0
0.9536	3.87905	0.0
0.9552	3.8789	0.0
0.9568	3.87875	0.0
0.9584	3.8786	0.0
0.96	3.87845	0.0
0.9616	3.87831	0.0
0.9632	3.87816	0.0
0.9648	3.87801	0.0
0.9664	3.87787	0.0
0.968	3.87772	0.0
0.9696	3.87758	0.0
0.9712	3.87744	0.0
0.9728	3.87729	0.0
0.9744	3.87715	0.0
0.976	3.87701	0.0
0.9776	3.87687	0.0
0.9792	3.87673	0.0
0.9808	3.87659	0.0
0.9824	3.87645	0.0
0.984	3.87631	0.0
0.9856	3.87618	0.0
0.9872	3.87604	0.0
0.9888	3.8759	0.0
0.9904	3.87577	0.0
0.992	3.87563	0.0
0.9936	3.8755	0.0
0.9952	3.87537	0.0
0.9968	3.87523	0.0
0.9984	3.8751	0.0
1.0	3.87497	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: —

HfSe2 (Hafnium diselenide): all datasets

Multilayer flakes

About HfSe2 (Hafnium diselenide)

Hafnium diselenide (HfSe₂) is a layered transition metal dichalcogenide known for its intriguing electronic and optical properties. It crystallizes in a hexagonal structure, akin to other materials in its class, such as molybdenum disulfide (MoS₂). Notably, HfSe₂ exhibits a narrow indirect bandgap, which makes it a subject of interest for semiconductor applications in nanoelectronics and optoelectronics. Its layered nature allows for exfoliation into thin films or even monolayers, providing a platform for exploring two-dimensional material physics and enabling potential applications in flexible and transparent devices. In addition to its electronic properties, HfSe₂ has been studied for its thermal stability and mechanical strength, which further enhance its appeal in various technological applications. However, the optical properties, particularly its refractive index, are less explored compared to its electronic characteristics. The refractive index of HfSe₂ is crucial for designing optical components like waveguides and photodetectors, where precise control over light-matter interaction is essential. As research in this material progresses, understanding and tabulating its refractive index across different wavelengths will provide valuable insights for both fundamental studies and practical applications.

More about HfSe2 (Hafnium diselenide) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/HfSe2/nk/Zotev-e.yml
ID: ds_981f25f26498
API: /v1/datasets/ds_981f25f26498

Plot