Chem. Refractive index of silicon and germanium and its wavelength and temperature derivatives, J. Phys. Table 1 . Compared to conventional double layer grating, the directionality exceeds 72% for wavelengths from 1450 nm to 1600 nm, with a maximum directionality of 97.5% at 1550 nm. Below are files of complete refractive index and extinction coefficients. Inasmuch as the temperature coefficient of the Si 3 N 4 refractive index (2.45 10 5 K -1 [2]) is much smaller than in silicon on an insulator (1.8 10 -4 K -1 [3]), the former is less . If the file is not available for download, you can request our proprietary file by clicking "Request". The data for the above graph is given below. W - wavelength a - absorption coefficient It forms the basis of nearly all non-optical semiconductor devices. The observed tunability of the complex reective index as the function of gate electric voltage is in agreement with the prediction based on the Kubo formula. Dielectric functions and optical parameters of Si, Ge, GaP, GaAs, GaSb, InP, InAs, and InSb from 1.5 to 6.0 eV, Phys. Refractive Index of Si3N4, Silicon Nitride, SiN, SiON For a typical sample of Si3N4 the refractive index and extinction coefficient at 632.8 nm are 2.02252 and 0. Silicon nitride is a chemical compound of the elements silicon and nitrogen. Data 9, 561-658 (1993) Data [CSV - comma separated] [TXT - tab separated] [Full database record] Optical transmission calculator Refractive Index of Amorphous Silicon For a typical sample of Amorphous Silicon the refractive index and extinction coefficient at 632.8 nm are 4.49977 and 0.2432256. H. H. Li. If the refractive index of silicon varies with temperature is linear, dn/dt = 2x104 /K. Popular Selections: Acrylic Al2O3 Au ITO Quartz Si Si3N4 SiO2 (nm) optical constants Rev. Standard refractive index measurements are taken at the "yellow doublet" sodium D line, with a wavelength () of 589 nanometers . Even the constant refractive index values for core and cladding taken in literature are based on step approximation of . The details of its refractive index temperature dependence are also well studied. It is a white, high-melting-point solid that is relatively chemically inert, being attacked by dilute HF and hot H Wavelength, m n, k 5 10 15 20 0 0.5 1 1.5 2 2.5 3 3.5 4 RefractiveIndex.INFO Si (Silicon) Chandler-Horowitz and Amirtharaj 2005: n 2.5-22.2 m, k 6.25-23.3 m n k LogX LogY eV Derived optical constants Chromatic dispersion [ i ] dn/d = -0.018733 m -1 Group index [ i ] [ i ] ng = 3.4869 Group velocity dispersion [ i ] [ i ] [ i ] 2, however, i . Some multimode fibers have graded index profile. effective index: since silicon has a high thermo-optic (TO) coef-cient of 1.86104 K1, this can result in a lter wavelength shift of 80 pm/K [4]. Please calculate the designed radius of the ring resonator and the nearest resonance peak around 1550nm. Effective refractive index at 1310nm is 1.4674, and at 1550nm is 1.4679. . Comments. The observed tunability of the complex reective index as the function of gate electric voltage is in agreement with the prediction based on the Kubo formula. Above a wavelength of 400 nm, the transmission of SU-8 is greater than 95%. Refractive Index of Si, Silicon Silicon is the second-most common element on Earth. If the file is not available for download, you can request our proprietary file by clicking "Request". 10 16 cm 2 /W for wavelengths around 1.5 m, whereas some chalcogenide glasses exhibit several hundred times higher values.. Semiconductor materials also have very high nonlinear index values. Each material in the database has refractive index listed as a function of wavelength over a range typically required for thin-film thickness measurement. Real and (negative) imaginary components of the refractive index for silicon at 300 K. The reflectivity of a polished silicon wafer is determined from the complex refractive index. Wherever. dn/dT 8.45 106 K1 [19] Beam . Question: Consider a 0.45um wide silicon ring with a ng = 4.205 and neff = 2.45 at 1550nm and a FSR = 3.2nm at normal temperature 300K. Si 3 N 4 is the most thermodynamically stable and commercially important of the silicon nitrides, and the term "silicon nitride" commonly refers to this specific composition. The refractive index is optimized using simulated annealing. As noted above, it is also available in a much more convenient Excel spreadsheet. coeff. Experimental observations of a linear variation of the static refractive index with the Urbach tail parameter for borondoped chemically vapor deposited films have been analyzed. With the help of 6 glass specific parameters D 0, D 1, D 2, E 0, E 1 and TK, the value of the temperature coefficient of the absolute refractive index (compared to vacuum) as a function of temperature and wavelength can be calculated with equation (1) for each glass type. This material also has a low dielectric constant (as measured by transmission interference fringes), and is an excellent choice for high-end solar cells. The thermo-optic coefficient of silicon was measured at 1550 nm in the wide temperature range from 5 K to 300 K. For this purpose an interferometric measurement scheme was applied using the silicon sample as a Fabry-Perot etalon. Generally the optical fibers are divided into two in terms of refractive index, as the ones having graded index profile and the ones having step index profile. The complex refractive index of graphene fabricated using chemical vapor deposition is characterized at 1550nm wavelength through the reectivity measurement on a SiO 2/Si substrate. The ordinary refractive index of silicon carbide is 2.530 at 0.51 eV and rises to 0.336 at 3.69 eV. Because fused silica is optically stable and consistent, many use it as a reference or standard for spectroscopic measurements. 350 K (77 C) References. In fact if the refractive index value at 1310 nm is 1.47x, the refractive index value at 1550nm will be 1.47y. The material is a popular material for spacecraft because it has low refraction. The refractive indices of the waveguide core, cladding and substrate are essential input parameters necessary to predict system behavior. SU-8 is optically transparent at 632.8 nm as well as at the telecommunications wavelengths of 1330 nm and 1550 nm. The high resolution of this setup revealed a thermo-optic coefficient as low as at 5 K. Optically, silicon is most interesting as a detector or reflector, where its refractive index and extinction coefficient are of primary importance. Index of refraction n 1.48 [19] Round-trip length L 42 cm Thermal refr. List of refractive indices Refraction at interface Many materials have a well-characterized refractive index, but these indexes often depend strongly upon the frequency of light, causing optical dispersion. The corresponding value for air can be calculated by (2). The high index of refraction of Si of n Si = 3.48 at 1550 nm [11] signicantly reduces the number of single layers required to achieve high reectivities. Ref. The real part of the refractive index is found to vary linearly with a temperature coefficient of 3.85 10 4 while the extinction coefficient is found to vary as exp (3.82 10 3 T), with T = 0 at room temperature. Refractive index database Shelf . It also reduces the geometrical thickness of the coating stack, . B 27, 985-1009 (1983) Data [CSV - comma separated] [TXT - tab separated] [Full database record] Optical transmission calculator. Refractive index [ i ] n = 1.4585 Wavelength, m n, k 2 4 6 1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 1.55 1.6 RefractiveIndex.INFO SiO2 (Silicon dioxide, Silica, Quartz) Malitson 1965: Fused silica; n 0.21-6.7 m n k LogX LogY eV Derived optical constants Abbe number [ i ] Vd = 67.82 Chromatic dispersion [ i ] dn/d = -0.035209 m -1 Refractive Index Database The table below contains links to refractive index data for common materials. Therefore, the far-field. The complex refractive index of graphene fabricated using chemical vapor deposition is characterized at 1550nm wavelength through the reectivity measurement on a SiO 2/Si substrate. Its refractive index varies from 1.55 to 1.40 (for its transparent range: 160nm to 3000nm). Given the extreme sensitivity of a silicon wire waveguide to the exact geometry, it is important to accurately characterize the effective index, including its dispersion, without perturbing Below are files of complete refractive index and extinction coefficients. 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