9/Dec/2013 added index of refraction of K0.95Na0.05Ta0.58Nb0.42O3 (KNTN) in the visible and NIR. These crystals are interesting in that they have very interesting electro-optic, electrostriction, and electroholography properties, which may make them good candidates for communications devices. Moreover, they are lead-free, which offers additional environmental and fabrication advantages. The material dispersion can be described by a single term single term Sellmeier equation, which makes for simple modeling. From the HIT/DMU Yao, Tian et al ref.

5/Dec/2013 Feedback from ??:I have used your site numerous times to calculate refractive index at different wavelengths of Fused Silica (amorphous) and it appears that the data that is being calculated has changed drastically.I have cross referenced with other sources and it appears to be wrong. Please let me know what the source of the issue is? At 633 nm and room temperature; fused silica should have a refractive index of 1.45705 but your program is giving 1.45834 ANSWER From Luxpop. The feedback is correct. The answer given by Luxpop was wrong as of the date of the feedback (Dec/3). This has now been fixed. Investigation into the root cause of this is ongoing . It appears the database entry for SiO2a was impacted during site updating on Nov/22. As such the returned answer for index of refraction on amorphous SiO2a was off by the noted 0.001 from Nov/22 to today. Luxpop will review its validation procedures in light of this incident and verify other related materials as well. Many thanks to the anonymous contributor who pointed this out.

1/Dec/2013: added index of refraction of polyparaxylylene–silver (PPX–Ag: polymer and silver nanoparticles), based on calculations on reflection spectra from PPX-Ag samples grown at various silver volume percentages from 0 to 15%. This material allows for, among other properties, the creating of interference cutoff filters with a simpler architecture than filters using other methods, from the Boginskaya, Afanas’ev et al ref. Luxpop wishes to thank Dr. I. A. Boginskaya from the ITAE, Russian Academy of Sciences, for the kind assistance provided.

22/Nov/2013: added index of refraction of a three-layered Ag-low-permittivity (LP)-high-permittivity (HP) nanoshell. This is a proposal for "a plausible meta-atom for building ... (3D) isotropic negative refractive index metamaterial(NIM)," for use in such applications as superlensing and light storing. The numerical simulations are from the Wu, Jiang et al ref. Modifying engineering parameters such as the thickness of the middle LP layer can result in controlled shifts of the dispersion curves; other modifications can allow for independent control of the permittivity and permeability. Available under material 'AgLPHP' in code entry window below in most of the visible and some near-infrared.

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