Refractive index database

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Optical constants of Norland NOA 61
Joseph et al. 2020: 1000-nm film, Uncured; n 0.246–1.69 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Conditions & Spec sheet

n_is_absolute: true
wavelength_is_vacuum: true
film_thickness: 1e-6
substrate: glass


NOA-61 UV curable resin (Norland Optical Adhesive 61) thin film (thickness 1000 nm) on glass substrate.


S. Joseph, S. Sarkar, J. Joseph, Grating-coupled surface plasmon-polariton sensing at a flat metal–analyte interface in a hybrid-configuration, ACS Appl. Mater. Interfaces, 12, 46519-46529 (2020)
(Numerical data kindly provided by Prof. Joby Joseph)


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Optical Adhesives

Optical adhesives are specialized compounds designed to bond optical components together while maintaining high optical clarity and integrity. These adhesives are commonly used in the assembly and repair of optical systems such as lenses, prisms, and fiber optics. Unlike standard adhesives, optical adhesives are formulated to have minimal impact on light transmission, refractive index, and overall optical performance. They may be UV-curable, heat-curable, or cure at room temperature, depending on the application requirements. These adhesives also often possess additional qualities such as resistance to humidity, temperature stability, and low outgassing to ensure longevity and reliability in various environments. The selection of the appropriate optical adhesive is crucial to the success of an optical system, as the wrong choice can lead to optical aberrations, delamination, or system failure.

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