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Color Vision

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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.

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Related Experiment Video

Updated: Aug 5, 2025

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

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Published on: May 20, 2013

Green Reflector with Predicted Chromatic Coordinates.

Xin Tong^1,2, Zhuo Yang^1,2, Jiali Zhang^1,2

¹School of Microelectronics, Shanghai University, Shanghai 201800, China.

Materials (Basel, Switzerland)

|March 29, 2023

Summary

This summary is machine-generated.

Researchers developed an angle-insensitive green reflector using a simple multilayer dielectric thin film. This silicon nitride/silicon dioxide stack offers potential for mass production and integration with semiconductor devices.

Keywords:

chromatic coordinates finite-difference time-domain green reflector inductively coupled plasma chemical vapor deposition transfer matrix method

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Area of Science:

Optics and Photonics
Materials Science
Thin Film Technology

Background:

Multilayer thin film reflectors are crucial for optical applications and semiconductor device integration.
Wafer-scale deposition offers potential for cost-effective mass production of optical components.

Purpose of the Study:

To design and fabricate an angle-insensitive green reflector with a simple multilayer dielectric thin film structure.
To investigate the optical properties and color stability of the developed reflector under varying angles of incidence.

Main Methods:

Fabrication of a SiN/SiO2 multilayer thin film stack using inductively coupled plasma chemical vapor deposition (ICPCVD) at 80 °C.
Characterization of the reflector's spectral properties, including maximum reflectivity, FWHM, and chromatic coordinates (CIE 1931).
Angle-resolved spectroscopy was employed to assess the reflector's performance under p/s-polarized light at variable angles of incidence.

Main Results:

A green reflector with a maximum reflectivity of 73% at 561 nm and a FWHM of 87 nm was achieved.
The multilayer stack incorporated a silicon-rich nitride material with an ultrahigh refractive index.
The reflector exhibited minimal spectral blue-shift with increasing incident angle, maintaining its green color.

Conclusions:

The developed SiN/SiO2 multilayer thin film reflector demonstrates angle-insensitive green color performance.
The fabrication process, utilizing ICPCVD at low temperatures, is suitable for large-scale production.
This technology holds promise for integration into photonic and semiconductor devices requiring stable color reflection.