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Related Experiment Video

Updated: May 1, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

Optical broadband angular selectivity.

Yichen Shen¹, Dexin Ye, Ivan Celanovic

¹Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Science (New York, N.Y.)

|March 29, 2014

Summary

This summary is machine-generated.

This study presents a new method for angularly selective light transmission using photonic crystals. The technique achieves broadband visible spectrum transparency at a specific angle, acting as a generalized Brewster angle filter.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Angular light selection is challenging, often coupling with frequency dependence.
Existing angularly selective systems struggle with broadband operation.

Purpose of the Study:

To develop a method for light selection based purely on the angle of propagation across a broadband spectrum.
To achieve angular selectivity without compromising frequency transmission.

Main Methods:

Tailoring the overlap of band gaps in multiple one-dimensional photonic crystals with varying periodicity.
Utilizing the characteristic Brewster modes across a broadband spectrum.
Experimental realization of an all-visible spectrum, p-polarized angularly selective system.

Main Results:

Preservation of Brewster modes across a broadband spectrum.
Demonstration of transparency throughout the visible spectrum at a generalized Brewster angle.
Achieved reflection at all other viewing angles.

Conclusions:

The developed method successfully decouples angular selectivity from frequency dependence.
This provides a novel approach for creating broadband angularly selective optical filters.
The system offers tunable transparency and reflection based on viewing angle.