npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Physics: Sae Mulli 2017; 67: 877-882

Published online July 31, 2017

Copyright © New Physics: Sae Mulli.

Polarization Characteristics of a Silicon-Based Pyramidal Mirror for a Magneto-Optical Trap

Sug Tae  KANG1, Dong Jin LEE1, Eun Gang KIM1, Jung Bok KIM*1, Jun Tae JIN2, Jun Seong EOM2, Seung Seob LEE2

1 Department of Physics Education, Korea National University of Education, Cheongju 28173, Korea
2 Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea


Received: April 22, 2017; Revised: June 7, 2017

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


We investigated the image of light reflected by a pyramidal mirror with a vertex angle of 70.5 degrees and a length of one side of 1.5 mm. The pyramidal mirror was produced by using photolithography, bulk etching of silicon, and electroplating. As a result, three different types of reflection paths were observed, and the changes in the polarization of the reflected light were measured for each of the three types. In addition, the polarization change was theoretically calculated by using the Fresnel equation with the reflection angle for each of the three types and the complex refractive index of the mirror. The validity of the measured values was verified through comparison with the theoretical values, and an analytical model for the change in the polarization caused by reflection from a pyramidal mirror with a vertex angle of 70.5 degrees was developed.

Keywords: Pyramidal mirror, Polarization change, Magneto-optical trap

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