Optical Magnetic Field Probe with a Loop Antenna Element Doubly Loaded with LiNbO3 Crystals

Eiji SUZUKI
Satoru ARAKAWA
Hiroyasu OTA
Ken Ichi ARAI
Risaburo SATO

Publication
IEICE TRANSACTIONS on Electronics   Vol.E87-C    No.11    pp.1989-1996
Publication Date: 2004/11/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
probe,  loop antenna,  electro-optic crystal,  electromagnetic near-field,  Pockels effect,  

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Summary: 
This paper presents a new type of optical probe designed to detect magnetic near-fields with high accuracy in the gigahertz range. Its probe head consists of a loop antenna element doubly loaded with LiNbO3 electro-optic crystals. Through an optical technique, it can work as a conventional double-loaded loop probe without metallic cables or an electrical hybrid junction. We examined probe characteristics for magnetic field detection up to 20 GHz. We confirmed that the probe can measure magnetic fields near a microstrip line in the gigahertz range and can suppress influence of electric fields.