Magnetically tunable optical absorbance in a colloidal system

被引：10

作者：

Adrian, M. ^{[1
]}

Helseth, L. E. ^{[1
,2
]}

机构：

[1] Nanyang Technol Univ, Sch Math & Phys Sci, Div Phys & Appl Phys, Singapore, Singapore

[2] Univ Bergen, Dept Phys & Technol, N-5007 Bergen, Norway

来源：

PHYSICAL REVIEW E | 2008年 / 77卷 / 02期

关键词：

D O I：

10.1103/PhysRevE.77.021403

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We study the optical absorbance from a magnetically arranged colloidal structure, and investigate the possibility of creating a magnetically controlled optical sensor using this system. The colloids form chains when exposed to an external magnetic field, which tend to collapse and form a more random particle arrangement when the field is removed. We show that a small magnetic field is able to change the sensor's reflection coefficient by more than 30%, and investigate in detail the relaxation mechanism when the field is turned off.

引用

页数：5

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