Birefringent fibers have attracted considerable attention in recent years for their
potential applications in communication and sensing. In this thesis we selectively
infiltrate high-index liquids or liquid crystals (LCs) into specified air holes of the
photonic crystal fibers (PCFs) by using a selective blocking technique and the vacuum
filling method to form half-filled birefringent PCFs and central-filled liquid crystal
PCF (LCPCF).
We first measure the bending loss of the half-filled PCF. Smaller bending loss
was obtained as the PCF was bent in 0¢X due to the dominat index-guiding. Compared
with the full-filled PCF, the half-filled PCF possesses a smaller bending loss for the
reduction of liquid-filled air holes. The birefringent properties of the half-filled PCF
and the LCPCF were then measured in cooperation with the Sagnac fiber loop. We
can obtain the birefringence of the half-filled PCF of 2.39¡Ñ10^-4 at £f = 1411 nm, and
the sensitivity to temperature, strain, and torsion can be obtained as -0.614 nm/¢XC,
0.466 pm/£g£`, and -0.316 nm/deg. These large sensitivities make the half-filled PCF
useful in sensing applications.
We also measured the birefringence of the central-filled LCPCF with variant
laser irradiation and temperature. The optical and thermal birefringence variations
from 2.8¡Ñ10^-3 to 4.12¡Ñ10^-3 and from 2.3¡Ñ10^-3 to 3.3¡Ñ10^-3 can be oberserved,
respectively. The optically and thermally tunable birefringence of the central-filled
LCPCF was experimentally demonstrated.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0718111-211705 |
| Date | 18 July 2011 |
| Creators | Chiang, Chih-Lun |
| Contributors | Tsung-Hsien Lin, Tsong-Sheng Lay, Chin-Ping Yu, Jau-Sheng Wang, Hidenori Taga |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0718111-211705 |
| Rights | not_available, Copyright information available at source archive |
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