title: Birefringent waveguide sensor using a polarizer rotating technique.
abstract: A birefringence measurement system is introduced to get high phase resolution for detection of low contents of biochemicals. By using a fixed quarter-wave plate and a rotating polarizer, the phase difference between two orthogonal polarizations is transformed into phase delay of output sinusoidal signal. Analyzing the output phase, birefringence change could be detected with a phase noise of 0.14 degrees. As well as the birefringence measurement system, an optical evanescent waveguide sensor was developed. A rib-type silica waveguide overlaid with TiO2 film was fabricated, and a developed birefringence measurement technique was employed in evaluating a refractive index change on waveguide surface. For the fabricated waveguide with a 40-nm-thick TiO2 film, experiment results showed that the minimum detectable index change was 5.9x10(-7).
authors: Department of Electronic Engineering, Kwangwoon University, Seoul, South Korea.
authors: Geun-Sik
authors: GS
authors: Son
authors: Woo-Kyung
authors: WK
authors: Kim
authors: Woo-Seok
authors: WS
authors: Yang
authors: Hyung-Man
authors: HM
authors: Lee
authors: Han-Young
authors: HY
authors: Lee
authors: Sung-Dong
authors: SD
authors: Lee
authors: Woo-Jin
authors: WJ
authors: Jeong
authors: Soon-Woo
authors: SW
authors: Kwon
authors: Ye-na
authors: YN
authors: Kim
authors: Sang-Shin
authors: SS
authors: Lee
mesh_terms: D001718:Birefringence; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods*; D012399:Rotation; D013499:Surface Properties; D014025:Titanium
chemical_list: C009495:titanium dioxide; D014025:Titanium