TY - JOUR
T1 - Phase contrast imaging using photothermally induced phase transitions in liquid crystals
AU - Yelleswarapu, Chandra S.
AU - Kothapalli, Sri Rajasekhar
AU - Aranda, Francisco J.
AU - Rao, D. V.G.L.N.
AU - Vaillancourt, Yvonne R.
AU - Kimball, Brian R.
N1 - Funding Information:
The authors would like to thank Bin Wang of Liquid Crystal Institute, Kent State University, for the liquid crystal cells. The authors are indebted to Bala Sundaram for helpful discussions. Grateful thanks are due to William Hagar for critically reading the letter. This research is supported in part by a BAA Contract No. W911QY-04-C-0063 from U.S. Army Natick Soldier Center.
PY - 2006
Y1 - 2006
N2 - Phase contrast imaging is performed for live biological species using photothermal induced birefringence in dye doped liquid crystals. Using typical 4-f configuration, when liquid crystal cell is at back focal plane of Fourier lens, low spatial frequencies at center of Fourier spectrum are intense enough to induce local liquid crystal molecules into isotropic phase, whereas high spatial frequencies on the edges are not intense enough and remain in anisotropic phase. This results in π 2 phase difference between high and low spatial frequencies. This simple, inexpensive, all-optical, user-friendly, self-adaptive phase contrast imaging technique using low-power laser offers several distinct advantages.
AB - Phase contrast imaging is performed for live biological species using photothermal induced birefringence in dye doped liquid crystals. Using typical 4-f configuration, when liquid crystal cell is at back focal plane of Fourier lens, low spatial frequencies at center of Fourier spectrum are intense enough to induce local liquid crystal molecules into isotropic phase, whereas high spatial frequencies on the edges are not intense enough and remain in anisotropic phase. This results in π 2 phase difference between high and low spatial frequencies. This simple, inexpensive, all-optical, user-friendly, self-adaptive phase contrast imaging technique using low-power laser offers several distinct advantages.
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U2 - 10.1063/1.2397030
DO - 10.1063/1.2397030
M3 - Article
AN - SCOPUS:33845385572
SN - 0003-6951
VL - 89
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 21
M1 - 211116
ER -