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27 Mar 2006

Volume 88, Issue 13, Articles (13xxxx)

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Appl. Phys. Lett. 88, 133105 (2006); http://dx.doi.org/10.1063/1.2189203 (3 pages)

Premila Mohan, Junichi Motohisa, and Takashi Fukui
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Defocusing microscopy: An approach for red blood cell optics

Leonardo G. Mesquita, Ubirajara Agero, and Oscar N. Mesquita

Appl. Phys. Lett. 88, 133901 (2006); http://dx.doi.org/10.1063/1.2189010 (3 pages) | Cited 8 times

Online Publication Date: 29 March 2006

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Thin transparent objects (phase objects) can become visible in a bright-field light microscope, if the microscope is slightly defocused. Thick transparent objects, like red blood cells (RBC), are seen because some of their parts are always out of focus. By applying our recently developed defocusing microscopy technique to RBC, we are able to interpret RBC bright-field light microscopy images, an old standing problem. From the average image contrast we obtain RBC shape, size, and refractive index. From contrast fluctuations caused by the flicker phenomenon, we obtain RBC bending modulus and cytoplasm viscosity.
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87.64.M- Optical microscopy
87.17.-d Cell processes

Cladding mode resonances of etch-eroded fiber Bragg grating for ambient refractive index sensing

Na Chen, Binfeng Yun, and Yiping Cui

Appl. Phys. Lett. 88, 133902 (2006); http://dx.doi.org/10.1063/1.2191951 (3 pages) | Cited 12 times

Online Publication Date: 31 March 2006

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In this Letter, the cladding mode resonances of a chemical etch-eroded fiber Bragg grating are proposed for highly sensitive ambient refractive index sensing. The varying characteristics of several different order cladding mode resonances with ambient refractive index are explored experimentally. The maximum sensing sensitivity of 172 nm/riu for the third-order cladding mode resonance is achieved in the experiments. Under the same cladding diameter, the cladding mode resonances have narrower bandwidth and response much more sensitive to the ambient refractive index changing than conventional Bragg core mode resonance, which would enable them to achieve a higher resolution.
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42.81.Pa Sensors, gyros
42.79.Dj Gratings
42.81.Wg Other fiber-optical devices
42.81.Bm Fabrication, cladding, and splicing
07.60.Hv Refractometers and reflectometers
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