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6 Sep 2004

Volume 85, Issue 10, pp. 1659-1861

Issue Cover Spotlight Figure

Appl. Phys. Lett. 85, 1793 (2004); http://dx.doi.org/10.1063/1.1790588 (3 pages)

Hyunsik Yoon, Kyoung Mi Lee, Dahl-Young Khang, Hong H. Lee, and Se-Jin Choi
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Phase-resolved optical Doppler tomography for imaging flow dynamics in microfluidic channels

Lei Wang, Wei Xu, Mark Bachman, G. P. Li, and Zhongping Chen

Appl. Phys. Lett. 85, 1855 (2004); http://dx.doi.org/10.1063/1.1785854 (3 pages) | Cited 8 times

Online Publication Date: 13 September 2004

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Phase-resolved optical Doppler tomography (ODT), an imaging technique based on low coherence interferometry, is presented as a tool to perform high-resolution cross-sectional imaging of fluidic flow in microchannels with high velocity sensitivity. To demonstrate ODT as a tool, electro-osmotic flow (EOF) was investigated, observing cross-sectional images of bidirectional flow within a microfluidic channel and pulsating flow when driven by a pulsed electrical field. ODT demonstrates great promise as a tool for studying the effects of microchannel surface modifications on biological sample flow and optimizing microfluidic device design.
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47.85.Np Fluidics
42.30.Wb Image reconstruction; tomography
47.60.-i Flow phenomena in quasi-one-dimensional systems
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices

Microwave photonic crystal with tailor-made negative refractive index

P. Vodo, P. V. Parimi, W. T. Lu, S. Sridhar, and R. Wing

Appl. Phys. Lett. 85, 1858 (2004); http://dx.doi.org/10.1063/1.1787959 (3 pages) | Cited 17 times

Online Publication Date: 13 September 2004

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Negative refraction and left-handed electromagnetism in a metallic photonic crystal (PC) wedge are demonstrated in free space for both transverse magnetic and electric mode propagation. The experimental results are in excellent agreement with numerical calculations based on the band structure with no fit parameters used in modeling. The results demonstrate precision control on the design and fabrication of the PC to achieve tailor-made refractive indices between −0.6 and +1.
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42.70.Qs Photonic bandgap materials
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
41.20.Jb Electromagnetic wave propagation; radiowave propagation
84.40.-x Radiowave and microwave (including millimeter wave) technology
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