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Jae-Woo Choi

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Related publications (22)

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Second harmonic nanoparticles in imaging applications

Demetri Psaltis, Ioannis Papadopoulos, Ye Pu, Rachel Grange, Chia-Lung Hsieh, Jae-Woo Choi, Xin Yang

Nanocrystals with second harmonic response is a new class of nonlinear optical nanoprobes with dramatically different properties from fluorescent agents. Compared with two-photon fluorescence, second harmonic generation is an ultrafast, lossless, and coher ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2011

Surface optofluidics

Demetri Psaltis, Andreas Vasdekis, Wuzhou Song, Jae-Woo Choi, Julien Cuennet, Luciano De Sio

Surfaces -defined as the interfaces between solids and liquids- have attracted much attention in optics and biology, such as total internal reflection imaging (TIRF) and DNA microarrays. Within the context of optofluidics however, surfaces have received li ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2010

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We report the hydrothermal synthesis of free-standing lithium niobate nanowires. We show that the versatile properties of bulk lithium niobate such as nonlinear optical effects can be exploited at the nanoscale. We describe the fabrication of polydimethyls ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2010

3-dimensional electrode patterning within a microfluidic channel using metal ion implantation

Demetri Psaltis, Herbert Shea, Samuel Rosset, Muhamed Niklaus, Jae-Woo Choi, James Adleman

The application of electrical fields within a microfluidic channel enables many forms of manipulation necessary for lab-on-a-chip devices. Patterning electrodes inside the microfluidic channel generally requires multi-step optical lithography. Here, we uti ...

Royal Society of Chemistry2010

Tuning Mechanisms in Optofluidics

Demetri Psaltis, Wuzhou Song, Jae-Woo Choi

Novel functionalities have been developed through the fusion of optics and microfluidics. We categorize the different possible tuning mechanisms in optofluidics and describe the recent examples in each category. (C)2010 Optical Society of America ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2010

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We demonstrate that lithium niobate nanowires generate electric fields under 514 nm continuous wave laser illumination. Birefringent media are used to visualize the generated fields in a microfluidic channel. Input laser polarization dependence is shown. ( ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2010

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Applying electrical fields is a simple and versatile method to manipulate and reconfigure optofluidic devices. Several methods to apply electric fields using electrodes on polymers or in the context of lab-on-a-chip devices exist. In this paper, we utilize ...

SPIE -Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2010

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Optically controlled fluidic valves are utilized to concentrate and detect bacteria, selectively switch the pathway of the bacteria, and demonstrate bidirectional fluidic flow within a microfluidic channel. (C) 2009 Optical Society of America ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

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Free-standing lithium niobate nanowires (LiNbO3) are synthesized by the hydrothermal route. The polarization response of the second harmonic generation (SHG) signal is measured in a single nanowire and used to identify the crystal orientation by matching w ...

2009

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We introduce for the first time a tuning mechanism for optofluidic devices by embedding a Micro-Air-Bag (MAB) actuator inside a microfluidic chip. Multiple tunable optical elements controlled through the pressure of compressed air were demonstrated. (C)200 ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009