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Demetri Psaltis

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Related publications (271)

Surface optofluidics

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

Imaging based optofluidic air flow meter with polymer interferometers defined by soft lithography

Demetri Psaltis, Wuzhou Song

We present an optofluidic chip with integrated polymer interferometers for measuring both the microfluidic air pressure and flow rate. The chip contains a microfluidic circuit and optical cavities on a polymer which was defined by soft lithography. The pre ...

2010

Coherent anti-stokes Raman holography for chemically selective single-shot nonscanning 3D imaging

Demetri Psaltis, Kun Shi, Ho Ling Li

We propose and develop a new way for nonscanning coherent anti-Stokes Raman scattering (CARS) imaging by using CARS holography, which can capture, at a single shot, both the amplitude and the phase of a coherent Raman image. It hence allows for chemically ...

2010

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

Samuel Rosset, Muhamed Niklaus, Herbert Shea, Demetri Psaltis, 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

All-optical switching in an optofluidic polydimethylsiloxane: Liquid crystal grating defined by cast-molding

Julien Cuennet, Demetri Psaltis, Andreas Vasdekis, Luciano De Sio

We report an optofluidic photoswitchable grating, based on a polydimethylsiloxane periodic structure on a glass substrate, separated by a thin liquid crystal film. The polydimethylsiloxane microstructure was realized via high resolution replica molding and ...

2010

Digital phase conjugation of second harmonic radiation emitted by nanoparticles in turbid media

Rachel Grange, Demetri Psaltis, Chia-Lung Hsieh, Ye Pu, Ye Pu

We demonstrate focusing coherent light on a nanoparticle through turbid media based on digital optical phase conjugation of second harmonic generation (SHG) field from the nanoparticle. A SHG active nanoparticle inside a turbid medium was excited at the fu ...

2010

Inline holographic coherent anti-Stokes Raman microscopy

Demetri Psaltis, Kun Shi, Ho Ling Li

We demonstrate a simple approach for inline holographic coherent anti-Stokes Raman scattering (CARS) microscopy, in which a layer of uniform nonlinear medium is placed in front of a specimen to be imaged. The reference wave created by four-wave mixing in t ...

2010

Harmonic Holography

Rachel Grange, Demetri Psaltis, Chia-Lung Hsieh, Ye Pu, Ye Pu

2010

Heterogenous catalysis mediated by plasmon heating

Demetri Psaltis, James Adleman

We introduce a new method for performing and miniaturizing many types of heterogeneous catalysis involving nanoparticles. The method makes use of the plasmon resonance present in nanoscale metal catalysts to provide the necessary heat of reaction when illu ...

2009

Second harmonic generating (SHG) Nanoprobes: A new tool for biomedical imaging

Demetri Psaltis, Ye Pu, Ye Pu

Cornea functions as an outermost lens and plays an important role in vision. For cornea diagnosis and treatment, a microscopic imaging system with cellular resolution and high eye safety is strongly desired. Recently, the cell morphology of corneal epithel ...

2009

Lithium niobate nanowires: Growth, second-harmonic and dielectrophoretic properties

László Forró, Rachel Grange, Arnaud Magrez, Demetri Psaltis, Jae-Woo Choi, Chia-Lung Hsieh, Ye Pu, Ye Pu

2009

Novel tuning method for optofluidics

Demetri Psaltis, Wuzhou Song

We introduce a novel tuning mechanism for optofluidic devices by embedding pressure driven actuator inside microfluidic chips. Multiple tunable optofluidic devices remotely controlled by the pressure of air or liquid were demonstrated. ...

Ieee Service Center2009

Harmonic holographic microscopy with circularly polarized excitation

Rachel Grange, Demetri Psaltis, Chia-Lung Hsieh, Ye Pu, Ye Pu

We have developed a luminescent marker using the second harmonic generation (SHG) from noncentrosymmetric BaTiO3 nanocrystals. These nanoparticles are attractive due to their stable, non-saturating and coherent signal with a femtosecond-scale response time ...

2009

Micro-Air-Bag Actuated Tunable Optofluidic Elements

Demetri Psaltis, Jae-Woo Choi, Andreas Vasdekis, Wuzhou Song

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

Three-dimensional harmonic holographic microcopy using nanoparticles as probes for cell imaging

Rachel Grange, Demetri Psaltis, Chia-Lung Hsieh, Ye Pu, Ye Pu

Luminescent markers play a key role in imaging techniques for life science since they provide a contrast mechanism between signal and background. We describe a new type of marker using second harmonic generation (SHG) from noncentrosymmetric BaTiO3 nanocry ...

Optical Society of America2009

Lithium niobate nanowires synthesis, optical properties, and manipulation

László Forró, Rachel Grange, Arnaud Magrez, Demetri Psaltis, Jae-Woo Choi, Chia-Lung Hsieh, Rita Smajda, Ye Pu, Ye Pu

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

Barium titanate nanoparticles used as second harmonic radiation imaging probes for cell imaging

Rachel Grange, Demetri Psaltis, Chia-Lung Hsieh, Ye Pu, Ye Pu

2009

Ultrasensitive second harmonic generation nanoprobes via plasmonic coreshell structures

Rachel Grange, Demetri Psaltis, Chia-Lung Hsieh, Ye Pu, Ye Pu

2009

Low-order distributed feedback optofluidic dye laser with reduced threshold

Demetri Psaltis, Andreas Vasdekis, Wuzhou Song

We report the demonstration of low order distributed feedback (DFB) optofluidic dye lasers with reduced threshold. The laser chips were realized in polydimethylsiloxane using replica molding with two masters. A comparison between first, second, and third o ...

2009

Bacteria manipulation with optically controlled fluidic valves

Demetri Psaltis, Jae-Woo Choi, James Adleman

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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