Coupled-Resonator Optical Near-Field Lithography (2008)
Tsang, Mankei, Psaltis, Demetri
The problem of pattern formation in resonantly-enhanced near-field lithography by the use of dielectric or plasmonic planar resonators is investigated. Sub-diffraction-limited bright or dark spots...
Harmonic holography: a new holographic principle (2008)
Pu, Ye, Centurion, Martin, Psaltis, Demetri
The process of second harmonic generation (SHG) has a unique property of forming a sharp optical contrast between noncentrosymmetric crystalline materials and other types of material, which is a...
Magnifying perfect lens and superlens design by coordinate transformation (2008)
Tsang, Mankei, Psaltis, Demetri
The coordinate transformation technique is applied to the design of perfect lenses and superlenses. In particular, anisotropic metamaterials that magnify two-dimensional planar images beyond the...
Heng, Xin, Hsiao, Edward, Psaltis, Demetri, Yang, Changhuei
We report a novel grid based Optofluidic Microscope (OFM) method where a closely spaced 2D grid of nanoapertures (diameter = 100 nm, separation = 2.5 μm) provided patterned illumination. We achieved...
Optical parametric generation in periodically poled KTiOPO4 via extended phase matching (2007)
Pu, Ye, Wu, Jie, Tsang, Mankei, Psaltis, Demetri
We report an experimental demonstration of optical parametric generation in a periodically poled KTiOPO4 crystal based on the principle of mirrorless optical parametric oscillation. A femtosecond...
Theory of resonantly enhanced near-field imaging (2007)
Tsang, Mankei, Psaltis, Demetri
We investigate the fundamental issues of power transfer and far-field retrieval of subwavelength information in resonantly enhanced near-field imaging systems. It is found that high-quality resonance...
Magnifying perfect lens and superlens design by coordinate transformation (2007)
Tsang, Mankei, Psaltis, Demetri
The coordinate transformation technique is applied to the design of perfect lenses and superlenses. In particular, anisotropic metamaterials that magnify two-dimensional planar images beyond the...
Nanoimprinted circular grating distributed feedback dye laser (2007)
Chen, Yan, Li, Zhenyu, Zhang, Zhaoyu, Psaltis, Demetri, Scherer, Axel
The authors demonstrate an optically pumped surface emitting polymer dye laser fabricated by nanoimprint lithography. The laser is based on an organic dye hosted within a poly(methylmethacrylate)...
Modulational instability in nonlinearity-managed optical media (2007)
Centurion, Martin, Porter, Mason A., Pu, Ye, Kevrekidis, P. G., Frantzeskakis, D. J., Psaltis, Demetri
We investigate analytically, numerically, and experimentally the modulational instability in a layered, cubically nonlinear (Kerr) optical medium that consists of alternating layers of glass and air....
Optofluidic Distributed Feedback Dye Lasers (2007)
We review our recent work on poly(dimethylsiloxane) (PDMS)-based optofluidic dye lasers using a guided wave distributed feedback (DFB) cavity. We show experimental results of single-mode operation,...
Trapping and storage of particles in electroactive microwells (2007)
Cordovez, Bernardo, Psaltis, Demetri, Erickson, David
The authors describe electroactive microwells which exploit highly localized electrokinetic effects in order to actively concentrate, confine, store, and reject particles in well defined geometries....
Modulational Instability in a Layered Kerr Medium: Theory and Experiment (2006)
Centurion, Martin, Porter, Mason A., Pu, Ye, Kevrekidis, P. G., Frantzeskakis, D. J., Psaltis, Demetri
We present the first experimental investigation of modulational instability in a layered Kerr medium. The particularly interesting and appealing feature of our configuration, consisting of...
Modulational Instability in Nonlinearity-Managed Optical Media (2006)
Centurion, Martin, Porter, Mason A., Pu, Ye, Kevrekidis, P. G., Frantzeskakis, D. J., Psaltis, Demetri
We investigate analytically, numerically, and experimentally the modulational instability in a layered, cubically-nonlinear (Kerr) optical medium that consists of alternating layers of glass and air....
Cui, Xiquan, Heng, Xin, Wu, Jigang, Yaqoob, Zahid, Scherer, Axel, Psaltis, Demetri, ...
We demonstrate a novel high-resolution portable beam profiler based on a slanted linear array of small apertures, termed a slanted hole array beam profiler (SHArP). The apertures are directly...
Mechanically tunable optofluidic distributed feedback dye laser (2006)
Li, Zhenyu, Zhang, Zhaoyu, Scherer, Axel, Psaltis, Demetri
A continuously tunable optofluidic distributed feedback (DFB) dye laser was demonstrated on a monolithic replica molded poly(dimethylsiloxane) (PDMS) chip. The optical feedback was provided by a...
Characterization of light collection through a subwavelength aperture from a point source (2006)
Heng, Xin, Cui, Xiquan, Knapp, David W., Wu, Jigang, Yaqoob, Zahid, McDowell, Emily J., ...
We experimentally measure and theoretically model the light transmission characteristics of subwavelength apertures. The characterization consists of translating a point source at varying vertical...
Optical detection of asymmetric bacteria utilizing electro orientation (2006)
Choi, Jae-Woo, Pu, Allen, Psaltis, Demetri
We propose a bacterial detection scheme which uses no biochemical markers and can be applied in a Point-of-Care setting. The detection scheme aligns asymmetric bacteria with an electric field and...
Reflectionless evanescent-wave amplification by two dielectric planar waveguides (2006)
Tsang, Mankei, Psaltis, Demetri
Utilizing the underlying physics of evanescent-wave amplification by a negative-refractive-index slab, it is shown that evanescent waves with specific spatial frequencies can also be amplified...
Holographic capture of femtosecond pulse propagation (2006)
Centurion, Martin, Pu, Ye, Psaltis, Demetri
We have implemented a holographic system to study the propagation of femtosecond laser pulses with high temporal (150 fs) and spatial resolutions (4 µm). The phase information in the holograms...
Modulational instability in a layered Kerr medium: Theory and Experiment (2006)
Centurion, Martin, Porter, Mason A., Pu, Ye, Kevrekidis, P. G., Frantzeskakis, D. J., Psaltis, Demetri
We present the first experimental investigation of modulational instability in a layered Kerr medium. The particularly interesting and appealing feature of our configuration, consisting of...
Nonlinearity Management in Optics: Experiment, Theory, and Simulation (2006)
Centurion, Martin, Porter, Mason A., Kevrekidis, P. G., Psaltis, Demetri
We conduct an experimental investigation of nonlinearity management in optics using femtosecond pulses and layered Kerr media consisting of glass and air. By examining the propagation properties over...
Beam-width-dependent filtering properties of strong volume holographic gratings (2006)
Hsieh, Hung-Te, Liu, Wenhai, Havermeyer, Frank, Moser, Christophe, Psaltis, Demetri
The finite dimension of the incident beam used to read out volume holographic gratings has interesting effects on their filtering properties. As the readout beam gets narrower, there is more...
Metaphoric optical computing of fluid dynamics (2006)
Tsang, Mankei, Psaltis, Demetri
We present theoretical and numerical evidence to show that self-defocusing nonlinear optical propagation can be used to compute Euler fluid dynamics and possibly Navier-Stokes fluid dynamics. In...
Nonlinearity Management in Optics: Experiment, Theory, and Simulation (2006)
Centurion, Martin, Porter, Mason A., Kevrekidis, P. G., Psaltis, Demetri
We conduct an experimental investigation of nonlinearity management in optics using femtosecond pulses and layered Kerr media consisting of glass and air. By examining the propagation properties over...
Reflectionless evanescent-wave amplification by two dielectric planar waveguides (2006)
Tsang, Mankei, Psaltis, Demetri
Utilizing the underlying physics of evanescent wave amplification by a negative-refractive-index slab, it is shown that evanescent waves with specific spatial frequencies can also be amplified...
Propagation of temporal entanglement (2006)
Tsang, Mankei, Psaltis, Demetri
The equations that govern the temporal evolution of two photons in the Schr{\"o}dinger picture are derived, taking into account the effects of loss, group-velocity dispersion, temporal phase...
Holographic grating formation in a colloidal suspension of silver nanoparticles (2006)
Adleman, James R., Eggert, Helge A., Buse, Karsten, Psaltis, Demetri
Holographic gratings are recorded in colloidal suspensions of silver nanoparticles by utilizing interfering nanosecond pulses. The diffraction efficiency is measured with continuous-wave light. An...
Single mode optofluidic distributed feedback dye laser (2006)
Li, Zhenyu, Zhang, Zhaoyu, Emery, Teresa, Scherer, Axel, Psaltis, Demetri
Single frequency lasing from organic dye solutions on a monolithic poly(dimethylsiloxane) (PDMS) elastomer chip is demonstrated. The laser cavity consists of a single mode liquid core/PDMS cladding...
Nanofluidic tuning of photonic crystal circuits (2006)
Erickson, David, Rockwood, Troy, Emery, Teresa, Scherer, Axel, Psaltis, Demetri
By integrating soft-lithography-based nanofluidics with silicon nanophotonics, we demonstrate dynamic, liquid-based addressing and high Delta n/n(~0.1) refractive index modulation of individual...
Propagation of temporal entanglement (2006)
Tsang, Mankei, Psaltis, Demetri
The equations that govern the temporal evolution of two photons in the Schrödinger picture are derived, taking into account the effects of loss, group-velocity dispersion, temporal phase modulation,...
Diffraction from deformed volume holograms: perturbation theory approach (2005)
Tian, Kehan, Cuingnet, Thomas, Li, Zhenyu, Liu, Wenhai, Psaltis, Demetri, Barbastathis, George
We derive the response of a volume grating to arbitrary small deformations, using a perturbative approach. This result is of interest for two applications: (a) when a deformation is undesirable and...
Femtosecond holography in lithium niobate crystals (2005)
Hsieh, Hung-Te, Psaltis, Demetri, Beyer, Oliver, Maxein, Dominik, Von Korff Schmising, Clemens, Buse, Karsten, ...
Spatial gratings are recorded holographically by two femtosecond pump pulses at 388 nm in lithium niobate (LiNbO3) crystals and read out by a Bragg-matched, temporally delayed probe pulse at 776 nm....
Self-organization of spatial solitons (2005)
Centurion, Martin, Pu, Ye, Psaltis, Demetri
We present experimental results on the transverse modulation instability of an elliptical beam propagating in a bulk nonlinear Kerr medium, and the formation and self-organization of spatial...
Holography in commercially available photoetchable glasses (2005)
Kösters, Michael, Hsieh, Hung-Te, Psaltis, Demetri, Buse, Karsten
Volume holographic gratings are recorded and retrieved in two commercially available glasses: Schott Foturan and Hoya PEG3. These materials are photoetchable, which describes their major application,...
Enhanced temporal resolution in femtosecond dynamic-grating experiments (2005)
Hsieh, Hung-Te, Psaltis, Demetri, Beyer, Oliver, Maxein, Dominik, Buse, Karsten, Sturman, Boris
Recording of gratings by interference of two pump pulses and diffraction of a third probe pulse is useful for investigating ultrafast material phenomena. We demonstrate, in theory and experiment,...
Dynamics of filament formation in a Kerr medium (2005)
Centurion, Martin, Pu, Ye, Tsang, Mankei, Psaltis, Demetri
We have studied the large-scale beam breakup and filamentation of femtosecond pulses in a Kerr medium. We have experimentally monitored the formation of stable light filaments, conical emission, and...
Spontaneous spectral phase conjugation for coincident frequency entanglement (2005)
Tsang, Mankei, Psaltis, Demetri
Spontaneous parametric processes pumped transversely with short pulses are studied under a unified framework, which proves that such processes can efficiently generate entangled photon pairs with...
A microfluidic 2×2 optical switch (2004)
Campbell, Kyle, Groisman, Alex, Levy, Uriel, Pang, Lin, Mookherjea, Shayan, Psaltis, Demetri, ...
A 2×2 microfluidic-based optical switch is proposed and demonstrated. The switch is made of an optically clear silicon elastomer, Polydimethylsiloxane (PDMS), using soft lithography. It has...
Liquid-crystal electric tuning of a photonic crystal laser (2004)
Maune, Brett, Lončar, Marko, Witzens, Jeremy, Hochberg, Michael, Baehr-Jones, Thomas, Psaltis, Demetri, ...
An electrically tuned nematic liquid-crystal (LC) infiltrated photonic crystal (PC) laser is demonstrated. This PC laser represents an emerging class of nanoscale optical adaptive devices enabled by...
Volume Holographic Hyperspectral Imaging (2004)
Liu, Wenhai, Barbastathis, George, Psaltis, Demetri
A volume hologram has two degenerate Bragg-phase-matching dimensions and provides the capability of volume holographic imaging. We demonstrate two volume holographic imaging architectures and...
Spectral phase conjugation with cross-phase modulation compensation (2004)
Tsang, Mankei, Psaltis, Demetri
Spectral phase conjugation with short pump pulses in a third-order nonlinear material is analyzed in depth. It is shown that if signal amplification is considered, the conversion efficiency can be...
Holographic recording of laser-induced plasma (2004)
Centurion, Martin, Pu, Ye, Liu, Zhiwen, Psaltis, Demetri, Hänsch, Theodor W.
We report on a holographic probing technique that allows for measurement of free-electron distribution with fine spatial detail. Plasma is generated by focusing a femtosecond pulse in air. We also...
Holographic recording of laser-induced plasma (2004)
Centurion, Martin, Pu, Ye, Liu, Zhiwen, Psaltis, Demetri, Hänsch, Theodor W.
Reverse propagation of femtosecond pulses in optical fibers (2003)
Tsang, Mankei, Psaltis, Demetri, Omenetto, Fiorenzo G.
We present a numerical technique for reversing femtosecond pulse propagation in an optical fiber, such that given any output pulse it is possible to obtain the input pulse shape by numerically...
Dispersion and nonlinearity compensation by spectral phase conjugation (2003)
Tsang, Mankei, Psaltis, Demetri
We propose the use of spectral phase conjugation to compensate for dispersion of all orders, self-phase modulation, and self-steepening of an optical pulse in a fiber. Although this method cannot...
Photorefractive properties of lithium niobate crystals doped with manganese (2003)
Yang, Yunping, Psaltis, Demetri, Luennemann, Marc, Berben, Dirk, Hartwig, Ulrich, Buse, Karsten
The photorefractive properties of lithium niobate crystals doped with manganese (Mn) have been investigated. It is found that the effect of dark decay due to electron tunneling, which is the limiting...
Comparison of Transmission and the 90-Degree Holographic Recording Geometry (2003)
Yang, Yunping, Adibi, Ali, Psaltis, Demetri
We compare the system performances of two holographic recording geometries using iron-doped lithium niobate: the 90-degree and transmission geometry. We find that transmission geometry is better...
Folded shift multiplexing (2003)
Moser, Christophe, Liu, Wenhai, Fainman, Yeshaiahu, Psaltis, Demetri
Shift multiplexing is a holographic recording method that uses a spherical reference wave. We extend the principle to a thin slab of holographic material that acts as a waveguide. Total internal...
Effect of the oxidation state of LiNbO3 :Fe on the diffraction (2003)
Geoffrey W. Burr, Demetri Psaltis
reference and the signal beams enter orthogonal crystal faces. A photorefractive crystal is typically used to store the resulting interference pattern. For short exposures, the local permittivity...
System Metric for Holographic Memory Systems (2003)
Fai H. Mok, Geoffrey W. Burr, Demetri Psaltis
e holograms are to be recorded, we calculate the proper set of exposure times by assuming that each hologram evolves during recording as A 0 f1 2 exps2tyt r dg sA 0 yt r dt and decays during erasure...
Dark decay of holograms in photorefractive polymers (2002)
Bittner, Reinhard, Meerholz, Klaus, Steckman, Gregory, Psaltis, Demetri
The decay of holograms stored in photorefractive polymer composites based on poly(N-vinyl-carbazole) with and without extrinsic deep traps is investigated. The photorefractive phase shift is...
Real-time spectral imaging in three spatial dimensions (2002)
Liu, Wenhai, Psaltis, Demetri, Barbastathis, George
We report what is to our knowledge the first volume-holographic optical imaging instrument with the capability to return three-dimensional spatial as well as spectral information about...
Real-time spectral imaging in three spatial dimensions (2002)
Liu, Wenhai, Psaltis, Demetri, Barbastathis, George
We report what is to our knowledge the first volume-holographic optical imaging instrument with the capability to return three-dimensional spatial as well as spectral information about...
Holographic recording of fast phenomena (2002)
Liu, Zhiwen, Steckman, Gregory J., Psaltis, Demetri
We report on a holographic method for recording fast events whose speed is limited by the laser pulse duration if the recording material has sufficient sensitivity to reliably record a frame of the...
Photorefractive recording in LiNbO3:Mn (2002)
Yang, Yunping, Buse, Karsten, Psaltis, Demetri
The dynamic range, sensitivity, and dark decay of holographic recording of wavelength 458nm in LiNbO3 crystals doped with 0.2-at.% Mn with different oxidation states have been measured. The measured...
Holographic recording of fast events on a CCD camera (2002)
Liu, Zhiwen, Centurion, Martin, Panotopoulos, George, Hong, John, Psaltis, Demetri
We report on holographic recording of nanosecond events on a conventional CCD camera. Three frames of an air-discharge event, with resolution of 5.9 ns and frame interval of 12 ns, are recorded in a...
Holographic recording of fast events on a CCD camera (2002)
Liu, Zhiwen, Centurion, Martin, Panotopoulos, George, Hong, John, Psaltis, Demetri
We report on holographic recording of nanosecond events on a conventional CCD camera. Three frames of an air-discharge event, with resolution of 5.9 ns and frame interval of 12 ns, are recorded in a...
Adibi, Ali, Buse, Karsten, Psaltis, Demetri
We define a measure for persistence in holographic recording. Using this measure and the known measures for dynamic range and sensitivity, we compare the performance of singly-doped and doubly-doped...
Holographic memory with localized recording (2001)
Moser, Christophe, Psaltis, Demetri
We experimentally demonstrate and characterize a memory module that features selective page erasure and readout persistence using the localized recording method in doubly doped LiNbO3. Pages of...
Storage Density of Shift-Multiplexed Holographic Memory (2001)
Steckman, Gregory J., Pu, Allen, Psaltis, Demetri
The storage density of shift-multiplexed holographic memory is calculated and compared with experimentally achieved densities by use of photorefractive and write-once materials. We consider...
Ionic and electronic dark decay of holograms in LiNbO3:Fe crystals (2001)
Yang, Yunping, Nee, Ingo, Buse, Karsten, Psaltis, Demetri
The lifetimes of nonfixed holograms in LiNbO3:Fe crystals with doping levels of 0.05, 0.138, and 0.25 wt % Fe2O3 have been measured in the temperature range from 30 to 180 °C. The time constants of...
Two-center holographic recording (2001)
Adibi, Ali, Buse, Karsten, Psaltis, Demetri
We describe a two-center holographic recording method for the storage of persistent holograms in doubly doped lithium niobate crystals. We use a two-center model, and we show that our experimental...
Measuring and modeling optical diffraction from subwavelength features (2001)
Wang, Xu, Mason, Jeffrey, Latta, Milton, Strand, Timothy C., Marx, David, Psaltis, Demetri
We describe a technique for studying scattering from subwavelength features. A simple scatterometer was developed to measure the scattering from the single-submicrometer, subwavelength features...
Theoretical analysis of two-step holographic recording with high-intensity pulses (2001)
Adibi, Ali, Buse, Karsten, Psaltis, Demetri
We develop a full numerical as well as an approximate analytic solution for two-step holographic recording with high intensity pulses in LiNbO3:Fe crystals. We find the unknown material parameters by...
Diffraction efficiency of localized holograms in doubly doped LiNbO3 crystals (2000)
Moser, Christophe, Maravic, Irena, Schupp, Benjamin, Adibi, Ali, Psaltis, Demetri
The diffraction efficiency of M holograms superimposed in the volume of the recording medium is proportional to 1/M^2. We present a method, based on nondestructive localized holograms in a doubly...
Holographic recording in a photopolymer by optically induced detachment of chromophores (2000)
Steckman, Gregory J., Shelkovnikov, Vladimir, Berezhnaya, Victoria, Gerasimova, Tatiana, Solomatine, Iouri, Psaltis, Demetri
We demonstrate holographic recording in a new photopolymer system. The recording material is created by copolymerization of an optically inert monomer, methyl methacrylate, and a second monomer that...
Sensitivity improvement in two-center holographic recording (2000)
Adibi, Ali, Buse, Karsten, Psaltis, Demetri
Persistent holograms are recorded with green light in LiNbO3 crystals doped with Mn and Fe. The recording sensitivity is 20 times better than that obtained by recording with red light. Partial loss...
Localized holographic recording in doubly doped lithium niobate (2000)
Moser, Christophe, Schupp, Benjamin, Psaltis, Demetri
Persistent holograms are recorded locally with red light in a LiNbO>3 crystal doped with Mg and Fe. Selective erasure is realized by use of a focused UV sensitizing light. We demonstrate the...
Pixel size limit in holographic memories (1999)
The bandwidth of holographic recording in LiNbO3 (Fe doped) in the 90° geometry is studied theoretically and experimentally. The wide holographic bandwidth of LiNbO3 makes it possible to record...
Pixel size limit in holographic memories (1999)
The bandwidth of holographic recording in LiNbO3 (Fe doped) in the 90° geometry is studied theoretically and experimentally. The wide holographic bandwidth of LiNbO3 makes it possible to record...
Secondary Grating Formation by Readout at Bragg-null Incidence (1999)
Adibi, Ali, Mumbru, Jose, Wagner, Kelvin, Psaltis, Demetri
We show that when a dynamic hologram is read out by illumination at the Bragg nulls of a previously recorded grating the diffracted beam inside the medium can result in the recording of two secondary...
Multiplexing holograms in LiNbO3FeMn crystals (1999)
Adibi, Ali, Buse, Karsten, Psaltis, Demetri
Persistent holograms are recorded with red light in lithium niobate crystals doped with manganese and iron. Different erasure mechanisms are investigated, and a recording schedule for multiplexing...