362 Works

Darkfield orthogonal polarized spectral imaging for studying endovascular laser-tissue interactions in vivo-a preliminary study

Michal Heger, Johan F. Beek, Karin Stenback, Dirk J. Faber, Martin J.C. Van Gemert & Can Ince
Due to the limited number of suitable intravital microscopy techniques, relatively little is known about the opto-thermal (endo)vascular responses to selective photothermolysis, used as a default treatment modality for superficial vascular anomalies such as port wine stains, telangiectasias, and hemangiomas. In this preliminary study we present a novel microscopy technique for studying (endo)vascular laser-tissue interactions in vivo, in which conventional orthogonal polarized spectral (OPS) imaging is combined with darkfield (DF) illumination. DFOPS imaging of rat...

Darkfield orthogonal polarized spectral imaging for studying endovascular laser-tissue interactions in vivo-a preliminary study

Michal Heger, Johan F. Beek, Karin Stenback, Dirk J. Faber, Martin J.C. Van Gemert & Can Ince
Due to the limited number of suitable intravital microscopy techniques, relatively little is known about the opto-thermal (endo)vascular responses to selective photothermolysis, used as a default treatment modality for superficial vascular anomalies such as port wine stains, telangiectasias, and hemangiomas. In this preliminary study we present a novel microscopy technique for studying (endo)vascular laser-tissue interactions in vivo, in which conventional orthogonal polarized spectral (OPS) imaging is combined with darkfield (DF) illumination. DFOPS imaging of rat...

Observation of propagating femtosecond light pulse train generated by an integrated array illuminator as a spatially and temporally continuous motion picture

Masatomo Yamagiwa, Aya Komatsu, Yasuhiro Awatsuji & Toshihiro Kubota
We observed a propagating femtosecond light pulse train generated by an integrated array illuminator as a spatially and temporally continuous motion picture. To observe the light pulse train propagating in air, light-in-flight holography is applied. The integrated array illuminator is an optical device for generating an ultrashort light pulse train from a single ultrashort pulse. The experimentally obtained pulse width and pulse interval were 130 fs and 19.7 ps, respectively. A back-propagating femtosecond light pulse...

Observation of propagating femtosecond light pulse train generated by an integrated array illuminator as a spatially and temporally continuous motion picture

Masatomo Yamagiwa, Aya Komatsu, Yasuhiro Awatsuji & Toshihiro Kubota
We observed a propagating femtosecond light pulse train generated by an integrated array illuminator as a spatially and temporally continuous motion picture. To observe the light pulse train propagating in air, light-in-flight holography is applied. The integrated array illuminator is an optical device for generating an ultrashort light pulse train from a single ultrashort pulse. The experimentally obtained pulse width and pulse interval were 130 fs and 19.7 ps, respectively. A back-propagating femtosecond light pulse...

Calligraphic poling of Lithium Niobate

Makan Mohageg, Dmitry V. Strekalov, Anatoliy A. Savchenkov, Andrey B. Matsko, Vladimir S. Ilchenko & Lute Maleki
We demonstrate a novel technique for instituting complex and arbitrary shaped micron-scale domain patterns in LiNbO3 at room temperature. Fabrication of continuous domains as narrow as 2 µm across and hexagonal patterns of the same order accompanied by real time visualization of the poling process are presented.

Excitation strategies for optical lattice microscopy

Eric Betzig
Recently, new classes of optical lattices were identified, permitting the creation of arbitrarily large two- and three-dimensional arrays of tightly confined excitation maxima of controllable periodicity and polarization from the superposition of a finite set of plane waves. Here, experimental methods for the generation of such lattices are considered theoretically in light of their potential applications, including high resolution dynamic live cell imaging, photonic crystal fabrication, and quantum simulation and quantum computation using ultracold atoms.

Compact in-plane channel drop filter design using a single cavity with two degenerate modes in 2D photonic crystal slabs

Ziyang Zhang & Min Qiu
A compact in-plane channel drop filter design in 2D hexagonal lattice photonic crystal slabs is presented in this paper. The system consists of two photonic crystal waveguides and a single cavity with two degenerate modes. Both modes are able to confine light strongly in the vertical dimension and prove to couple equally into the waveguides. Three dimensional finite difference time domain simulations show that the quality factor is around 3,000. At resonance, power transferred to...

Compact in-plane channel drop filter design using a single cavity with two degenerate modes in 2D photonic crystal slabs

Ziyang Zhang & Min Qiu
A compact in-plane channel drop filter design in 2D hexagonal lattice photonic crystal slabs is presented in this paper. The system consists of two photonic crystal waveguides and a single cavity with two degenerate modes. Both modes are able to confine light strongly in the vertical dimension and prove to couple equally into the waveguides. Three dimensional finite difference time domain simulations show that the quality factor is around 3,000. At resonance, power transferred to...

Calligraphic poling of Lithium Niobate

Makan Mohageg, Dmitry V. Strekalov, Anatoliy A. Savchenkov, Andrey B. Matsko, Vladimir S. Ilchenko & Lute Maleki
We demonstrate a novel technique for instituting complex and arbitrary shaped micron-scale domain patterns in LiNbO3 at room temperature. Fabrication of continuous domains as narrow as 2 µm across and hexagonal patterns of the same order accompanied by real time visualization of the poling process are presented.

Excitation strategies for optical lattice microscopy

Eric Betzig
Recently, new classes of optical lattices were identified, permitting the creation of arbitrarily large two- and three-dimensional arrays of tightly confined excitation maxima of controllable periodicity and polarization from the superposition of a finite set of plane waves. Here, experimental methods for the generation of such lattices are considered theoretically in light of their potential applications, including high resolution dynamic live cell imaging, photonic crystal fabrication, and quantum simulation and quantum computation using ultracold atoms.

Near-field imaging of surface plasmon-polariton guiding in band gap structures at telecom wavelengths

Carsten Marquart, Sergey I. Bozhevolnyi & Kristjan Leosson
Using a collection near-field microscope, we image interaction of surface plasmon-polaritons (SPPs) excited locally at telecom wavelengths with periodic triangular arrays of gold bumps placed on gold film surfaces. We observe the inhibition of SPP propagation into the arrays within a certain wavelength range depending on their period and orientation, i.e., the band gap (BG) effect, as well as the SPP propagation along bent channels cut through these arrays. Prospects and challenges in realization of...

Helico-conical optical beams: a product of helical and conical phase fronts

Carlo Amadeo Alonzo, Peter John Rodrigo & Jesper Glückstad
Helico-conical optical beams, different from higher-order Bessel beams, are generated with a parallel-aligned nematic liquid crystal spatial light modulator (SLM) by multiplying helical and conical phase functions leading to a nonseparable radial and azimuthal phase dependence. The intensity distributions of the focused beams are explored in two- and three-dimensions. In contrast to the ring shape formed by a focused optical vortex, a helico-conical beam produces a spiral intensity distribution at the focal plane. Simple scaling...

Near-field imaging of surface plasmon-polariton guiding in band gap structures at telecom wavelengths

Carsten Marquart, Sergey I. Bozhevolnyi & Kristjan Leosson
Using a collection near-field microscope, we image interaction of surface plasmon-polaritons (SPPs) excited locally at telecom wavelengths with periodic triangular arrays of gold bumps placed on gold film surfaces. We observe the inhibition of SPP propagation into the arrays within a certain wavelength range depending on their period and orientation, i.e., the band gap (BG) effect, as well as the SPP propagation along bent channels cut through these arrays. Prospects and challenges in realization of...

Helico-conical optical beams: a product of helical and conical phase fronts

Carlo Amadeo Alonzo, Peter John Rodrigo & Jesper Glückstad
Helico-conical optical beams, different from higher-order Bessel beams, are generated with a parallel-aligned nematic liquid crystal spatial light modulator (SLM) by multiplying helical and conical phase functions leading to a nonseparable radial and azimuthal phase dependence. The intensity distributions of the focused beams are explored in two- and three-dimensions. In contrast to the ring shape formed by a focused optical vortex, a helico-conical beam produces a spiral intensity distribution at the focal plane. Simple scaling...

High-speed optical measurement for the drumhead vibration

Qican Zhang & Xianyu Su
A high-speed optical measurement for the vibrating drumhead is presented and verified by experiment. A projected sinusoidal fringe pattern on the measured drumhead is dynamically deformed with the membrane vibration and grabbed by a high-speed camera. The shape deformation of the drumhead at each sampling instant can be recovered from this sequence of obtained fringe patterns. The membrane vibration of Chinese drum has been measured with a high speed sampling rate of 1,000 frames/sec. and...

3D object scaling in integral imaging display by varying the spatial ray sampling rate

Yong-Wook Song, Bahram Javidi & Fushou Jin
In this paper, we present a method to scale (that is, to enlarge or reduce) three-dimensional integral images of objects. The scaling is achieved by controlling the spatial ray sampling rate of elemental images in the pickup procedure of the object. The sampling is obtained by using a moving array-lenslet technique (MALT) during the recording stage. In the display process, a stationary display lenslet array is used. The lateral and longitudinal magnifications obtained with the...

3D object scaling in integral imaging display by varying the spatial ray sampling rate

Yong-Wook Song, Bahram Javidi & Fushou Jin
In this paper, we present a method to scale (that is, to enlarge or reduce) three-dimensional integral images of objects. The scaling is achieved by controlling the spatial ray sampling rate of elemental images in the pickup procedure of the object. The sampling is obtained by using a moving array-lenslet technique (MALT) during the recording stage. In the display process, a stationary display lenslet array is used. The lateral and longitudinal magnifications obtained with the...

High-speed optical measurement for the drumhead vibration

Qican Zhang & Xianyu Su
A high-speed optical measurement for the vibrating drumhead is presented and verified by experiment. A projected sinusoidal fringe pattern on the measured drumhead is dynamically deformed with the membrane vibration and grabbed by a high-speed camera. The shape deformation of the drumhead at each sampling instant can be recovered from this sequence of obtained fringe patterns. The membrane vibration of Chinese drum has been measured with a high speed sampling rate of 1,000 frames/sec. and...

Visual axial PSF of diffractive trifocal lenses

Pedro J. Valle, José E. Oti, Vidal F. Canales & Manuel P. Cagigal
The ophthalmic applications of a diffractive trifocal lens design with adjustable add powers and light distribution in the foci are investigated. Axial PSFs of the trifocal lenses are calculated and analyzed as a function of the design parameters and the eye pupil size. The optical performance in actual eyes is also simulated by including the measured ocular wave aberration functions of human eyes in the calculation of transverse and axial PSFs, and Strehl ratio axial...

Visual axial PSF of diffractive trifocal lenses

Pedro J. Valle, José E. Oti, Vidal F. Canales & Manuel P. Cagigal
The ophthalmic applications of a diffractive trifocal lens design with adjustable add powers and light distribution in the foci are investigated. Axial PSFs of the trifocal lenses are calculated and analyzed as a function of the design parameters and the eye pupil size. The optical performance in actual eyes is also simulated by including the measured ocular wave aberration functions of human eyes in the calculation of transverse and axial PSFs, and Strehl ratio axial...

Nonlinear pulse propagation at zero dispersion wavelength in anti-resonant photonic crystal fibers

A. Fuerbach, P. Steinvurzel, J. A. Bolger & B. J. Eggleton
We experimentally and numerically investigate femtosecond pulse propagation in a microstructured optical fiber consisting of a silica core surrounded by air holes which are filled with a high index fluid. Such fibers have discrete transmission bands which exhibit strong dispersion arising from the scattering resonances of the high index cylinders. We focus on nonlinear propagation near the zero dispersion point of one of these transmission bands. As expected from theory, we observe propagation of a...

Nonlinear pulse propagation at zero dispersion wavelength in anti-resonant photonic crystal fibers

A. Fuerbach, P. Steinvurzel, J. A. Bolger & B. J. Eggleton
We experimentally and numerically investigate femtosecond pulse propagation in a microstructured optical fiber consisting of a silica core surrounded by air holes which are filled with a high index fluid. Such fibers have discrete transmission bands which exhibit strong dispersion arising from the scattering resonances of the high index cylinders. We focus on nonlinear propagation near the zero dispersion point of one of these transmission bands. As expected from theory, we observe propagation of a...

Hollow spheres as individual movable micromirrors in optical tweezers

I. Ricárdez-Vargas, M. D. Iturbe-Castillo, R. Ramos-García, K. Volke-Sepúlveda & V. Ruíz-Cortés
We introduce the use of hollow micron-sized spheres with a finite-thickness glass shell as individual micromirrors operating by total internal reflection (TIR) when illuminated off-axis. We also demonstrated that this kind of spheres can be optically trapped and manipulated in two dimensions using a Gaussian beam in a conventional optical tweezers setup, which allows the precise positioning of the micromirrors at specific locations within a sample cell. This mirrors constitutes a new micro-tool in the...

Real-time interactive 3D manipulation of particles viewed in two orthogonal observation planes

Ivan R. Perch-Nielsen, Peter John Rodrigo & Jesper Glückstad
The generalized phase contrast (GPC) method has been applied to transform a single TEM00 beam into a manifold of counterpropagating-beam traps capable of real-time interactive manipulation of multiple microparticles in three dimensions (3D). This paper reports on the use of low numerical aperture (NA), non-immersion, objective lenses in an implementation of the GPC-based 3D trapping system. Contrary to high-NA based optical tweezers, the GPC trapping system demonstrated here operates with long working distance (>10 mm),...

Real-time interactive 3D manipulation of particles viewed in two orthogonal observation planes

Ivan R. Perch-Nielsen, Peter John Rodrigo & Jesper Glückstad
The generalized phase contrast (GPC) method has been applied to transform a single TEM00 beam into a manifold of counterpropagating-beam traps capable of real-time interactive manipulation of multiple microparticles in three dimensions (3D). This paper reports on the use of low numerical aperture (NA), non-immersion, objective lenses in an implementation of the GPC-based 3D trapping system. Contrary to high-NA based optical tweezers, the GPC trapping system demonstrated here operates with long working distance (>10 mm),...

Resource Types

  • Collection
    362

Publication Year

  • 2005
    362