Dr. Jianzhao Li Profile

Dr. Jianzhao Li

Senior Research Scientist at Univ. of Toronto

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Author

Publications (21)

Proceedings Article | 5 March 2022 Presentation

Fiber-to-silicon photonics interposer for high-density vertical coupling through laser structured mirror-waveguide circuits

Gligor Djogo, Amir Rahimnouri, Jianzhao Li, Stephen Ho, Peter Herman

Proceedings Volume PC12007, PC120070H (2022) https://doi.org/10.1117/12.2609088

KEYWORDS: Waveguides, Photonics, Structured optical fibers, Optical fibers, Optical circuits, Mirrors, Glasses, Femtosecond phenomena, Chemical elements, Wet etching

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Proceedings Article | 30 March 2021 Presentation + Paper

From filaments to light-sheets: tailoring the spectrum of fiber Bragg gratings with femtosecond lasers

Polina Zavyalova, Abdullah Rahnama, Ehsan Alimohammadian, JianZhao Li, Suresh Sivanandam, Peter Herman

Proceedings Volume 11676, 116760X (2021) https://doi.org/10.1117/12.2585179

KEYWORDS: Fiber Bragg gratings, Femtosecond phenomena, Spatial light modulators, Cladding, Beam shaping, Waveguides, Telecommunications, Structured optical fibers, Spectrometers, Refractive index

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Proceedings Article | 30 March 2021 Presentation + Paper

Femtosecond laser welding of silica glass fiber for robust Bragg grating sensing in high temperature environment

Oleg Vorobyev, Young Hwan Kim, Jianzhao Li, Michael Bakaic, Nicholas Burgwin, Abdullah Rahnama, Peter Herman

Proceedings Volume 11676, 1167618 (2021) https://doi.org/10.1117/12.2584331

KEYWORDS: Glasses, Femtosecond phenomena, Fiber Bragg gratings, Environmental sensing, Silica, Laser welding, Bragg gratings, Packaging, Optical fibers, Sensors

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Proceedings Article | 7 March 2021 Presentation

Femtosecond laser micro-structuring of air-disk mirrors in glass for out-of-plane waveguide coupling in silicon photonic packaging

Gligor Djogo, Amir Rahimnouri, Stephen Ho, Jianzhao Li, Peter Herman

Proceedings Volume 11676, 116760S (2021) https://doi.org/10.1117/12.2581679

KEYWORDS: Mirrors, Waveguides, Glasses, Packaging, Silicon photonics, Femtosecond phenomena, Reflection, Etching, Wet etching, Waveguide lasers

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Proceedings Article | 10 March 2020 Presentation

Harnessing femtosecond laser filaments for nano-structuring of "Lab-in-Fibre" sensors and "Spectrometer-in-Fibre" microsystems (Conference Presentation)

Peter Herman, Ehsan Alimonhammadian, Keivan Aghdami, Erden Ertorer, Young Hwan Kim, Jianzhao Li, Abdullah Rahnama

Proceedings Volume 11292, 1129202 (2020) https://doi.org/10.1117/12.2551249

KEYWORDS: Femtosecond phenomena, Sensors, Spectroscopy, Microsystems

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Proceedings Article | 13 March 2019 Presentation

Direct laser writing of liquid metal grids for visually imperceptible stretchable electronics (Conference Presentation)

Kitty Kumar, Chengfeng Pan, Eric Markvicka, Jianzhao Li, Peter Herman, Carmel Majidi

Proceedings Volume 10905, 1090516 (2019) https://doi.org/10.1117/12.2510661

KEYWORDS: Visualization, Multiphoton lithography, Liquids, Metals, Stretchable circuits, Transmittance, Light sources and illumination, Robotics, Microfabrication, Resistance

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Proceedings Article | 21 April 2017 Presentation

Femtosecond filaments for rapid and flexible writing of Fiber-Bragg grating (Conference Presentation)

Erden Ertorer, Moez Haque, Jianzhao Li, Peter Herman

Proceedings Volume 10094, 1009415 (2017) https://doi.org/10.1117/12.2257545

KEYWORDS: Refractive index, Optical fibers, Cladding, Fiber Bragg gratings, Laser processing, Glasses, Laser glasses, Single mode fibers, Waveguides, Femtosecond phenomena

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Proceedings Article | 21 April 2017 Presentation

Manipulating femtosecond laser interactions in bulk glass and thin-film with spatial light modulation (Conference Presentation)

Ehsan Alimohammadian, Stephen Ho, Erden Ertorer, Sebastian Gherghe, Jianzhao Li, Peter Herman

Proceedings Volume 10094, 100940Z (2017) https://doi.org/10.1117/12.2255877

KEYWORDS: Modulation, Spatial light modulators, Thin films, Femtosecond phenomena, Glasses, Beam shaping, Waveguides, Optical tracking, Spherical lenses, Plasma

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Spatial Light Modulators (SLM) are emerging as a power tool for laser beam shaping whereby digitally addressed phase shifts can impose computer-generated hologram patterns on incoming laser light. SLM provide several additional advantages with ultrashort-pulsed lasers in controlling the shape of both surface and internal interactions with materials. Inside transparent materials, nonlinear optical effects can confine strong absorption only to the focal volume, extend dissipation over long filament tracks, or reach below diffraction-limited spot sizes. Hence, SLM beam shaping has been widely adopted for laser material processing applications that include parallel structuring, filamentation, fiber Bragg grating formation and optical aberration correction.

This paper reports on a range of SLM applications we have studied in femtosecond processing of transparent glasses and thin films. Laser phase-fronts were tailored by the SLM to compensate for spherical surface aberration, and to further address the nonlinear interactions that interplay between Kerr-lens self-focusing and plasma defocusing effects over shallow and deep focusing inside the glass. Limits of strong and weak focusing were examined around the respective formation of low-loss optical waveguides and long uniform filament tracks. Further, we have employed the SLM for beam patterning inside thin film, exploring the limits of phase noise, resolution and fringe contrast during interferometric intra-film structuring.

Femtosecond laser pulses of 200 fs pulse duration and 515 nm wavelength were shaped by a phase-only LCOS-SLM (Hamamatsu X10468-04). By imposing radial phase profiles, axicon, grating and beam splitting gratings, volume shape control of filament diameter, length, and uniformity as well as simultaneous formation of multiple filaments has been demonstrated. Similarly, competing effects of spherical surface aberration, self-focusing, and plasma de-focusing were studied and delineated to enable formation of low-loss optical waveguides over shallow and deep focusing conditions.

Lastly, SLM beam shaping has been successfully extended to interferometric processing inside thin transparent film, enabling the arbitrary formation of uniform or non-uniform, symmetric or asymmetric patterns of flexible shape on nano-scale dimensions without phase-noise degradation by the SLM patterning. We present quantized structuring of thin films by a single laser pulse, demonstrating λ/2nfilm layer ejection control, blister formation, nano-cavities, and film colouring. Closed intra-film nanochannels with high aspect ratio (20:1) have been formed inside 3.5 um thick silica, opening new prospects for sub-cellular studies and lab-in-film concepts that integrate on CMOS silicon technologies.

Proceedings Article | 12 April 2005 Paper

F₂-laser writing of silica optical waveguides in silicone rubber

Masayuki Okoshi, Jianzhao Li, Peter Herman

Proceedings Volume 5713, (2005) https://doi.org/10.1117/12.589392

KEYWORDS: Waveguides, Silica, Silicon, Pulsed laser operation, Semiconductor lasers, Infrared radiation, Photomasks, Light scattering, Charge-coupled devices, Optical circuits

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Proceedings Article | 9 December 2004 Paper

Micro-lens machining on optical fibers by direct laser ablation

Thomas Fricke-Begemann, Jianzhao Li, Jurgen Ihlemann, Peter Herman, Gerd Marowsky

Proceedings Volume 5578, (2004) https://doi.org/10.1117/12.567671

KEYWORDS: Optical fibers, Laser ablation, Lenses, Silica, Fiber lasers, Microscopes, Beam shaping, Laser cutting, Scanning electron microscopy, Axicons

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Proceedings Article | 8 December 2004 Paper

F2-laser microfabrication for integrating optical circuits with microfluidic biochips

Stephen Ho, J. Aitchison, Shane Eaton, Peter Herman, Jianzhao Li

Proceedings Volume 5591, (2004) https://doi.org/10.1117/12.571338

KEYWORDS: Waveguides, Microfluidics, Glasses, Silica, Lab on a chip, Refractive index, Sensors, Optical spheres, Laser ablation, Wave propagation

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Proceedings Article | 15 July 2004 Paper

F2-laser microfabrication of efficient diffractive optical phase elements

Mi Li Ng, Peter Herman, Amir Nejadmalayeri, Jianzhao Li

Proceedings Volume 5339, (2004) https://doi.org/10.1117/12.537981

KEYWORDS: Diffractive optical elements, Etching, Silica, Surface roughness, Laser ablation, Light scattering, Optical components, Glasses, Diffraction, Laser systems engineering

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Proceedings Article | 18 November 2003 Paper

Fabrication of diffractive phase elements by F2-laser ablation of fused silica

Malte Schulz-Ruthenberg, Juergen Ihlemann, Gerd Marowsky, Amir Nejadmalayeri, Mi Ng, Jianzhao Li, Peter Herman

Proceedings Volume 5063, (2003) https://doi.org/10.1117/12.541070

KEYWORDS: Silica, Laser ablation, Laser processing, Optical components, Objectives, Fourier transforms, Photomasks, Liquids, Binary data, Beam shaping

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Proceedings Article | 17 October 2003 Paper

F2-laser micropatterning of chrome-coated CaF2 for vacuum-ultraviolet masks

Andrew Yick, Jianzhao Li, Peter Herman

Proceedings Volume 4977, (2003) https://doi.org/10.1117/12.479538

KEYWORDS: Laser ablation, Photomasks, Fluorine, Silica, Etching, Glasses, Vacuum ultraviolet, Microscopes, Surface roughness, Pulsed laser operation

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Proceedings Article | 15 April 2003 Paper

F2-laser microfabrication of sub-um gratings in fused silica

Juergen Ihlemann, Sabine Mueller, Stefan Puschmann, Dirk Schaefer, Peter Herman, Jianzhao Li, Midori Wei

Proceedings Volume 4941, (2003) https://doi.org/10.1117/12.468237

KEYWORDS: Silica, Laser ablation, Diffraction gratings, Scanning electron microscopy, Atomic force microscopy, Diffraction, Chromium, Microfabrication, Ultraviolet radiation, Helium neon lasers

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Proceedings Article | 17 January 2003 Paper

Single-cell analysis on a microchip platform using optical tweezers and optical scissors

Nigel Munce, Jianzhao Li, Peter Herman, Lothar Lilge

Proceedings Volume 4982, (2003) https://doi.org/10.1117/12.472892

KEYWORDS: Optical tweezers, Microscopes, Polymethylmethacrylate, Fluorine, Laser optics, Confocal microscopy, Luminescence, Channel projecting optics, Microfluidics, Analytical research

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Proceedings Article | 18 June 2002 Paper

F2-laser photosensitivity applications in germanosilicate fiber and planar waveguides

Kevin Chen, Peter Herman, Dragan Coric, Jianzhao Li, Xiaoli Wei, Roderick Taylor, Cyril Hnatovsky

Proceedings Volume 4640, (2002) https://doi.org/10.1117/12.433297

KEYWORDS: Hydrogen, Refractive index, Waveguides, Birefringence, Fiber lasers, Fiber Bragg gratings, Planar waveguides, Absorption, Etching, Fused deposition modeling

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Proceedings Article | 18 June 2002 Paper

High-resolution F2-laser machining of micro-optic components

Jianzhao Li, Peter Herman, Xiaoli Wei, Kevin Chen, Juergen Ihlemann, Gerd Marowsky, Peter Oesterlin, Berthold Burghardt

Proceedings Volume 4637, (2002) https://doi.org/10.1117/12.470627

KEYWORDS: Glasses, Micromachining, Silica, Micro optics, Laser ablation, Laser processing, Microfabrication, Pulsed laser operation, Atomic force microscopy, Biomedical optics

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Proceedings Article | 18 June 2002 Paper

F2-laser microfabrication of buried waveguide structures in transparent glasses

Xiaoli Wei, Kevin Chen, Dragan Coric, Peter Herman, Jianzhao Li

Proceedings Volume 4637, (2002) https://doi.org/10.1117/12.470629

KEYWORDS: Waveguides, Refractive index, Glasses, Silica, Near field optics, Ultraviolet radiation, Ultrafast lasers, Photonics, Microfabrication, Optical signal processing

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Proceedings Article | 28 May 2002 Paper

Optical micromanipulation and analysis of single cells on a microchip platform

Nigel Munce, Jianzhao Li, Peter Herman, Lothar Lilge

Proceedings Volume 4622, (2002) https://doi.org/10.1117/12.468340

KEYWORDS: Optical tweezers, Fluorine, Etching, Microscopes, Mirrors, Optical micromanipulation, Molecular lasers, Glasses, Biological research, Pulsed laser operation

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Proceedings Article | 13 August 1993 Paper

Persistent spectral hole-burning study on some organic and inorganic materials

Lingbing Chen, Youyuan Zhao, Jianzhao Li, Fuming Li

Proceedings Volume 2053, (1993) https://doi.org/10.1117/12.150653

KEYWORDS: Hole burning spectroscopy, Combustion, Molecules, Ions, Optical storage, Quantum efficiency, Dye lasers, Data storage, Data analysis, Absorption

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Showing 5 of 21 publications

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