Peter R. Herman
- Courses2
- Reviews7
- School: University of Toronto
- Campus: St. George Campus
- Department: Electrical Engineering
- Email address: Join to see
- Phone: Join to see
-
Location:
Toronto, ON - Dates at University of Toronto: March 2013 - April 2018
- Office Hours: Join to see
N/A
Would take again: Yes
For Credit: Yes
0
1
Mandatory
Awesome
Do not base your judgment on the negative comments. Personally, he's the best prof in the department. He gives amazing chalkboard lectures and he makes the course content really interesting. Exams test you on lecture material. Style is similar to quizzes and homework. He stays even after class to answer questions which I find really helpful.
Biography
University of Toronto St. George Campus - Electrical Engineering
Peter R. Herman received the B.Eng. degree (1980) in Engineering
Physics at McMaster University. He earned MASc (1982) and PhD (1986)
degrees studying lasers and diatomic spectroscopy in the Physics
Department at the University of Toronto that followed with a
post-doctoral position at the Institute of Laser Engineering in Osaka
University, Japan (1987) to the study of laser-plasma physics and x-ray
lasers. He joined the Department of Electrical and Computer Engineering
at the University of Toronto in 1988 where he currently holds a full
professor position. Professor Herman directs a large and collaborative
research group that develops and applies laser technology and advanced
beam delivery systems to control and harvest laser interactions in new
frontiers of 3-D nanofabrication. Our mantra is: “We begin with light
and we end with light devices.” To this end we are inventing new methods
for processing internally inside optical materials that carve out
highly compact and functional lightwave circuits, microfluidics,
optofluidic systems, biophotonic sensors, and smart medical catheters.
Our end goals are inventing new manufacturing processes and extending
optical device and Lab-on-a-chip concepts towards more compact
Lab-on-a-fiber and Lab-in-a-film microsystems.
Memberships/Awards
- Fellow, Optical Society of America, 2000
- International Society for Optics and Photonics (SPIE), conference co-chair & committees
- IEEE, Photonics Society, member
- Infrastructure Award, Canada Foundation for Innovation (CFI) and Ontario Innovation Trust (OIT), 1999, 2000, 2005, 2009
- Japan Society for the Promotion of Science, 1987
- NSERC Post-Doctoral Fellowship, 1987
- NSERC 1967 Science and Engineering Scholarship, 1980-1985
Experience
University of Toronto
Professor
Full Professor Position - Teaching and Research
Osaka University
Postdoctoral Fellow
Research: X-Ray Lasers
Education
McMaster University
BaEng
Engineering Physics
University of Toronto
PhD
Laser Physics
University of Toronto
MSc
Physics
University of Toronto
Professor
Full Professor Position - Teaching and Research
Publications
Heat accumulation effects in femtosecond laser-written waveguides with variable repetition rate
Optics Expres
High-repetition rate femtosecond lasers are shown to drive heat accumulation processes that are attractive for rapid writing of low-loss optical waveguides in transparent glasses. A novel femtosecond fiber laser system (IMRA America, FCPA μJewel) providing variable repetition rate between 0.1 and 5 MHz was used to study the relationship between heat accumulation and resulting waveguide properties in fused silica and various borosilicate glasses. Increasing repetition rate was seen to increase the waveguide diameter and decrease the waveguide loss, with waveguides written with 1-MHz repetition rate yielding ~0.2-dB/cm propagation loss in Schott AF45 glass. A finite-difference thermal diffusion model accurately tracks the waveguide diameter as cumulative heating expands the modification zone above 200-kHz repetition rate.
Heat accumulation effects in femtosecond laser-written waveguides with variable repetition rate
Optics Expres
High-repetition rate femtosecond lasers are shown to drive heat accumulation processes that are attractive for rapid writing of low-loss optical waveguides in transparent glasses. A novel femtosecond fiber laser system (IMRA America, FCPA μJewel) providing variable repetition rate between 0.1 and 5 MHz was used to study the relationship between heat accumulation and resulting waveguide properties in fused silica and various borosilicate glasses. Increasing repetition rate was seen to increase the waveguide diameter and decrease the waveguide loss, with waveguides written with 1-MHz repetition rate yielding ~0.2-dB/cm propagation loss in Schott AF45 glass. A finite-difference thermal diffusion model accurately tracks the waveguide diameter as cumulative heating expands the modification zone above 200-kHz repetition rate.
Temperature-compensated fiber-optic 3D shape sensor based on femtosecond laser direct-written Bragg grating waveguides
Optics Express
Heat accumulation effects in femtosecond laser-written waveguides with variable repetition rate
Optics Expres
High-repetition rate femtosecond lasers are shown to drive heat accumulation processes that are attractive for rapid writing of low-loss optical waveguides in transparent glasses. A novel femtosecond fiber laser system (IMRA America, FCPA μJewel) providing variable repetition rate between 0.1 and 5 MHz was used to study the relationship between heat accumulation and resulting waveguide properties in fused silica and various borosilicate glasses. Increasing repetition rate was seen to increase the waveguide diameter and decrease the waveguide loss, with waveguides written with 1-MHz repetition rate yielding ~0.2-dB/cm propagation loss in Schott AF45 glass. A finite-difference thermal diffusion model accurately tracks the waveguide diameter as cumulative heating expands the modification zone above 200-kHz repetition rate.
Temperature-compensated fiber-optic 3D shape sensor based on femtosecond laser direct-written Bragg grating waveguides
Optics Express
Waveguide writing in fused silica with a femtosecond fiber laser at 522 nm and 1 MHz repetition rate
Optics Express
We report on waveguide writing in fused silica with a novel commercial femtosecond fiber laser system (IMRA America, FCPA µJewel). The influence of a range of laser parameters were investigated in these initial experiments, including repetition rate, focal area, pulse energy, scan speed, and wavelength. Notably, it was not possible to produce low-loss waveguides when writing with the fundamental wavelength of 1045 nm. However, it was possible to fabricate telecom-compatible waveguides at the second harmonic wavelength of 522 nm. High quality waveguides with propagation losses below 1 dB/cm at 1550 nm were produced with 115 nJ/pulse at 1 MHz and 522 nm.
Heat accumulation effects in femtosecond laser-written waveguides with variable repetition rate
Optics Expres
High-repetition rate femtosecond lasers are shown to drive heat accumulation processes that are attractive for rapid writing of low-loss optical waveguides in transparent glasses. A novel femtosecond fiber laser system (IMRA America, FCPA μJewel) providing variable repetition rate between 0.1 and 5 MHz was used to study the relationship between heat accumulation and resulting waveguide properties in fused silica and various borosilicate glasses. Increasing repetition rate was seen to increase the waveguide diameter and decrease the waveguide loss, with waveguides written with 1-MHz repetition rate yielding ~0.2-dB/cm propagation loss in Schott AF45 glass. A finite-difference thermal diffusion model accurately tracks the waveguide diameter as cumulative heating expands the modification zone above 200-kHz repetition rate.
Temperature-compensated fiber-optic 3D shape sensor based on femtosecond laser direct-written Bragg grating waveguides
Optics Express
Waveguide writing in fused silica with a femtosecond fiber laser at 522 nm and 1 MHz repetition rate
Optics Express
We report on waveguide writing in fused silica with a novel commercial femtosecond fiber laser system (IMRA America, FCPA µJewel). The influence of a range of laser parameters were investigated in these initial experiments, including repetition rate, focal area, pulse energy, scan speed, and wavelength. Notably, it was not possible to produce low-loss waveguides when writing with the fundamental wavelength of 1045 nm. However, it was possible to fabricate telecom-compatible waveguides at the second harmonic wavelength of 522 nm. High quality waveguides with propagation losses below 1 dB/cm at 1550 nm were produced with 115 nJ/pulse at 1 MHz and 522 nm.
Quantized structuring of transparent films with femtosecond laser interference
LIght: Science & Applications
The confinement of laser interactions inside transparent materials assisted by tight optical focusing and short-pulsed nonlinear interactions has driven many high-resolution patterning and probing applications in science and technology. In thin transparent films, laser interactions confined to the film/substrate interface have underpinned blistering and ejection processes for nanofluidic channel fabrication, film patterning and cell catapulting. Here, we harness femtosecond lasers to drive nonlinear interactions within Fabry–Perot interference fringes to define narrow nanolength scale zones for highly resolved internal structuring of a film of refractive index, nfilm, at fringe maxima separated by λ/2nfilm. This novel interaction internally cleaves the film to open subwavelength internal cavities and form thin membranes at single or multiple depths from which follow significant opportunities for writing multilevel nanofluidic channels inside the film, as well as ejecting nanodisks at quantized film depths for coloring and three-dimensional surface patterning that promise new compact types of lab-in-film devices.
Heat accumulation effects in femtosecond laser-written waveguides with variable repetition rate
Optics Expres
High-repetition rate femtosecond lasers are shown to drive heat accumulation processes that are attractive for rapid writing of low-loss optical waveguides in transparent glasses. A novel femtosecond fiber laser system (IMRA America, FCPA μJewel) providing variable repetition rate between 0.1 and 5 MHz was used to study the relationship between heat accumulation and resulting waveguide properties in fused silica and various borosilicate glasses. Increasing repetition rate was seen to increase the waveguide diameter and decrease the waveguide loss, with waveguides written with 1-MHz repetition rate yielding ~0.2-dB/cm propagation loss in Schott AF45 glass. A finite-difference thermal diffusion model accurately tracks the waveguide diameter as cumulative heating expands the modification zone above 200-kHz repetition rate.
Temperature-compensated fiber-optic 3D shape sensor based on femtosecond laser direct-written Bragg grating waveguides
Optics Express
Waveguide writing in fused silica with a femtosecond fiber laser at 522 nm and 1 MHz repetition rate
Optics Express
We report on waveguide writing in fused silica with a novel commercial femtosecond fiber laser system (IMRA America, FCPA µJewel). The influence of a range of laser parameters were investigated in these initial experiments, including repetition rate, focal area, pulse energy, scan speed, and wavelength. Notably, it was not possible to produce low-loss waveguides when writing with the fundamental wavelength of 1045 nm. However, it was possible to fabricate telecom-compatible waveguides at the second harmonic wavelength of 522 nm. High quality waveguides with propagation losses below 1 dB/cm at 1550 nm were produced with 115 nJ/pulse at 1 MHz and 522 nm.
Quantized structuring of transparent films with femtosecond laser interference
LIght: Science & Applications
The confinement of laser interactions inside transparent materials assisted by tight optical focusing and short-pulsed nonlinear interactions has driven many high-resolution patterning and probing applications in science and technology. In thin transparent films, laser interactions confined to the film/substrate interface have underpinned blistering and ejection processes for nanofluidic channel fabrication, film patterning and cell catapulting. Here, we harness femtosecond lasers to drive nonlinear interactions within Fabry–Perot interference fringes to define narrow nanolength scale zones for highly resolved internal structuring of a film of refractive index, nfilm, at fringe maxima separated by λ/2nfilm. This novel interaction internally cleaves the film to open subwavelength internal cavities and form thin membranes at single or multiple depths from which follow significant opportunities for writing multilevel nanofluidic channels inside the film, as well as ejecting nanodisks at quantized film depths for coloring and three-dimensional surface patterning that promise new compact types of lab-in-film devices.
Microstructuring of Polypyrrole by Maskless Direct Femtosecond Laser Ablation
Advanced materials
Heat accumulation effects in femtosecond laser-written waveguides with variable repetition rate
Optics Expres
High-repetition rate femtosecond lasers are shown to drive heat accumulation processes that are attractive for rapid writing of low-loss optical waveguides in transparent glasses. A novel femtosecond fiber laser system (IMRA America, FCPA μJewel) providing variable repetition rate between 0.1 and 5 MHz was used to study the relationship between heat accumulation and resulting waveguide properties in fused silica and various borosilicate glasses. Increasing repetition rate was seen to increase the waveguide diameter and decrease the waveguide loss, with waveguides written with 1-MHz repetition rate yielding ~0.2-dB/cm propagation loss in Schott AF45 glass. A finite-difference thermal diffusion model accurately tracks the waveguide diameter as cumulative heating expands the modification zone above 200-kHz repetition rate.
Temperature-compensated fiber-optic 3D shape sensor based on femtosecond laser direct-written Bragg grating waveguides
Optics Express
Waveguide writing in fused silica with a femtosecond fiber laser at 522 nm and 1 MHz repetition rate
Optics Express
We report on waveguide writing in fused silica with a novel commercial femtosecond fiber laser system (IMRA America, FCPA µJewel). The influence of a range of laser parameters were investigated in these initial experiments, including repetition rate, focal area, pulse energy, scan speed, and wavelength. Notably, it was not possible to produce low-loss waveguides when writing with the fundamental wavelength of 1045 nm. However, it was possible to fabricate telecom-compatible waveguides at the second harmonic wavelength of 522 nm. High quality waveguides with propagation losses below 1 dB/cm at 1550 nm were produced with 115 nJ/pulse at 1 MHz and 522 nm.
Quantized structuring of transparent films with femtosecond laser interference
LIght: Science & Applications
The confinement of laser interactions inside transparent materials assisted by tight optical focusing and short-pulsed nonlinear interactions has driven many high-resolution patterning and probing applications in science and technology. In thin transparent films, laser interactions confined to the film/substrate interface have underpinned blistering and ejection processes for nanofluidic channel fabrication, film patterning and cell catapulting. Here, we harness femtosecond lasers to drive nonlinear interactions within Fabry–Perot interference fringes to define narrow nanolength scale zones for highly resolved internal structuring of a film of refractive index, nfilm, at fringe maxima separated by λ/2nfilm. This novel interaction internally cleaves the film to open subwavelength internal cavities and form thin membranes at single or multiple depths from which follow significant opportunities for writing multilevel nanofluidic channels inside the film, as well as ejecting nanodisks at quantized film depths for coloring and three-dimensional surface patterning that promise new compact types of lab-in-film devices.
Microstructuring of Polypyrrole by Maskless Direct Femtosecond Laser Ablation
Advanced materials
Ultrafast laser direct hard-mask writing for high performance inverted-pyramidal texturing of silicon
38th IEEE Photovoltaic Specialists Conference
Heat accumulation effects in femtosecond laser-written waveguides with variable repetition rate
Optics Expres
High-repetition rate femtosecond lasers are shown to drive heat accumulation processes that are attractive for rapid writing of low-loss optical waveguides in transparent glasses. A novel femtosecond fiber laser system (IMRA America, FCPA μJewel) providing variable repetition rate between 0.1 and 5 MHz was used to study the relationship between heat accumulation and resulting waveguide properties in fused silica and various borosilicate glasses. Increasing repetition rate was seen to increase the waveguide diameter and decrease the waveguide loss, with waveguides written with 1-MHz repetition rate yielding ~0.2-dB/cm propagation loss in Schott AF45 glass. A finite-difference thermal diffusion model accurately tracks the waveguide diameter as cumulative heating expands the modification zone above 200-kHz repetition rate.
Temperature-compensated fiber-optic 3D shape sensor based on femtosecond laser direct-written Bragg grating waveguides
Optics Express
Waveguide writing in fused silica with a femtosecond fiber laser at 522 nm and 1 MHz repetition rate
Optics Express
We report on waveguide writing in fused silica with a novel commercial femtosecond fiber laser system (IMRA America, FCPA µJewel). The influence of a range of laser parameters were investigated in these initial experiments, including repetition rate, focal area, pulse energy, scan speed, and wavelength. Notably, it was not possible to produce low-loss waveguides when writing with the fundamental wavelength of 1045 nm. However, it was possible to fabricate telecom-compatible waveguides at the second harmonic wavelength of 522 nm. High quality waveguides with propagation losses below 1 dB/cm at 1550 nm were produced with 115 nJ/pulse at 1 MHz and 522 nm.
Quantized structuring of transparent films with femtosecond laser interference
LIght: Science & Applications
The confinement of laser interactions inside transparent materials assisted by tight optical focusing and short-pulsed nonlinear interactions has driven many high-resolution patterning and probing applications in science and technology. In thin transparent films, laser interactions confined to the film/substrate interface have underpinned blistering and ejection processes for nanofluidic channel fabrication, film patterning and cell catapulting. Here, we harness femtosecond lasers to drive nonlinear interactions within Fabry–Perot interference fringes to define narrow nanolength scale zones for highly resolved internal structuring of a film of refractive index, nfilm, at fringe maxima separated by λ/2nfilm. This novel interaction internally cleaves the film to open subwavelength internal cavities and form thin membranes at single or multiple depths from which follow significant opportunities for writing multilevel nanofluidic channels inside the film, as well as ejecting nanodisks at quantized film depths for coloring and three-dimensional surface patterning that promise new compact types of lab-in-film devices.
Microstructuring of Polypyrrole by Maskless Direct Femtosecond Laser Ablation
Advanced materials
Ultrafast laser direct hard-mask writing for high performance inverted-pyramidal texturing of silicon
38th IEEE Photovoltaic Specialists Conference
Femtosecond Laser Direct Hard Mask Writing for Selective Facile Micron-Scale Inverted-Pyramid Patterning of Silicon
Applied Physics Letters
Femtosecond Laser Direct Hard Mask Writing for Selective Facile Micron-Scale Inverted-Pyramid Patterning of Silicon
Applied Physics Letters
