Aaron D. Slepkov
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View article: Boosted decision trees for non-resonant background removal in hyperspectral CARS microscopy
Boosted decision trees for non-resonant background removal in hyperspectral CARS microscopy Open
Coherent anti-Stokes Raman scattering (CARS) is a nonlinear optical process used for spectroscopy and label-free chemical imaging. CARS signals can be orders of magnitude stronger than those of its incoherent counterpart, spontaneous Raman…
View article: Decision-tree-based non-resonant background removal for enhancing chemical-selective contrast in hyperspectral CARS microscopy
Decision-tree-based non-resonant background removal for enhancing chemical-selective contrast in hyperspectral CARS microscopy Open
Coherent anti-Stokes Raman scattering (CARS) is a nonlinear optical process used for spectroscopy and chemical imaging. CARS signals can be orders of magnitude stronger than those of its incoherent counterpart, spontaneous Raman scattering…
View article: Decision-tree-based non-resonant background removal for enhancing chemical-selective contrast in hyperspectral CARS microscopy
Decision-tree-based non-resonant background removal for enhancing chemical-selective contrast in hyperspectral CARS microscopy Open
Coherent anti-Stokes Raman scattering (CARS) is a nonlinear optical process used for spectroscopy and chemical imaging. CARS signals can be orders of magnitude stronger than those of its incoherent counterpart, spontaneous Raman scattering…
View article: Decision-tree-based non-resonant background removal for enhancing chemical-selective contrast in hyperspectral CARS microscopy
Decision-tree-based non-resonant background removal for enhancing chemical-selective contrast in hyperspectral CARS microscopy Open
Coherent anti-Stokes Raman scattering (CARS) is a nonlinear optical process used for spectroscopy and chemical imaging. CARS signals can be orders of magnitude stronger than those of its incoherent counterpart, spontaneous Raman scattering…
View article: Navigating the Night: Effects of Artificial Light on the Behaviour of Atlantic Puffin Fledglings
Navigating the Night: Effects of Artificial Light on the Behaviour of Atlantic Puffin Fledglings Open
Every year in Newfoundland, young Atlantic Puffins ( Fratercula arctica ) departing their nests at night for the first time become stranded in towns near their breeding colonies, a phenomenon thought to be caused by attraction toward artif…
View article: Linking microwave heating of aqueous spheres to morphology-dependent resonances
Linking microwave heating of aqueous spheres to morphology-dependent resonances Open
It was recently suggested that the sparking of grape dimers in microwave ovens is due to the interaction of morphology-dependent resonances in aqueous spheres. However, evidence for microwave resonances in individual grape-sized aqueous sp…
View article: Quantitative measurement of birefringence in transparent films across the visible spectrum
Quantitative measurement of birefringence in transparent films across the visible spectrum Open
Common transparent polymer films, such as cellophane and household tape, are frequently used as examples of birefringent materials in textbooks and classroom demonstrations. Qualitatively, birefringence is often demonstrated by layering su…
View article: Integrated testlets in optics and photonics: a novel assessment tool and its online deployment
Integrated testlets in optics and photonics: a novel assessment tool and its online deployment Open
We describe opportunities for integrated testlets as assessments in optics and photonics courses. This new scaffolded multiple-choice approach adopts an answer-until-correct framework that can test complex understanding through either offl…
View article: Birefringence in transparent household films: quantitative measurement and dazzling demonstrations
Birefringence in transparent household films: quantitative measurement and dazzling demonstrations Open
I describe a simple spectroscopic method for measuring birefringence in household films such as adhesive tape and kitchen film. Using an incandescent light source provides students direct appreciation for the wavelength-dependent nature of…
View article: Quantitative measurement of birefringence in transparent films across\n the visible spectrum
Quantitative measurement of birefringence in transparent films across\n the visible spectrum Open
Common transparent polymer films such as cellophane and household tape are\nfrequently used as examples of birefringent materials in textbooks and\nclassroom demonstrations. Qualitatively, birefringence is often demonstrated by\nlayering s…
View article: A Baseline for Multiple-Choice Testing in the University Classroom
A Baseline for Multiple-Choice Testing in the University Classroom Open
There is a broad literature in multiple-choice test development, both in terms of item-writing guidelines, and psychometric functionality as a measurement tool. However, most of the published literature concerns multiple-choice testing in …
View article: Integrated Testlets in Optics and Photonics: A Novel Assessment Tool and its Online Deployment
Integrated Testlets in Optics and Photonics: A Novel Assessment Tool and its Online Deployment Open
We describe opportunities for integrated testlets as assessments in optics and photonics courses. This new scaffolded multiple-choice approach adopts an answer-until-correct framework that can test complex understanding through either offl…
View article: Birefringence in transparent household films: Quantitative measurement and dazzling demonstrations
Birefringence in transparent household films: Quantitative measurement and dazzling demonstrations Open
I describe a simple spectroscopic method for measuring birefringence in household films such as adhesive tape and kitchen film. Using an incandescent light source provides students direct appreciation for the wavelength-dependent nature of…
View article: Polarization-enabled spectral-focusing CARS microscopy
Polarization-enabled spectral-focusing CARS microscopy Open
We describe a spectral-focusing-based polarization-resolved coherent anti-Stokes Raman scattering (SFP-CARS) microscopy system developed by making simple and inexpensive modifications to an existing spectral focusing CARS setup. By using t…
View article: Linking plasma formation in grapes to microwave resonances of aqueous dimers
Linking plasma formation in grapes to microwave resonances of aqueous dimers Open
Significance In a popular parlor trick, plasma is created by irradiating grape hemispheres in a household microwave oven. This work ties the source of the plasma to microwave photonic hotspots at the junction of aqueous dielectric spherica…
View article: Comparison of two photonic crystal fibers for supercontinuum-Stokes spectral-focusing-CARS hyperspectroscopy
Comparison of two photonic crystal fibers for supercontinuum-Stokes spectral-focusing-CARS hyperspectroscopy Open
A popular and inexpensive experimental approach to broadband CARS microscopy involves the generation of a supercontinuum pulse from a microstructured fibre. Despite such fibres being used for CARS microscopy for over a decade, concerns abo…
View article: 10.1063/1.5027273.1
10.1063/1.5027273.1 Open
We implement spectral-focusing-CARS hyperspectroscopy to characterize pharmaceutical samples. The use of a dynamically-power-tuned supercontinuum seeding method combined with epi-detection of the CARS signals allows for broadband hyperspec…
View article: Application of spectral-focusing-CARS microscopy to pharmaceutical sample analysis
Application of spectral-focusing-CARS microscopy to pharmaceutical sample analysis Open
We implement spectral-focusing-CARS hyperspectroscopy to characterize pharmaceutical samples. The use of a dynamically-power-tuned supercontinuum seeding method combined with epi-detection of the CARS signals allows for broadband hyperspec…
View article: Spectrally-broad coherent anti-Stokes Raman scattering hyper-microscopy utilizing a Stokes supercontinuum pumped at 800 nm
Spectrally-broad coherent anti-Stokes Raman scattering hyper-microscopy utilizing a Stokes supercontinuum pumped at 800 nm Open
We demonstrate spectral-focusing based coherent anti-Stokes Raman scattering (SF-CARS) hyper-microscopy capable of probing vibrational frequencies from 630 cm-1 to 3250 cm-1 using a single Ti:Sapphire femtosecond laser operating at 800 nm,…