Jannick P. Rolland
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View article: Design and experimental validation of a high-efficiency multi-zone metasurface waveguide in-coupler
Design and experimental validation of a high-efficiency multi-zone metasurface waveguide in-coupler Open
Augmented reality waveguide displays often suffer from low efficiency, inherently caused by losses from multiple interactions of incoming light with the in-coupler. These losses impose a fundamental limitation on system brightness and lead…
View article: Nonlinear optical microscopy with an obscuration-free, freeform reflective objective
Nonlinear optical microscopy with an obscuration-free, freeform reflective objective Open
Nonlinear optical (NLO) imaging platforms traditionally rely on refractive microscope objectives, which suffer from chromatic aberrations and temporal dispersion of pulsed excitation light. These issues degrade spatial imaging properties a…
View article: Design methods for imaging with freeform optics
Design methods for imaging with freeform optics Open
Freeform optics are transforming the way optical systems are designed. Unlike traditional lenses and mirrors, which are typically limited to simple, symmetrical shapes, freeform optics allow for total freedom of the surface shape. This fle…
View article: Subfoveal scotomas trigger fine-scale fixation reorganization: insights from retinal imaging and retinal-contingent stimulation
Subfoveal scotomas trigger fine-scale fixation reorganization: insights from retinal imaging and retinal-contingent stimulation Open
Fine spatial vision relies on the foveola, the 1-degree retinal region with highest cone density. Despite its importance, the relationship between retinal anatomy, fixational behavior, and visual perception in the foveola is not fully unde…
View article: Design-for-manufacture and assembly of an all-reflective freeform microscope objective
Design-for-manufacture and assembly of an all-reflective freeform microscope objective Open
All-reflective microscope objectives offer significant benefits for microscopy techniques that operate across widely separated spectral bands. However, designing a high-numerical aperture, unobscured, all-reflective microscope objective su…
View article: Mechanisms of foveal crowding: insights from retinal imaging and retinal-contingent psychophysics
Mechanisms of foveal crowding: insights from retinal imaging and retinal-contingent psychophysics Open
View article: The ExoLife Finder (ELF) telescope project — a cutting-edge hybrid interferometer telescope explicitly designed for the high-contrast direct detection of exoplanets.
The ExoLife Finder (ELF) telescope project — a cutting-edge hybrid interferometer telescope explicitly designed for the high-contrast direct detection of exoplanets. Open
The ExoLife Finder (ELF) is a groundbreaking ground-based facility that will transform exoplanet research through direct imaging and characterisation of terrestrial exoplanets. Our mission is to identify biomarkers within their atmospheres…
View article: Beam interaction and targeted optimization methods for AR waveguide design
Beam interaction and targeted optimization methods for AR waveguide design Open
Waveguide combiners for augmented reality are a popular architecture because they can remain compact while delivering a large etendue to the user. Waveguides propagate light via total internal reflection, passing light from the display eng…
View article: Multi-Frequency Reverberant Shear Waves for Assessing Tissue Dispersion in Optical Coherence Elastography.
Multi-Frequency Reverberant Shear Waves for Assessing Tissue Dispersion in Optical Coherence Elastography. Open
Optical coherence elastography (OCE) is a powerful non-invasive imaging technique for high-resolution assessment of tissue elasticity and viscoelasticity. Accurate characterization of viscoelastic properties requires estimating shear wave …
View article: Towards automated manufacturing process chains for freeform optics with effective reference structures
Towards automated manufacturing process chains for freeform optics with effective reference structures Open
View article: Non-Uniform Cortical Pooling Across the Foveola
Non-Uniform Cortical Pooling Across the Foveola Open
View article: Creating ground-based telescopes for imaging interferometry: SELF and ELF
Creating ground-based telescopes for imaging interferometry: SELF and ELF Open
View article: Optical image quality testing and correction of a 250-mm freeform telescope
Optical image quality testing and correction of a 250-mm freeform telescope Open
Designing with freeform optics makes it possible to correct imaging systems to high-performance levels in a compact format. To justify the extra challenges inherent in the design, fabrication, metrology, and assembly of systems utilizing f…
View article: All-reflective freeform microscope objective for ultra-broadband microscopy
All-reflective freeform microscope objective for ultra-broadband microscopy Open
Conventional refractive microscope objective lenses have limited applicability to a range of imaging modalities due to the dispersive nature of their optical elements. Designing a conventional refractive microscope objective that provides …
View article: Alignment of a Ritchey-Chrétien telescope with primary mirror figure error guided by the rapid measurement of binodal astigmatism
Alignment of a Ritchey-Chrétien telescope with primary mirror figure error guided by the rapid measurement of binodal astigmatism Open
Nodal aberration theory (NAT) is a vectorized aberration theory that was developed to describe systems without rotational symmetry. NAT predicts non-rotationally symmetric aberration field dependences for third-order astigmatism and in par…
View article: Investigating the relationship between human foveal anatomy and fixation behavior across different visual tasks
Investigating the relationship between human foveal anatomy and fixation behavior across different visual tasks Open
View article: The relationship between the decline in cone density and acuity assessed in normal viewing conditions across the central fovea
The relationship between the decline in cone density and acuity assessed in normal viewing conditions across the central fovea Open
View article: Exploring the relationship between cone density and visual crowding in the central fovea
Exploring the relationship between cone density and visual crowding in the central fovea Open
View article: High refresh rate display for natural monocular viewing in AOSLO psychophysics experiments
High refresh rate display for natural monocular viewing in AOSLO psychophysics experiments Open
By combining an external display operating at 360 frames per second with an adaptive optics scanning laser ophthalmoscope (AOSLO) for human foveal imaging, we demonstrate color stimulus delivery at high spatial and temporal resolution in A…
View article: Geometry Selection in Three-Mirror Freeform Imagers with an Accessible Exit Pupil
Geometry Selection in Three-Mirror Freeform Imagers with an Accessible Exit Pupil Open
Reimaging telescopes have an accessible exit pupil that facilitates stray light mitigation and matching to auxiliary optical systems. Freeform surfaces present the opportunity for unobscured reflective systems to be folded into geometries …
View article: Difference Autocorrelation: A Novel Approach to Estimate Shear Wave Speed in the Presence of Compression Waves
Difference Autocorrelation: A Novel Approach to Estimate Shear Wave Speed in the Presence of Compression Waves Open
In share wave elastography (SWE), the aim is to measure the velocity of shear waves, however unwanted compression waves and bulk tissue motion pose challenges in evaluating tissue stiffness. Conventional approaches often struggle to discri…
View article: High refresh rate display for natural monocular viewing in AOSLO psychophysics experiments
High refresh rate display for natural monocular viewing in AOSLO psychophysics experiments Open
By combining an external display operating at 360 frames per second with an Adaptive Optics Scanning Laser Ophthalmoscope (AOSLO) for human foveal imaging, we demonstrate color stimulus delivery at high spatial and temporal resolution in A…
View article: Mouse brain elastography changes with sleep/wake cycles, aging, and Alzheimer's disease
Mouse brain elastography changes with sleep/wake cycles, aging, and Alzheimer's disease Open
Understanding the physiological processes in aging and how neurodegenerative disorders affect cognitive function is a high priority for advancing human health. One specific area of recently enabled research is the in vivo biomechanical sta…
View article: Estimating the irradiance of a perturbed surface under an extended source
Estimating the irradiance of a perturbed surface under an extended source Open
This paper presents a method for evaluating the irradiance of a single freeform surface deviation under extended source illumination. The method takes advantage of a well-known concept, the pinhole image. First, the irradiance of the pertu…
View article: Angular Integral Autocorrelation for Speed Estimation in Shear-Wave Elastography
Angular Integral Autocorrelation for Speed Estimation in Shear-Wave Elastography Open
The utilization of a reverberant shear-wave field in shear-wave elastography has emerged as a promising technique for achieving robust shear-wave speed (SWS) estimation. However, many types of estimators cannot accurately measure SWS withi…
View article: Fast Zernike fitting of freeform surfaces using the Gauss-Legendre quadrature
Fast Zernike fitting of freeform surfaces using the Gauss-Legendre quadrature Open
Zernike polynomial orthogonality, an established mathematical principle, is leveraged with the Gauss-Legendre quadrature rule in a rapid novel approach to fitting data over a circular domain. This approach provides significantly faster fit…
View article: All-dielectric hybrid VIS-NIR dual-function metaoptic
All-dielectric hybrid VIS-NIR dual-function metaoptic Open
Metasurfaces are a promising technology that can serve as a compact alternative to conventional optics while providing multiple functions depending on the properties of the incident light, such as the wavelength, polarization, and incident…
View article: Framework for optimizing AR waveguide in-coupler architectures
Framework for optimizing AR waveguide in-coupler architectures Open
Waveguide displays have been shown to exhibit multiple interactions of light at the in-coupler diffractive surface, leading to light loss. Any losses at the in-coupler set a fundamental upper limit on the full-system efficiency. Furthermor…
View article: Angular Integral Autocorrelation for Speed Estimation in Shear Wave Elastography
Angular Integral Autocorrelation for Speed Estimation in Shear Wave Elastography Open
The utilization of a reverberant shear wave field in shear wave elastography has emerged as a promising technique for achieving robust shear wave speed (SWS) estimation. However, accurately measuring SWS within such a complex wave field re…
View article: Multiconfiguration afocal freeform telescopes
Multiconfiguration afocal freeform telescopes Open
An approach to designing multiconfiguration afocal telescopes is developed and demonstrated. Freeform surfaces are used to maximize the achievable diffraction-limited zoom ratio while staying in a compact volume for a two-position multicon…