These are concept designs that I’ve created for the sole purpose of demonstrating my capabilities. This page is new and under construction.
Pancake Lens for VR
This polarization-based “pancake lens” design was inspired by a 2018 Oculus VR patent. Light from a display is converted from p to circular polarization by a quarter waveplate oriented 45 deg relative to the polarization axis. The light is then transmitted through a partially reflective, curved mirror. A second quarter waveplate converts it from circular to s polarization, which is reflected by a curved polarizer. The light then passes through the waveplate two more times, rotating the polarization to p, which is then transmitted to the eye. The folded design allows for a longer focal length in a smaller package.
Plastic Lens with Diffractive Optic for AR
This F/6 3P1G lens with 2 even aspheres, 2 odd aspheres, and a DO applied to a fused silica substrate is nearly diffraction-limited over a 50-deg FOV in the visible.
Semi-transparent Mangin Mirror Lens
This F/7 compact lens with external pupil is diffraction-limited over a 20-deg FOV in the visible. It has two “Mangin” type lenses with an air space in between. Straylight could potentially be reduced with polarizers, as in the pancake lens.
Off-axis Reflective Imager
This F/5 off-axis reflective imager is nearly diffraction-limited over a 10-deg FOV. All three mirrors are conic sections and one is biconic.
Acrylic Freeform Version of Off-axis Reflective Imager
Same design as above, reoptimized as a solid acrylic optic. It’s still nearly diffraction-limited for a single wavelength, but as expected, this version has chromatic aberrations.
Navarro Eye Accommodation with Focus Distance (video)
I created this model using formulas from Navarro’s 1985 paper, “Accommodation-dependent model of the human eye with aspherics”. Note that the retinal image remains in focus as the object distance is reduced, until the object is quite close. The crystalline lens radii, conic constant, thickness, and index adjust accordingly, as well as the aqueous chamber thickness and the vitreous humor conic constant.
I designed this LED collimator for an Osram SoleriQ P9 LED array. It’s solid plastic with a cylindrical recess where the LED is inserted. The rays are either focused by a small lens at the end of the recess or totally internally reflected by the outer boundary.
Lenslet Array Beam Combiner
I designed this hexagonal lenslet array and lens to combine an array of sources.