Abstract:
Provided herein are forward-imaging tunable lens systems and probes. A lens assembly is disclosed herein and comprises at least one tunable lens.
Abstract:
A polarization sensitive spectral interferometer apparatus and method for analyzing a sample by optical energy reflected from the sample. The polarization sensitive spectral interferometer apparatus and method determines polarization properties of the sample by optical energy reflected from the sample.
Abstract:
Optical methods, devices, and systems for noninvasively detecting transient surface displacements in a neuron are disclosed. Methods, devices, and systems provided may employ a phase-sensitive optical low coherence reflectometer. In addition, surface displacements due to action potential propagation in neural tissues may be detected in some embodiments using back-reflected light. According to some embodiments, exogenous chemicals or reflect ion coatings are not required. Transient neural surface displacement of less than 1 nm in amplitude and 1 ms in duration may be detected and may be generally coincident with action potential arrival to the optical measurement site. The systems and methods may be used for noninvasive detection of various neuropathies such as retinal neuropathies. They may also be useful in detecting the effects of various pharmacological agents.
Abstract:
Described herein is a polarization microscope that uses spectral-encoding of the polarization state for cellular imaging. The spectral-encoded polarization microscope is both sufficiently fast for cellular imaging and is compatible with high extinction optics required to image molecular structures and assemblies. The spectral-encoded microscope allows for the polarization state of light presented to the specimen to sample discrete states over the entirety of the Poincaré sphere while simultaneously giving a null measurement of the observed cellular birefringence. Sampling over the entire Poincaré sphere allows the microscope to determine of specimen phase retardation due to both linear and circular birefringence. The spectral-encoded polarization microscope can be operated in a slightly off-null state that will improve signal-to-noise.
Abstract:
Embodiments of the present disclosure provides systems, devices, and methods for non-invasively modifying, maintaining, or controlling local tissue optical properties. Methods and devices of the disclosure may be used for optically clearing tissue, for example, for diagnostic and/or therapeutic purposes. A method of optically clearing a tissue may comprise contacting the tissue with an optical clearing device having a base, an array of pins fixed to one side of the base, a brim fixed to the base, an inlet port in the base, an exit port in the base, and a handpiece interface tab fixed to the side of the base opposite the array of pins, applying a mechanical force to the tissue, and illuminating said tissue with at least one wavelength of light through the optical clearing device. A method may further comprise controlling the temperature of the tissue illuminated.
Abstract:
Hydrophobic paramagnetic nanoparticles can be injected with the enhanced oil recovery injection water by incorporating them inside of surfactant micelles to serve as an oil tracer. A variety of paramagnetic nanoparticles that show different susceptibility and magnetization responses to applied magnetic oscillation can be injected at different injectors, so that the origin of the oil from the different enhanced oil recovery patterns could be quantitatively identified. The concentrations of the nanoparticles in the produced crude oil and brine can be easily and instantly measured individually, employing the magnetic susceptibility meter without contacting the fluids directly.
Abstract:
Provided are methods, systems, and apparatus for altering a modulation transfer function of an imaging system. The described methods, systems and apparatus can be used to temporarily alter visual acuity of a subject.
Abstract:
The embodiments disclosed herein is related to a system for optical coherence tomographic imaging of turbid (i.e., scattering) materials utilizing multiple channels of information. The multiple channels of information may be comprised and encompass spatial, angle, spectral and polarization domains. More specifically, the embodiments disclosed herein is related to methods and apparatus for utilizing optical sources, systems or receivers capable of providing (source), processing (system) or recording (receiver) a multiplicity of channels of spectral information for optical coherence tomographic imaging of turbid materials. In these methods and apparatus the multiplicity of channels of spectral information that can be provided by the source, processed by the system, or recorded by the receiver are used to convey simultaneously spatial, spectral or polarimetric information relating to the turbid material being imaged tomographically. The multichannel optical coherence tomographic methods can be incorporated into an endoscopic probe for imaging a patient.