LED-based multi-wavelength phase imaging interference microscopy

Quantitative Phase Imaging using Multi-wavelength Optical Phase Unwrapping

Linear phase imaging using differential interference contrast microscopy.

We propose an extension to Nomarski differential interference contrast microscopy that enables isotropic linear phase imaging. The method combines phase shifting, two directions of shear and Fourier-space integration using a modified spiral phase transform. We simulated the method using a phantom object with spatially varying amplitude and phase. Simulated results show good agreement between th...

Exploiting Feature-Based Fusion in LED-based Multi-Spectral Imaging

Multi-spectral recording systems are used in numerous applications ranging from quality assurance over biometrics to remote sensing. This paper reports on the feasibility of a LED-based multi-spectral imaging system where the spectral characteristics of the illumination is changed by activating different LEDs. The multi-spectral images are captured by a cost-efficient CCD camera. We focus here ...

Nanoscale quantitative phase imaging using XOR-based X-ray differential interference contrast microscopy

We propose a quantitative x-ray phase imaging technique using previously demonstrated XOR objectives. The fabrication process of XOR is identical to that of a Fresnel zone-plate and as a result the same finest outermost zone width, thus spatial resolution, can be achieved. A series of phase shifts from 0 to 2p is implemented by shifting the relative position of the grating with respect to the z...

Interference microscopy for three-dimensional imaging with wavelength-to-depth encoding.

A novel interference microscope for three-dimensional (3D) imaging based on a wavelength-to-depth encoding technique is presented. Wavelength-to-depth encoding is realized by use of a diffractive lens and wavelength tuning. A high depth resolution of 0.71 mum is obtained with 0.90-N.A. objective lenses. Experimental measurements of a four-level grating are presented, and the results are found t...