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Two-dimensional index profile reconstruction with differential near-field images measured by end-fire coupling is presented. Single mode fiber with a step-index profile measured at 632.8 nm is demonstrated.
Depth from shading is an open problem in computer vision. During the estimation of object depth or shape, integrability constraint is enforced to regularize the solution. In this paper, we introduced a regularizing term of smoothness constraint employing the 2D maximum entropy to enforce the integrability. The test on synthetic image shows the proposed method has the better performance than the available...
Monolithically integrated high-efficiency multijunction solar cells are highly desirable for both space and terrestrial applications. This paper reports recent experimental work on newly proposed multijunction solar cell designs that utilize lattice-matched II/VI CdZnSeTe and III/V AlGaAsSb materials grown on GaSb substrates. Single ZnTe layers and thin CdZnTe/ZnTe quantum wells have been grown on...
Malignant melanoma is one of the most fatal forms of skin cancer. There are two significant signs indicating malignancy of a melanoma, that is, abnormal melanin distribution in dermis layer and a peripheral blood net. We developed a multi-spectral optical Nevoscope aimed to diagnosing malignant melanoma non-invasively. An algorithm is proposed to reconstruct the melanoma in terms of Nevoscope geometry...
We demonstrate three-dimensional terahertz (THz) holography with the use of the windowed Fourier transformation. The coherent nature of THz time domain spectroscopy allows measurement of the phase and amplitude of the THz wave for holographic imaging.
Two dimensional electro-optic sampling allows a target's scattered terahertz field to be measured. By obtaining multiple projection images we have performed the reconstruction of three dimensional targets with millimeter resolution.
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