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High resolution, full-field tomograms are acquired in four exposures of a CCD camera using a swept laser. The imaged depth is selected by modulating the swept laser output power enabling volumetric imaging with no moving parts.
We observe impedance matched coupling between molecular vibrations and infrared optical antennas. Broadband synchrotron near-field spectroscopy reveals antenna-vibration hybridization, mode splitting, and tip excitation of coupled dark plasmon modes.
We demonstrate an effective technique which allows one to characterize a small radius micro-ring resonator via low coherence interferometric measurement beyond light source bandwidth limitation. The experimental results show significant improvements in the extracted parameters.
Interferometric imaging offers many advantages for biomedical applications such as optical sectioning/depth resolution. Inclusion of molecular contrast information improves utility but requires additional efforts to either isolate spectroscopic information or detect contrast agents.
Performance of the spectral-domain optical coherence tomography is limited by its Ascan rate, namely the frame rate of spectrometer. In this paper, 60-MHz A-scan rate is achieved by adopting a recently demonstrated parametric spectro-temporal analyzer.
A photothermal imaging microscope for single metal nanoparticles using single element interferometer has been developed. In this report, 20-nm gold nanoparticles in scattering environment was detected selectively with SNR 20.
We propose the new hologram acquisition method based on the time resolved heterodyne analysis in optical scanning holography. By applying the FFT or four phase picking algorithm, we obtain complex hologram without reference signal.
Handheld OCT scanners have been developed for screening and characterizing middle-ear infections that are highly prevalent in the pediatric population. OCT enables non-invasive identification of bacterial biofilms that will impact clinical treatment of this disease.
The practical implementation of a phase diversity sensor for high resolution measurement of disturbed laser beams is detailed here. Numerical simulations show that, with simple material, a 60×60 map of complex amplitude with λ/100 accuracy can be obtained.
An optical differentiation wavefront sensor based on measurements of wavefront slopes in two orthogonal directions obtained by far-field spatial modulation with a binary pixelated filter inducing a linear amplitude transmission is demonstrated.
The Fractional Fourier transform can be understood as a chirp-based decomposition. Accordingly it can be used to process fringe patterns with quadratic phase, including denoising, quantization error reduction, sampling and reconstruction, and phase derivative estimation.
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