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RISS 인기검색어
- 검색키워드
- 저자 : Dalip Singh Mehta (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Scientific and Engineering Applications of Full-field Swept-sourceOptical Coherence Tomography
Dalip Singh Mehta,Tulsi Anna,Chandra Shakher 한국광학회 2009 Current Optics and Photonics Vol.13 No.3
We report the development of full-field swept-source optical coherence tomography (SS-OCT) in the wavelength range of 815-870 nm using a unique combination of super-luminescent diode (SLD) as broad-band light source and acousto-optic tunable filter (AOTF) as a frequency-scanning device. Some new applications of full-field SS-OCT in forensic sciences and engineering materials have been demonstrated. Results of simultaneous topography and tomography of latent fingerprints, silicon microelectronic circuits and composite materials are presented. The main advantages of the present system are completely non-mechanical scanning, wide-field, compact and low-cost.
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Gyanendra Singh,Dalip Singh Mehta 한국정보디스플레이학회 2014 Journal of information display Vol.15 No.2
White-light generation by cerium-doped yttrium aluminum garnet inorganic phosphor, which was used to coat a diffusingpolyethylene terephthalate (PET) substrate excited by a blue light-emitting diode (LED) is reported. The diffused PETsubstrate was used to scatter the directional light of the blue LED at a large angle while the phosphor layer was used toconvert the blue light to white light through the downconversion mechanism. The diffuser is color-tunable, which can beachieved by varying the phosphor concentration and the thickness of the coating material. The Commission Internationalde l’Eclairage (CIE) coordinates and the correlated color temperature for the white-light emission were calculated, and theresults are reported herein. It was found that the white-light source had the CIE coordinates (0.33, 0.34) and had a broadspectrum profile.
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Role of Arbitrary Intensity Profile Laser Beam in Trapping of RBC for Phase-imaging
Ranjeet Kumar,Vishal Srivastava,Dalip Singh Mehta,Chandra Shakher 한국광학회 2016 Current Optics and Photonics Vol.20 No.1
Red blood cells (RBCs) are customarily adhered to a bio-functionalised substrate to make them stationaryin interferometric phase-imaging modalities. This can make them susceptible to receive alterations in innatemorphology due to their own weight. Optical tweezers (OTs) often driven by Gaussian profile of a laserbeam is an alternative modality to overcome contact-induced perturbation but at the same time a steeplyfocused laser beam might cause photo-damage. In order to address both the photo-damage and substrateadherence induced perturbations, we were motivated to stabilize the RBC in OTs by utilizing a laser beamof ‘arbitrary intensity profile’ generated by a source having cavity imperfections per se. Thus the immobilizedRBC was investigated for phase-imaging with sinusoidal interferograms generated by a compact and robustMichelson interferometer which was designed from a cubic beam splitter having one surface coated withreflective material and another adjacent coplanar surface aligned against a mirror. Reflected interferogramsfrom bilayers membrane of a trapped RBC were recorded and analyzed. Our phase-imaging set-up is limitedto work in reflection configuration only because of the availability of an upright microscope. Due to RBC’smembrane being poorly reflective for visible wavelengths, quantitative information in the signal is weakand therefore, the quality of experimental results is limited in comparison to results obtained in transmissionmode by various holographic techniques reported elsewhere.
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Vishal Srivastava,Mohammad Inam,Ranjeet Kumar,Dalip Singh Mehta 한국광학회 2016 Current Optics and Photonics Vol.20 No.6
We present a single shot low coherence white light Hilbert phase microscopy (WL-HPM) for quantitativephase imaging of Si opto-electronic devices, i.e., Si integrated circuits (Si-ICs) and Si solar cells. Whitelight interferograms were recorded by a color CCD camera and the interferogram is decomposed into thethree colors red, green and blue. Spatial carrier frequency of the WL interferogram was increasedsufficiently by means of introducing a tilt in the interferometer. Hilbert transform fringe analysis was usedto reconstruct the phase map for red, green and blue colors from the single interferogram. 3D step heightmap of Si-ICs and Si solar cells was reconstructed at multiple wavelengths from a single interferogram. Experimental results were compared with Atomic Force Microscopy and they were found to be close toeach other. The present technique is non-contact, full-field and fast for the determination of surfaceroughness variation and morphological features of the objects at multiple wavelengths.
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