Dr. Vani K. Chhaniwal Profile

Dr. Vani K. Chhaniwal

Research Associate

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Author

Publications (25)

Proceedings Article | 7 December 2021 Paper

Self-referencing digital holographic microscopes for bio-physical and bio-mechanical characterization of blood cells

Chetna Patel, Viral Kapadia, Vani Chhaniwal, Bahram Javidi, Arun Anand

Proceedings Volume 11922, 119220Z (2021) https://doi.org/10.1117/12.2615737

KEYWORDS: Digital holography, Holograms, Blood, Microscopes, Holography, Video processing, Video, Shearing interferometers, Refractive index, Holographic interferometry

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Proceedings Article | 22 July 2019 Presentation

Digital holography for quantification of semiconductor structures (Conference Presentation)

Vismay Trivedi, Nimit Patel, Mugdha Joglekar, Vani Chhaniwal, Seonoh Lee, Arun Anand

Proceedings Volume 11056, 1105609 (2019) https://doi.org/10.1117/12.2525684

KEYWORDS: Digital holography, Semiconductors, Holography, Holograms, Holographic interferometry, Optical design, Phase imaging, Thin films, Glasses, Inspection

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Digital holography interferometry (DHI) and digital holographic interference microscopy (DHIM) are tools that provide whole field information of the wavefront interacting with the object. This imaging modality can be an ideal tool for quantitative phase imaging of technical objects such as semiconductor samples. The phase information numerically reconstructed from the holograms can lead to extraction of the thickness/height of the sample. Usually DHI and DHIM are used in transmission mode for determination of optical thickness of the sample under investigation. In reflection mode this imaging techniques provide height of the sample. For the semiconductor industry determination of height/thickness of object structures as well as the quantification of defects in the object structures is an important issue. The thickness and defect determination can be that of semiconductor thin films, micro/nano-pillars, LED displays, liquid crystal panels, the cover glasses used for protection of these structures etc. Digital holographic interferometric method (both reflection and transmission) can be used to design devices that can act as a fast, single shot technique for quantitative phase imaging of such samples. Such devices can provide more information about the sample compared to intensity based measurement systems. Also compact the digital holographic interferometric systems can be deployed in the manufacturing line of such devices to provide real time information. We are involved in the design and development of digital holographic devices for inspection of semi-conductor wafers, thin films, displays and glass plates covering such samples. We have implemented digital holographic devices in the lens-less mode (in the case of DHI) and also with the use of an imaging lens (in the case of DHIM) both in reflection and transmission mode. DHI provides field of view equivalent to the sensor size, while DHIM technique was implemented with different magnifications, thereby providing varying field of views of the sample. Also in the case of DHI a propagation from the hologram plane (the plane at which the digital array for recording the hologram was situated) to the best focus plane (object plane) was realized by numerical implementation of diffraction integral. In DHIM, the digital array used for recording the hologram was at the image plane of the magnifying/de-magnifying lens. So the whole numerical reconstruction process reduced to Fourier fringe analysis, making the technique less computationally exhaustive, fast and quasi real-time. The developed devices were calibrated using known objects and then tested on different samples. The obtained results are found to be encouraging. In this paper, we describe our efforts in design, development and fabrication of digital holographic devices for the inspection of semiconductor samples.

Proceedings Article | 22 July 2019 Paper

Wide field of view self-referencing quantitative phase contrast microscopy based on Lloyd’s mirror interferometer

Mugdha Joglekar, Vismay Trivedi, Swapnil Mahajan, Vani Chhnaiwal, Rainer Leitgeb, Giancarlo Pedrini, Bahram Javidi, Arun Anand

Proceedings Volume 11076, 110760S (2019) https://doi.org/10.1117/12.2526568

KEYWORDS: Holograms, Microscopy, Digital holography, Microscopes, Phase contrast, Interferometers, Holography, Blood, Diffraction

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SPIE Journal Paper | 5 January 2019

Portable device based on beam deflection for refractive index mapping and diffusion coefficient measurement

Vismay Trivedi, Mugdha Joglekar, Swapnil Mahajan, Vani Chhaniwal, Bahram Javidi, Arun Anand

OE, Vol. 58, Issue 01, 014101, (January 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.1.014101

KEYWORDS: Refractive index, Diffusion, Liquids, Image analysis, Image processing, Binary data, Laser beam diagnostics, Optical engineering, Imaging systems, Holography

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SPIE Journal Paper | 12 December 2017 Open Access

Wide field of view common-path lateral-shearing digital holographic interference microscope

Priyanka Vora, Vismay Trivedi, Swapnil Mahajan, Nimit Patel, Mugdha Joglekar, Vani Chhaniwal, Ali-Reza Moradi, Bahram Javidi, Arun Anand

JBO, Vol. 22, Issue 12, 126001, (December 2017) https://doi.org/10.1117/12.10.1117/1.JBO.22.12.126001

KEYWORDS: Digital holography, Microscopes, Holography, Holograms, Charge-coupled devices, Wavefronts, Sensors, CCD image sensors, 3D image processing, Biomedical optics

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Proceedings Article | 28 July 2017 Paper

Imaging the effect of hemoglobin on properties of RBCs using common-path digital holographic microscope

M. Joglekar, H. Shah, V. Trivedi, S. Mahajan, V. Chhaniwal, R. Leitgeb, B. Javidi, A. Anand

Proceedings Volume 10414, 104140W (2017) https://doi.org/10.1117/12.2286038

KEYWORDS: Digital holography, Holography, Microscopes, Microscopy, Stereoscopy

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Proceedings Article | 14 July 2015 Paper

Identification of malaria infected red blood samples by digital holographic quantitative phase microscope

Nimit Patel, Vani Chhaniwal, Bahram Javidi, Arun Anand

Proceedings Volume 9536, 95360E (2015) https://doi.org/10.1117/12.2183746

KEYWORDS: Blood, Digital holography, Microscopes, Holograms, Holography, Microscopy, Refractive index, Holographic interferometry, Beam splitters, Gold

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Proceedings Article | 22 June 2015 Paper

Measurement of concentration of sugar in solutions with laser speckle decorrelation

Swapnil Mahajan, Vismay Trivedi, Vani Chhaniwal, Mahendra Prajapati, Zeev Zalevsky, Bahram Javidi, Arun Anand

Proceedings Volume 9525, 95253H (2015) https://doi.org/10.1117/12.2184698

KEYWORDS: Speckle pattern, Speckle, Polarization, Diffusers, Sensors, Calibration, Active optics, Optical testing, Glucose, Semiconductor lasers

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Proceedings Article | 22 June 2015 Paper

Diffusivity measurement using compact low cost field portable device based on light deflection

Vani Chhaniwal, Swapnil Mahajan, Vismay Trivedi, Arun Anand

Proceedings Volume 9525, 95253W (2015) https://doi.org/10.1117/12.2184789

KEYWORDS: Diffusion, Liquids, Refractive index, Binary data, Interferometry, Imaging devices, Image processing, Physics, Light emitting diodes, Pollution control

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SPIE Journal Paper | 14 July 2014

Imaging of mass transfer process using artificial fringe deflection

Vani Chhaniwal, Chittur Subramanian Narayanamurthy, Arun Anand

OE, Vol. 53, Issue 07, 074106, (July 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.7.074106

KEYWORDS: Diffusion, Refractive index, Fringe analysis, Interferometry, Liquids, CCD cameras, Optical engineering, Binary data, Light sources, Optical components

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Proceedings Article | 5 June 2014 Paper

Self-referencing digital holographic microscope for dynamic imaging of living cells

Arun Anand, Vani Chhaniwal, Swapnil Mahajan, Vismay Trivedi, Amardeep Singh, Rainer Leitgeb, Bahram Javidi

Proceedings Volume 9117, 91170X (2014) https://doi.org/10.1117/12.2050415

KEYWORDS: Digital holography, Holograms, Microscopes, Holography, Wavefronts, Phase contrast, Objectives, Blood, Sensors, Microscopy

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Proceedings Article | 15 May 2012 Paper

3D microscopic imaging at 193nm with single beam Fresnel intensity sampling and iterative phase retrieval

Arun Anand, Ahmad Faridian, Vani Chhaniwal, Giancarlo Pedrini, Wolfgang Osten, Bahram Javidi

Proceedings Volume 8384, 83840A (2012) https://doi.org/10.1117/12.919988

KEYWORDS: Wavefronts, Diffraction, Wave propagation, 3D image processing, Stereoscopy, Phase retrieval, Deep ultraviolet, Objectives, Wavefront reconstruction, Image processing

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Proceedings Article | 2 June 2011 Paper

Single beam quantitative phase contrast 3D microscopy of cells

Vani Chhaniwal, Arun Anand, Ahmad Faridian, Giancarlo Pedrini, Wolfgang Osten, Bahram Javidi

Proceedings Volume 8092, 80920D (2011) https://doi.org/10.1117/12.894998

KEYWORDS: Wavefronts, Phase contrast, Microscopy, Wave propagation, Diffusers, Speckle, Phase retrieval, Diffraction, Image processing, Digital holography

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SPIE Journal Paper | 1 June 2011 Open Access

Quantitative cell imaging using single beam phase retrieval method

Arun Anand, Vani Chhaniwal, Bahram Javidi

JBO, Vol. 16, Issue 06, 060503, (June 2011) https://doi.org/10.1117/12.10.1117/1.3589090

KEYWORDS: Wavefronts, Phase contrast, Phase retrieval, Microscopy, Diffraction, Digital holography, Speckle, Blood, Diffusers, Skin

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Proceedings Article | 20 May 2011 Paper

Three-dimensional imaging of dynamic phenomena in micro-objects using phase contrast digital holographic interferometric microscopy

Arun Anand, Vani Chhaniwal, Bahram Javidi

Proceedings Volume 8043, 80430T (2011) https://doi.org/10.1117/12.885368

KEYWORDS: Digital holography, Holograms, Phase contrast, Microscopy, 3D image processing, Holographic interferometry, Wavefronts, Diffraction, Wave propagation, Electromagnetic radiation

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Proceedings Article | 17 June 2009 Paper

Shape measurement of diffuse and transparent objects by two wavelength contouring using phase retrieval

Arun Anand, Vani Chhaniwal, Giancarlo Pedrini, Wolfgang Osten

Proceedings Volume 7390, 73900D (2009) https://doi.org/10.1117/12.827466

KEYWORDS: Wavefronts, Speckle, Wave propagation, Phase retrieval, Digital holography, Holography, Diffraction, Refractive index, Diffusers, Reconstruction algorithms

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Proceedings Article | 17 June 2009 Paper

Parameter determination of biconvex lenses using confocal imaging

Vani Chhaniwal, Arun Anand

Proceedings Volume 7389, 738911 (2009) https://doi.org/10.1117/12.827470

KEYWORDS: Sensors, Mirrors, Confocal microscopy, Refractive index, Lenses, Interferometry, Wavefronts, Fourier transforms, Collimation, Optical inspection

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Proceedings Article | 17 June 2009 Paper

Digital holographic tomography of phase objects

Arun Anand, Vani Chhaniwal, Giancarlo Pedrini, Wolfgang Osten

Proceedings Volume 7389, 73890L (2009) https://doi.org/10.1117/12.827666

KEYWORDS: Refractive index, Holograms, Digital holography, Wavefronts, Diffraction, Holography, Tomography, Diffusers, Charge-coupled devices, Sensors

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Proceedings Article | 18 June 2007 Paper

Mass transfer studies in transparent liquid solutions by polarization imaging

Vani Chhaniwal, B. S. Chakrabarty, Arun Anand

Proceedings Volume 6616, 661643 (2007) https://doi.org/10.1117/12.726006

KEYWORDS: Diffusion, Refractive index, Polarization, Crystals, Sensors, Interferometry, Liquids, Optical components, Crystal optics, Laser crystals

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Proceedings Article | 18 June 2007 Paper

Determination of lens parameters with digital holography

Vani Chhaniwal, Arun Anand

Proceedings Volume 6616, 66164H (2007) https://doi.org/10.1117/12.726192

KEYWORDS: Wavefronts, Digital holography, Refractive index, Collimation, Holograms, Charge-coupled devices, Reflectivity, Transmittance, Digital recording, Interferometry

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SPIE Journal Paper | 1 July 2005

Beamsplitter testing with Michelson interferometer

Vani Chhaniwal, Arun Anand, C. Narayanamurthy

OE, Vol. 44, Issue 07, 079701, (July 2005) https://doi.org/10.1117/12.10.1117/1.1951775

KEYWORDS: Beam splitters, Visibility, Sensors, Reflection, Mirrors, Wavefronts, Michelson interferometers, Photodiodes, Optical engineering, Optical communications

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Proceedings Article | 13 June 2005 Paper

Automatic tracing of interference fringes using Fourier filtering, local averaging and simultaneous horizontal and vertical scans

Arun Anand, Vani Chhaniwal

Proceedings Volume 5856, (2005) https://doi.org/10.1117/12.612417

KEYWORDS: Binary data, Image filtering, Fringe analysis, Wavefronts, Linear filtering, Sensors, Spatial frequencies, Analytical research, Optical filters, Gaussian filters

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Proceedings Article | 13 June 2005 Paper

Diffusion coefficient measurement of transparent liquid solutions using digital holographic interferometry

Vani Chhaniwal, Arun Anand, C. Narayanamurthy

Proceedings Volume 5856, (2005) https://doi.org/10.1117/12.612416

KEYWORDS: Diffusion, Digital holography, Holograms, Holographic interferometry, Holography, Charge-coupled devices, Refractive index, Liquids, Beam splitters, Interferometry

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Proceedings Article | 19 November 2003 Paper

Diffusion studies in transparent liquids using optical techniques

Vani Chhaniwal, Arun Anand, C. Narayanamurthy

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.530074

KEYWORDS: Diffusion, Liquids, Interferometers, Refractive index, Industrial chemicals, Michelson interferometers, Glasses, Charge-coupled devices, Fringe analysis, Photonics

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Proceedings Article | 30 May 2003 Paper

Diffusion studies of transparent binary liquid solutions using fringe projection

Vani Chhaniwal, Arun Anand, Sanjay Girhe, N. Subrahmanyam, C. Narayanamurthy

Proceedings Volume 5144, (2003) https://doi.org/10.1117/12.500265

KEYWORDS: Diffusion, Refractive index, Fringe analysis, Liquids, Binary data, Light sources, Interferometers, Glasses, CCD cameras, Interfaces

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Showing 5 of 25 publications

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