Browsing by Author "Shivam Kumar Chaubey"

Now showing 1 - 6 of 6

Digital Fourier Transform Holography Using a Beam Displacer †
(Multidisciplinary Digital Publishing Institute (MDPI), 2023) Mohit Rathor; Shivam Kumar Chaubey; Rakesh Kumar Singh
Fourier transform holography overcomes the phase recovery challenge through recording complex field information of the object in an interference pattern recorded at the far field, i.e., Fourier plane. Moreover, this geometry helps to reconstruct the complex field of the object from a single Fourier transform, which is an attractive feature for the numerical reconstruction of the digitally recorded hologram. In this paper, we present a nearly common path experimental design for recording a digital Fourier holographic hologram using a beam displacer, and recover the complex valued objects using the Fourier analysis. The performance of the system is experimentally examined for different objects. © 2023 by the authors.
Dust storm characteristics over Indo-Gangetic basin through satellite remote sensing
(Elsevier, 2022) Prashant Kumar Chauhan; Akhilesh Kumar; Vineet Pratap; Shivam Kumar Chaubey; Abhay Kumar Singh
The dust storm is a common atmospheric phenomenon that modifies the optical, physical, and radiative properties of aerosols and plays a crucial role in the global radiation budget, and hence global climate change. The present chapter proposes different remote sensing techniques, such as moderate resolution imaging spectroradiometer true-color images, AErosol RObotic NETwork, cloud-aerosol LIDAR, and infrared pathfinder satellite observation (CALIPSO) to study the various properties of dust particles during dust storms over Indo-Gangetic Basin. In addition, Hybrid Single-Particle Lagrangian Integrated Trajectory model is used for the event confirmation and source identification of dust storms. © 2023 Elsevier Ltd. All rights reserved.
Enhanced live cell imaging through polarization digital holographic microscope
(Optical Society of America, 2024) Shivam Kumar Chaubey; Mohit Rathor; Rupen Tamang; Biplob Koch; Rakesh Kumar Singh
[No abstract available]
Polarization digital holographic microscope for live cell imaging
(SPIE, 2024) Rakesh Kumar Singh; Shivam Kumar Chaubey; Mohit Rathor; Rupen Tamang; Biplob Koch
Polarization, a fundamental feature of the light, is a useful parameter in understanding the complex optical responses of the system and to unravel unique properties that are otherwise missing. Usually, measurement of the polarization demands multiple measurements, which is not appropriate for live imaging. In this paper, we discuss and present some of our recent works on development of polarization digital holographic microscope for spatially resolved and a label-free imaging. Our emphasis is on single-shot polarization imaging and its possible applications in live cancer cell imaging. © 2024 SPIE.
Quantitative phase imaging of cancerous cell by inverted polarization digital holographic microscope
(Optical Society of America, 2024) Mohit Rathor; Shivam Kumar Chaubey; Rupen Tamang; Biplob Koch; Rakesh Kumar Singh
We present a digital holographic microscope in the inverted geometry to extract the real-time quantitative polarization information of cancerous cells. Our technique is non-invasive and uses a single-shot intensity measurement for complete wavefront measurement. © Optica Publishing Group 2024, © 2024 The Author(s)
Single-Shot Quantitative Polarization Imaging of Live Cancer Cells
(American Chemical Society, 2023) Mohit Rathor; Shivam Kumar Chaubey; Rupen Tamang; Biplob Koch; Rakesh Kumar Singh
Polarization, a fundamental feature of the light-matter interaction, is useful in understanding the complex optical responses of the system and to unravel unique properties that are otherwise missing. Usually, measurement of the polarization demands multiple measurements, which is not suitable for live imaging. In this paper, we present a label-free and a single-shot noninvasive quantitative anisotropy imaging of the cancer cells using a polarization digital holographic microscope (PDHM). The capability of this microscope to tune the carrier frequency in recording and reconstructing polarization features from a single measurement offers a unique advantage for spatially resolved live imaging. The performance of the PDHM is first validated by measuring the anisotropy of standard samples such as polarizer and quarter wave plate (QWP) at different orientations and then applied to quantitatively image polarization changes in the cellular structure of the glioblastoma cells (U-87 MG). © 2023 American Chemical Society