Prof. Supratik Guha Profile

Prof. Supratik Guha

at Univ of Chicago

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Publications (5)

Proceedings Article | 13 March 2024 Presentation

Nano-cavity mediated Purcell enhancement of Er in TiO2 thin films grown via atomic layer deposition

Cheng Ji, Michael Solomon, Gregory Grant, Koichi Tanaka, Muchuan Hua, Jianguo Wen, Alan Dibos, Supratik Guha

Proceedings Volume PC12911, PC129111B (2024) https://doi.org/10.1117/12.3014142

KEYWORDS: Atomic layer deposition, Thin films, Titanium dioxide, Thin film growth, Erbium, Quantum nanophotonics, Quantum enhancement, Doping, Transmission electron microscopy, Surface roughness

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Proceedings Article | 13 June 2023 Presentation + Paper

Optical properties of Er ion doped TiO2 with atomic layer deposition

Cheng Ji, Gregory Grant, Manish Singh, Sagar Seth, Koichi Tanaka, Alan Dibos, Supratik Guha

Proceedings Volume 12517, 1251702 (2023) https://doi.org/10.1117/12.2663023

KEYWORDS: Erbium, Thin films, Atomic layer deposition, Ions, Doping, Quantum emitters, Quantum processes, Quantum memory, Optical properties, Bragg cells

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Proceedings Article | 12 April 2021 Presentation

Quenching of single photon avalanche photodiodes with dynamic resistive switches

Jiyuan Zheng, Xingjun Xue, Yuan Yuan, Keye Sun, Cheng Ji, Daniel Rosenmann, Joe Campbell, Supratik Guha

Proceedings Volume 11721, 117210E (2021) https://doi.org/10.1117/12.2587864

KEYWORDS: Quenching (fluorescence), Switches, Resistors, Avalanche photodiodes, Single photon, Resistance, Switching, Stereoscopy, Quantum communications, Oxides

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Proceedings Article | 5 March 2021 Presentation

Fast speed single-photon avalanche photodiode based on a novel smart quenching method

Jiyuan Zheng, Xingjun Xue, Yuan Yuan, Keye Sun, Daniel Rosenmann, Joe Campbell, Supratik Guha

Proceedings Volume 11690, 116900P (2021) https://doi.org/10.1117/12.2576738

KEYWORDS: Quenching (fluorescence), Avalanche photodiodes, Resistance, Resistors, Switches, Stereoscopy, Quantum communications, Ionization, Fluorescence spectroscopy

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Proceedings Article | 10 October 2018 Presentation + Paper

BLUEWATER EYE: using satellite as a low cost water pollution sensor: analytics for deriving long term pollution insights based on mapping water turbidity

Sukanya Randhawa, Ranjini Guruprasad, Srinivas Rao Balivada, Priyank Hirani, Supratik Guha

Proceedings Volume 10783, 107831D (2018) https://doi.org/10.1117/12.2325589

KEYWORDS: Pollution, Satellites, Eye, Water contamination, Analytics, Sensors, Ecosystems, Remote sensing, Associative arrays, Reflectivity

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Bluewater EYE analytics bring the power of remote sensing backed by artificial intelligence to address several water pollution related challenges at low cost as it requires minimal calibration with Internet of Things (IoT) data and can provide useful water quality insights via spatio-temporal pollution signatures mapped over possibly large distances, applicable to any global water body. We leverage geo-spatial data analytics in combination with cloud based, real-time in-situ sensing, that is capable of mapping changes in water turbidity of a water resource. Spatio-temporal pollution insights are derived and represented via color-based heatmaps and matrices that are overlaid on Google maps and facilitate visualization and identification of pollution hotspots. Methods include first-order correlations derived from surface reflectance of different satellite band/s (single or a normalized difference combination) and high resolution, geo-tagged, in-situ turbidity sensing via a moving multi-parameter sensor platform. Significant improvements in correlation (upto 80%) were obtained by using statistical methods such as moving average for filtering out the sensing data associated noise. Moreover, we use machine learning based approach for training a turbidity model based on Support vector machine (SVM) regression with Radial Basis Kernel (RBF). The predicted turbidity values for the selected region based on Landsat 8 Level 2 surface reflectance data, was then applied for time-series data for historical years of 2016 and 2017. The turbidity time series so obtained is analyzed to capture any significant variations in water quality due to various factors (event or season based). We propose a method to analyze pollution contributions from different individual sources, that is based on assigning an individual spatio-temporal signature in the form of a color-coded matrix. Overall, Bluewater EYE could be useful for capturing water quality spatio-temporal information and trends, providing data driven proofs for timely alerts and advisory and other useful insights for implementation of appropriate remediation measures and interventions– all this at an affordable cost.

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