Dr. Sudip J. Gurung Profile

Dr. Sudip J. Gurung

Research Associate

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Publications (11)

Proceedings Article | 9 March 2024 Presentation

Controllable optical nonlinearity and ultrafast electron dynamic of epsilon-near-zero materials

Quynh Dang, Sudip Gurung, Aleksei Anopchenko, Kent Nguyen, Ho Wai Howard Lee

Proceedings Volume PC12884, PC128840I (2024) https://doi.org/10.1117/12.3010797

KEYWORDS: Nonlinear optics, Ultrafast phenomena, Thin films, Optical properties, Optical fibers, Light absorption, Quantum enhancement, Oxides, Zinc oxide, Titanium

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Proceedings Article | 5 October 2023 Presentation

Interplay between conduction and valence band electrons in nonlinear absorption of epsilon-near-zero oxides

Quynh Dang, Sudip Gurung, Aleksei Anopchenko, Ho Wai Howard Lee

Proceedings Volume PC12648, PC126480C (2023) https://doi.org/10.1117/12.2679134

KEYWORDS: Electrons, Absorption, Oxides, Photonics, Light absorption, Conduction bands, Saturable absorption, Pulse signals, Laser frequency, Transparent conducting oxide

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Proceedings Article | 5 October 2023 Presentation

Experimental demonstration of deep learning enabled ultra-broadband epsilon-near-zero perfect absorbers

David Dang, Sudip Gurung, Juan Manuel Raffo Calixto, Xuguo Zhou, Aleksei Anopchenko, Howard Lee

Proceedings Volume PC12648, PC1264807 (2023) https://doi.org/10.1117/12.2678517

KEYWORDS: Deep learning, Thin films, Light absorption, Design and modelling, Multilayers, Film thickness, Thermography, Solar energy, Optical properties, Optical communications

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Proceedings Article | 5 October 2023 Presentation

Epsilon-near-zero optics in planar and optical fiber platforms

Howard Lee, Aleksei Anopchenko, Christopher Gonzalez, David Dang, Quynh Dang, Stuart Love, Leon Zhang, Sudip Gurung, Kent Nguyen, Tiger Chen, Juan Manuel Raffo Calixto, Sudarsh Kunnavakkam, Andrew Palmer

Proceedings Volume PC12648, PC1264806 (2023) https://doi.org/10.1117/12.2678208

KEYWORDS: Optical fibers, Nonlinear optics, Optical properties, Thin films, Quantum optics experiments, Quantum enhancement, Quantum confinement, Atomic layer deposition, 2D materials, Zinc oxide

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Discovery of novel active materials is fundamental for photonic applications. The epsilon-near-zero (ENZ) materials have been shown to be as one of the most promising optical materials in the recent years as the electromagnetic field inside media with near-zero permittivity has been shown to exhibit unique optical properties, including strong electromagnetic wave confinement, enhanced quantum emission near ENZ media, non-reciprocal magneto-optical effects, unique topological properties, and abnormally large optical nonlinearity. While ENZ optics have been investigated extensively in the last few years, the current commonly used ENZ materials suffer from limited optical enhancement because of the lack of precise control of ENZ frequency, loss, and thickness for efficient ENZ mode excitation. In addition, the active tunability and enhanced nonlinearity and emission properties in ENZ materials have yet been fully experimentally explored. This talk will review our recent studies on the active linear, nonlinear, and emission properties of conducting oxide and metallic nitride epsilon-near-zero materials in planar and optical fiber platforms [1-7]. I will present a method to engineer the field intensity enhancement of the Al-doped zinc oxide (AZO) ENZ thin films synthesized by atomic layer deposition (ALD) technique. I will then discuss the observation of abnormal nonlinear temporal dynamic of hot electrons and enhanced optical nonlinearity in AZO and ITO ENZ thin films under different pump fluences and excitation angles using a degenerate pump-probe spectroscopy technique. I will present the first comprehensive study of photoluminescence from a 2D material placed near ENZ films and its dependence on the losses of materials, as well as the spectral response of such emitters with excitation wavelengths across the ENZ regime. Finally, I will also discuss the first experimental demonstration of optically confined ENZ resonance excitation in an optical fiber waveguide uniformly coated with AZO nanolayer. These studies enrich the fundamental understanding of emission and nonlinear properties on ENZ thin films and the integration of ENZ materials and optical fiber will open the path to revolutionary ultracompact in-fiber optical devices for optical communication, imaging, sensing/laser applications.

Proceedings Article | 13 October 2022 Presentation

Enhanced optical nonlinearity and carrier dynamics in nano-engineered epsilon-near-zero materials (Conference Presentation)

Howard Lee, Sudip Gurung, Subhajit Bej, Aleksei Anopchenko, Kent Nguyen

Proceedings Volume PC12196, PC1219604 (2022) https://doi.org/10.1117/12.2633780

KEYWORDS: Nonlinear optics, Carrier dynamics, Thin films, Atomic layer deposition, Zinc oxide, Ultrafast phenomena, Spectroscopy, Oxides, Optical properties, Magneto-optics

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Proceedings Article | 3 August 2021 Presentation

Enhancement of optical nonlinearity and spontaneous emission in nano-engineered epsilon-near-zero materials

Howard Lee, Sudip Gurung, Khant Minn, Aleksei Anopchenko, Subhajit Bej

Proceedings Volume 11797, 117971E (2021) https://doi.org/10.1117/12.2594948

KEYWORDS: Nonlinear optics, Thin films, Atomic layer deposition, Zinc oxide, Spectroscopy, Oxides, Optical properties, Magneto-optics, Luminescence, Electrons

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Proceedings Article | 5 March 2021 Presentation

Hybrid planar and optical fiber waveguides integrated with epsilon-near-zero materials

Jingyi Yang, Indra-Mani Ghimire, Sudip Gurung, Khant Minn, Aleksei Anopchenko, Howard Lee

Proceedings Volume 11689, 116890W (2021) https://doi.org/10.1117/12.2578367

KEYWORDS: Plasmonics, Waveguides, Optical fibers, Scientific research, Resonators, Optical imaging, Optical components, Optical communications, Integrated optics, Directional couplers

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Proceedings Article | 8 March 2019 Presentation

Tuning the epsilon-near-zero region of ultra-thin Al-doped ZnO through atomic layer deposition (Conference Presentation)

Garand Tyson, Sudip Gurung, Subhajit Bej, Aleksei Anopchenko, Howard Lee

Proceedings Volume 10919, 1091929 (2019) https://doi.org/10.1117/12.2508887

KEYWORDS: Atomic layer deposition, Zinc oxide, Dielectrics, Nanolithography, Fabrication, Chemical vapor deposition, Silica, Water, Spectroscopic ellipsometry, Refractive index

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Proceedings Article | 8 March 2019 Presentation

Tunable conducting oxide epsilon-near-zero meta-devices (Conference Presentation)

Aleksei Anopchenko, Subhajit Bej, Sudip Gurung, Jingyi Yang, Long Tao, Catherine Arndt, Howard Lee

Proceedings Volume 10919, 1091927 (2019) https://doi.org/10.1117/12.2508627

KEYWORDS: Oxides, Nanofabrication, Nonlinear optics, Wavefronts, Transparent conducting oxide, Beam steering

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Proceedings Article | 5 March 2019 Presentation

Epsilon-near-zero and metasurface optics in extreme optical fiber platforms (Conference Presentation)

Jingyi Yang, Indra Ghimire, Khant Minn, Aleksei Anopchenko, Sudip Gurung, Subhajit Bej, Catherine Arndt, Long Tao, Howard Lee

Proceedings Volume 10914, 1091407 (2019) https://doi.org/10.1117/12.2508734

KEYWORDS: Optical fibers, Optical components, Optical properties, Oxides, Prisms, Lenses, Refractive index, Wavefronts, Magneto-optics, Nonlinear optics

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Metasurfaces that can refract and focus light in unique ways provide the opportunity for advanced light manipulation and development of novel applications. Due to the flat nature of metasurfaces (typical thickness < 100nm), conventional three-dimensional optical elements such as prisms or lenses could be replaced by flat, low-profile, and low-cost versions. In addition, the optical response of near-zero refractive index metasurface systems, i.e., vanishing permittivity and permeability values, have been shown to exhibit unique optical properties. Those features can be exploited in various optical applications such as wavefront engineering, radiation pattern tailoring, non-reciprocal magneto-optical effects, nonlinear ultrafast optical switching, and broadband perfect absorption. However, most of the studies on epsilon-near-zero (ENZ) optical properties are limited to the excitation of ENZ mode in the planar structures or meta-surfaces with short interaction length, restricting the excitation platform for novel optical device applications. In this talk, I will report a novel optical waveguide design of a hollow step index fiber modified with a thin layer of conducting oxide epsilon-near-zero materials. We show an excitation of highly confined waveguide mode in the proposed fiber near the wavelength where permittivity of conducting oxide material approaches zero [1]. I will present our study on “meta”-optical fiber by integrating metasurfaces with optical fibers to develop novel and ultracompact in-fiber optical devices such as an optical fiber metalens and color filter [2,3]. These advanced “meta”/ENZ-optical fibers open the path to revolutionary in-fiber optical imaging and communication devices. 1. K. Minn, A. Anopchenko, J. Yang, H. W. Lee, “Excitation of epsilon-near-zero resonance in ultra-thin indium tin oxide shell embedded nanostructured optical fiber,” Nature Scientific Reports 8, 2342 (2018). 2. J. Yang, I Ghirmire, P. C. Wu, S. Gurung, C. Arndt, D. P. Tsai, H. W. Lee, “Photonic crystal fiber metalens”, submitted (2018). 3. Indra Ghimire, Jingyi Yang, Sudip Gurung, Satyendra K. Mishra and Ho Wai Howard Lee,” Polarization dependent photonic crystal fiber color filter using asymmetric metasurfaces,” Submitted (2018)

Proceedings Article | 4 March 2019 Presentation

Plasmonic- and meta-photonic crystal fiber for advanced optical sensing (Conference Presentation)

Jingyi Yang, Indra Ghimire, Khant Minn, Sudip Gurung, Zhenrong Zhang, Howard Lee

Proceedings Volume 10894, 108940Y (2019) https://doi.org/10.1117/12.2508740

KEYWORDS: Optical sensing, Optical fibers, Crystals, Plasmonics, Dielectrics, Optical filters, Oxides, Photonic crystal fibers, Nonlinear optics, Wavefronts

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Showing 5 of 11 publications

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