Message from Division Chair
Atomic, Molecular, Optical, and Plasma (AMOP) Physics fundamentally studies light, matter, and interactions at atomic and molecular levels. It deals with protons, electrons, ions, and their collective behavior in response to electric and magnetic fields. AMOP encompasses a broad area including but not limited to the following disciplines:
- Generation of light-source, ultrafast laser, and applications
- Light-induced emergent behavior in quantum materials
- Non-linear optics, biomedical optics and nano-optics
- Plasma physics – laboratory, space, and astrophysical
- The behavior of atoms in an ultracold, ground, and excited state
- Terahertz physics, metamaterials, and nanophotonic structures
- Precision measurement, quantum information, and sensing
- Plasma–matter interaction and applications
- Ultrafast Spectroscopy
The AMOP division was established from the outset of the first ANPA conference, aiming to bring together students and researchers – both from academia and industry to present and discuss their research, innovation, and technology related to AMOP physics, fostering knowledge exchange and collaboration within the community and across the globe. We cordially invite researchers, scientists, and experts from various disciplines for abstract submission and look forward to seeing your exciting science during the conference.
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Invited Speaker
Insights into Plasma Microbubbles: Electrohydrodynamic Pathways for Enhanced Gas–Liquid Interactions
This study explains the dynamic behaviour and mass transfer mechanisms of plasma-activated microbubbles, demonstrating superiority over conventional systems. The formation, rise, and burst of bubbles under plasma-on and plasma-off conditions in glycerol–water and SDS solutions were investigated through high-speed visualization, force balance modelling, local energy dissipation analysis, and examination of vibration and turbulence. Moderately high rotational temperature and electron density such as in a gliding arc discharge, significantly affected bubble hydrodynamics. Plasma microbubbles act as mobile microreactors that continuously renew the gas–liquid interface and increase the effective reactive area, in contrast to traditional plasma irradiation, which is limited by a static interface. By lengthening the route through induced turbulence and improving interface renewal, plasma activation prolonged bubble residence time, enhancing reactive species transfer even at shorter detachment times. Bubble size was decreased by plasma activation, which also improved energy conversion and increased local energy dissipation by 40%. Less viscous media showed higher mass transfer and shorter absorption times, with sono-chemical effects reinforcing plasma-driven chemistry via cavitation. Mass transfer and reactive species delivery enhanced by electrohydrodynamic stresses, interfacial charge dynamics, and cavitation rendering plasma-activated microbubbles a crossroads of fluid dynamics and plasma physics for new environmental, chemical, and energy applications.
Division Schedule
Please look below for detailed schedule.
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Abstract Number: ANPA2026N0008 Presenting Author: Pradeep Lamichhane (Invited) Co-Authors: nan Presenter's Affiliation: University of Warwick,UK Title: Insights into Plasma Microbubbles: Electrohydrodynamic Pathways for Enhanced Gas–Liquid Interactions Location: Virtual Presentation Show/Hide Abstract This study explains the dynamic behaviour and mass transfer mechanisms of plasma-activated microbubbles, demonstrating superiority over conventional systems. The formation, rise, and burst of bubbles under plasma-on and plasma-off conditions in glycerol–water and SDS solutions were investigated through high-speed visualization, force balance modelling, local energy dissipation analysis, and examination of vibration and turbulence. Moderately high rotational temperature and electron density such as in a gliding arc discharge, significantly affected bubble hydrodynamics. Plasma microbubbles act as mobile microreactors that continuously renew the gas–liquid interface and increase the effective reactive area, in contrast to traditional plasma irradiation, which is limited by a static interface. By lengthening the route through induced turbulence and improving interface renewal, plasma activation prolonged bubble residence time, enhancing reactive species transfer even at shorter detachment times. Bubble size was decreased by plasma activation, which also improved energy conversion and increased local energy dissipation by 40%. Less viscous media showed higher mass transfer and shorter absorption times, with sono-chemical effects reinforcing plasma-driven chemistry via cavitation. Mass transfer and reactive species delivery enhanced by electrohydrodynamic stresses, interfacial charge dynamics, and cavitation rendering plasma-activated microbubbles a crossroads of fluid dynamics and plasma physics for new environmental, chemical, and energy applications.
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Abstract Number: ANPA2026N00012 Presenting Author: Tikaram Neupane Co-Authors: Bhoj R. Gautam; Peshal Karki; Tyler Kossover; Uma Poudyal Presenter's Affiliation: The University of North Carolina at pembroke Title: Comparative Study of Third-order Nonlinear Refraction in MEH-PPV And PBDB-T Polymers Location: Virtual Presentation Show/Hide Abstract Third-order nonlinear optical processes in organic semiconducting polymers continue to attract significant attention due to their pivotal role in all-optical signal processing, ultrafast photonics, and nonlinear beam control applications. In this work, we compare nonlinear refraction coefficients of two polymers, specifically MEH-PPV and PBDB-T, using a 532 nm CW laser via the spatial self-phase modulation (SSPM) technique. SSPM of the optical field in liquid suspensions of these polymers produces multiple concentric diffraction rings in the far field due to the laser-induced intensity-dependent refractive index in the materials. These rings arise from the coherent superposition of transverse wave vectors. The nonlinear refractive index of the materials was estimated by analyzing the number of rings as a function of incident intensity, and the NLR coefficients of MEH-PPV and PBDB-T are determined to be approximately 1.2 × 10?¹? m²/W and 1.5 × 10?¹? m²/W, respectively. The temporal behavior of the diffraction rings reveals distinct phases: initial spatial alignment of polymers upon excitation, a peak number of rings at intermediate times, and thermal distortion, particularly in the upper vertical rings, during prolonged laser exposure. This vertical asymmetry in the diffraction pattern indicates phase distortion caused by disruption of the coherent superposition of transverse wave vectors due to localized thermal vortices in the polymer aqueous solution, offering novel platforms for thermal metrology based on localized optical nonlinearity and temperature-sensitive all-optical switching. Acknowledgment: This work was supported by the Department of Chemistry and Physics at UNCP and by the DOE BES under Award No. DE-SC0024611 at FSU.
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Abstract Number: ANPA2026N00010 Presenting Author: Chandra P. Joshi Co-Authors: nan Presenter's Affiliation: Lenoir-Rhyne University Title: Do We Need To Extend The Electromagnetic Spectrum? Limits, Possibilities, And New Directions Location: Virtual Presentation Show/Hide Abstract The electromagnetic spectrum, spanning from radio waves to gamma rays, has long served as a complete framework for understanding radiation. However, this classification is largely shaped by our current ability to generate and detect signals, rather than by a fundamental limit of nature. This raises an important question: does electromagnetic radiation extend beyond these known boundaries, and if so, why have we not accessed it yet?
At both ends of the spectrum, there are reasons to suspect limitations in the traditional picture. Extremely low-frequency fields may behave more like coherent or quasi-static structures rather than propagating waves, while at the high-energy end, near and beyond gamma rays, quantum effects and nonlinear interactions of fields become significant. In these regimes, the classical description of radiation may no longer be sufficient, suggesting that what we define as “electromagnetic radiation” might need to be broadened.
The primary challenge lies in detection. Conventional techniques rely on energy absorption, resonance, or photon counting, all of which are optimized for known frequency ranges. Signals outside these ranges may be too weak, too coherent, or fundamentally different in nature to be observed using standard methods. This points to the need for new approaches, including quantum sensing, ultra-precision measurements, and alternative ways of interpreting field interactions.
Extending the electromagnetic spectrum could open new possibilities in communication, sensing, and imaging, while also providing deeper insight into the structure of fields and the vacuum. More importantly, it may require a shift in how radiation itself is understood—not just as waves within a fixed range, but as a broader class of field phenomena.
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Abstract Number: ANPA2026N00011 Presenting Author: Santosh Kumar Das Co-Authors: nan Presenter's Affiliation: Patan Multiple Campus, Tribhuvan University Title: Thermal and Screening Effects in Non-monochromatic Laser-Assisted, zero order Bessel ?? CO? Scattering Location: In-Person Presentation, CDP Show/Hide Abstract Laser-assisted scattering (LAS) describes the interaction of incoming particles such as electrons or ??? particles or atoms with an external non-monochromatic electromagnetic field and it has significant relevance in areas like laser cooling, medical laser applications, nanotechnology, and atomic-scale manipulation. This aim of this study is to analyze the scattering behavior of ?^- particles with CO? molecules, considering screening effects in a non- monochromatic field under thermal environment. To fulfill this objective, a theoretical framework is formulated using thermal non-monochromatic Volkov wave function, an interaction potential for CO?, screening parameters and the Kroll-Watson approximations to derive S-matrix, which is further related to T-matrix. The obtained T-matrix is directly related to differential cross-section (DCS) which help to study the scattering dynamics of ?^-particles. The develop model was computed and result shows that DCS with scattering angle in a sinusoidal pattern, while its dependence on change in momentum shows damping nature like Bessel function nature. Also, the magnitude of DCS with separation, scattered thermal energy and temperature increases but decreases with incident thermal energy. The behavior arises due to the destructive and constructive interference effect. The presence of thermal conditions strongly influences the DCS and the scattering dynamics of ?^- particles. Such phenomena are crucial in various domains, including radiation-matter interaction, nanotechnology, Plasma Physics, medical laser and helps in understanding and controlling phenomena which is in atomic scales. This analysis of DCS for CO? molecules under varying parameters can also be extended to other molecules with similar properties.
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Abstract Number: ANPA2026N0009 Presenting Author: Samjhana Dahal Co-Authors: nan Presenter's Affiliation: Tribhuvan University Title: Germination and Seedling Growth Enhancement of Timur Seed (zanthoxylum Armatum) by Using Cold Atmospheric Pressure Plasma Location: In-Person Presentation, CDP Show/Hide Abstract Timur is a plant native to the Himalayan region and it is valued for its intense citrusy and peppery flavor, used in culinary and traditional practices. In this work, we have used gliding arc discharge for direct treatment of the Timur seed (Zanthoxylum armatum) and used plasma activated water, prepared by cylindrical dielectric barrier discharge and gliding arc discharge, to irrigate the plants, aiming to enhance germination and seedling growth. The plasma sources are characterized through electrical and optical characterization methods. From spectrometer, electron temperature of cylindrical dielectric barrier discharge and gliding arc discharge is found to be 1.41 eV and 1.66 eV with plasma density found to be 8.17 × 10 18 m ?3 and 5.48 × 10 17 m?3 , respectively. Plasma treatment increases the temperature, total dissolved solids, electrical conductivity, and oxidation-reduction potential of the plasma-activated water with the activation time; however, the potential of hydrogen decreases. In addition, it has been observed that nitrate concentration is notably higher than nitrite concentration. It has been observed that the direct application of plasma on Timur seeds results in changes to the seeds, particularly in their surface properties and wettability. The results showed that the wettability of seeds using two minutes (min) plasma-activated water increases the most compared to the untreated seeds and other treatment times. Although germination enhancement of the Timur seeds is not achieved in the laboratory condition, plasma-activated water positively impacts root and shoot growth, as well as in the retention of chlorophyll content (or greenness) of leaves. A treatment time of four minutes using cylindrical dielectric barrier discharge and two minutes using plasma jet is found most favorable. The positive impact of plasma on Timur plants can be studied further to enhance germination, seedling growth, and ultimately, fruit yield, making it viable for agricultural applications in real field conditions.
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