Science, research, and future solutions: YSU PhD student's project

Hovsep Kashanyan, a PhD student at the YSU Institute of Physics, is among the winners of the Armenian Higher Education and Science Committee's "Research Support Program for PhD Students and Young Candidates – 2025". His research focuses on one of the fastest-growing areas in modern physics and engineering: controlling terahertz waves using metasurfaces. "The objective of my project is to develop a bilayer metasurface using VO₂ that will function as a broadband, tunable terahertz bandstop filter," Hovsep explains.

Terahertz technologies: the foundation of future communication

In recent years, the terahertz (THz) spectrum has emerged as a key area in next-generation technologies. According to Hovsep, it is distinguished by high data transfer speeds, low latency, and significant bandwidth capacity, making it a potential cornerstone for future 6G communication systems.

However, the field still faces a major challenge: the limited availability of suitable devices and metasurfaces. Hovsep Kashanyan's research aims to address this gap.

Scientific challenges and approaches

The study explores several important scientific questions. In particular, it examines the frequency characteristics of metasurface-based filters and their tunability through modifications in element shape, geometry, and structural parameters.

In addition, the project involves developing a theoretical model, optimizing the filter's performance, and analyzing the impact of environmental dielectric properties on device operation. The research also explores active tuning of the filter's frequency characteristics through adjustments in the conductivity of VO₂ layers or conductive structures.

Expected outcomes

The ultimate objective of the research is to develop a fully functional metasurface filter with high efficiency and tunable properties.

When asked about the potential practical applications of the project's findings, Hovsep noted: "These systems have significant applied value. The THz spectrum is considered the foundation for next-generation 6G communication. Currently, there is a shortage of devices and technologies in this field, so the proposed solution could become one of the technologies to fill this gap."

According to him, such systems could find wide applications across multiple fields, including telecommunications, sensor systems, and security technologies.

Research progress

The project is currently in the modeling phase, using advanced simulation tools for design, frequency analysis, and parameter optimization.

Educational path and motivation

Hovsep Kashanyan's interest in science developed at an early age, driven by a fascination with technology. Mathematics and physics were his favorite subjects at school, and their combination naturally led him to the field of radiophysics.

He is particularly interested in complex technological challenges and the process of solving them, while modern scientific problems serve as his primary source of inspiration. At the same time, one of the main challenges for the young scientist is managing his time effectively while balancing his studies with engineering work. He is currently pursuing his PhD while also working as a senior engineer.

Importance of support programs

"I value the role of programs like this for young researchers, as they provide an opportunity to bring ideas to life, offer essential resources, and foster scientific development," says the YSU PhD student. His primary goal is to fully implement the project and achieve the creation of a physically functional system.