Detection of hazardous greenhouse gases and chemicals with topological edge state using periodically arranged cross-sections

Abstract

This study investigates a sensitive chemical and hazardous greenhouse gas sensor using ternary phononic crystals composed of periodic tubes. The sensing mechanism depends on the localization of the topological edge state at the interface between phononic crystals. The impact of the structure's geometry and concentration of a specific gas in air are discussed. Further, the effect of temperature on the position of topological edge state and the sensitivity of the proposed sensor will be studied. This model has shown good sensitivity of 1.58 Hz m-1 s and a figure of merit of 33.7 m-1 s to distinguish different chemical and hazardous greenhouse gas. Furthermore, the proposed detector is low-cost and simple because it does not require a complicated procedure to fabricate multilayers with different mechanical properties.

Studying the impact of interface roughness on a layered photonic crystal as a sensor

“…The origins of Photonic band gaps (PBGs) are the structure's periodicity, the constituent materials' nature, and the number of layers in the structure [8]. The pioneering property of PBG of the periodic structures has many applications, such as sensors, filters, switches, photonic crystal waveguides, logic gates, and various optical integrated devices [9][10][11][12][13][14][15][16]. The PhCs are now expanding numerous fields, such as quantum computing, biophotonics, and communications [11,[17][18][19].…”