Heat flow dynamics in planar multilayer antennas excited by far-infrared picosecond laser pulses. (11th October 2021)

• Record Type: Journal Article
• Authors: Bejide, Matias; Vantomme, André; Tung, Nguyen Thanh; Janssens, Ewald
• Is Part Of: Journal of physics. Volume 55:Number 2(2022)
• Publication Date: 2021-10-11
• Subjects: Kapitza conductance -- electron-phonon coupling -- ultrafast heating -- metamaterials -- adhesion layers; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/ac29e6
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Thin metallic buffer layers are commonly used between semiconductor substrates and noble metal films or nanostructures. We propose an extended two-temperature heat transfer model that can be used to investigate the heat flow in multilayer antennas and includes metallic layers, a dielectric substrate, and their respective interfaces. It is demonstrated how the heat flow dynamics in a layered material, excited by short laser pulses, can be controlled by the thermal properties of the buffer layer. A large buffer layer electron-phonon coupling was found to induce a non-intuitive reverse internal heat flow in the layered material and transient energy retention on time scales of a few tens of picoseconds, while the buffer layer-substrate Kapitza conductance was found to be the limiting parameter for the heat dissipation on nanosecond time scales.