Development of Metallic Metamaterial-based Sheet-beam THz Source
Abstract
In this proposal, we propose a metallic metamaterial-based modified grating circuit for potentially improved beam transmission, higher beam-interaction impedance and also for the capability to integrate with a sheet-electron beam. We reported this concept in Optics Express (2014) in a numerical approach. The circuit is a modified grating structure where electromagnetic wave can be controlled in a way to form a stronger surface wave so that higher interaction impedance is feasible. In this structure, an improved beam transmission with sheet-beam is anticipated as seen from conventional Smith-Purcell devices and other diffraction devices. An approach to improve the current density of the cathode will be employed by a tungsten nano-particle-based cathode which was developed in-house to be more than 100 A/cm2 and its operating temperature was reduced to the level of 800°C. To overcome the thermal issues, we may employ a graphene film-based cold cathode developed in-house. An emission current density of ~10,000A/cm2 and ~50 days of life test has been achieved.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 09, 2018
- Source ID
- FA23861714062
Entities
People
- Gun-Sik Park
Organizations
- Air Force Office of Scientific Research
- Seoul National University
- United States Air Force