13:15 〜 13:45
▲ [19p-E215-2] [INVITED] Tunable terahertz vortex source based on difference frequency generation
キーワード：optical vortex, terahertz, difference frequency generation
An optical vortex carries an annular intensity profile and an orbital angular momentum, characterized by a topological charge ℓ, owing to its helical wavefront, and it provides us a variety of potential research opportunities, including chiral fabrications, high-speed communications and scanning microscopes with a spatial resolution beyond the diffraction limit. The above-mentioned applications require strongly frequency versatility of the vortex light sources, thus, a THz vortex source will offer entirely new fundamental sciences and advanced technologies for THz photonics.
To date, we have successfully developed THz vortex sources by employing a Tsurupica vortex phase plate (VPP). However, the VPP is typically designed for a specific frequency, and it inherently constrains the frequency versatility of THz vortex sources.
In this presentation, we propose a novel THz vortex source based on a difference frequency generator (DFG) formed of a 4’-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystal. This system exhibited an extremely wide tunability in a frequency range of 2-6 THz.
To date, we have successfully developed THz vortex sources by employing a Tsurupica vortex phase plate (VPP). However, the VPP is typically designed for a specific frequency, and it inherently constrains the frequency versatility of THz vortex sources.
In this presentation, we propose a novel THz vortex source based on a difference frequency generator (DFG) formed of a 4’-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystal. This system exhibited an extremely wide tunability in a frequency range of 2-6 THz.