Transmissive terahertz amplifier based on optically pumped graphene-dielectric hybrid resonators

• DOI: 10.1364/josab.444765
• Publication Date: 2021-12-03T17:30:39Z
• Authors: Shengnan Guan; Jierong Cheng; Zhiyu Tan; Fei Fan; Xianghui Wang; Shengjiang Chang
• Keywords: 0103 physical sciences; 7. Clean energy; 01 natural sciences

Amplification of terahertz radiation is achieved by combining optically pumped graphene with a dielectric resonant cavity through numerical simulation. Graphene attached to one-dimensional grating and sandwiched between two distributed Bragg reflectors. The whole enhances the interaction wave while being transparent pump light. When femtosecond pulse light at 1.5 µm peak intensity <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mn>8.7</mml:mn> </mml:mrow> <mml:mspace width="thickmathspace"/> <mml:mi mathvariant="normal">W</mml:mi> <mml:mo>/</mml:mo> <mml:msup> mathvariant="normal">m</mml:mi> <mml:mn>2</mml:mn> </mml:msup> </mml:math> considered, driven gain medium. Due enhancement proper complex conductivity graphene, amplitude transmitted beam amplified 172 times 3.82 THz room temperature, showing great potential in development amplifiers even lasers.