Terahertz Antenna Impedance Matched to a Graphene Photodetector
arXiv:2405.06579 · doi:10.1021/acsaelm.4c00870
Abstract
Developing low-power, high-sensitivity photodetectors for the terahertz (THz) band that operate at room temperature is an important challenge in optoelectronics. In this study, we introduce a photo-thermal-electric (PTE) effect detector based on quasi-free standing bilayer graphene (BLG) on a silicon carbide (SiC) substrate, designed for the THz frequency range. Our detector's performance hinges on a quasi-optical coupling scheme, which integrates an aspherical silicon lens, to optimize impedance matching between the THz antenna and the graphene p-n junction. At room temperature, we achieved a noise equivalent power (NEP) of less than 300 . Through an impedance matching analysis, we coupled a planar antenna with a graphene p-n junction, inserted in parallel to the nano-gap of the antenna, via two coupling capacitors. By adjusting the capacitors and the antenna arm length, we tailored the antenna's maximum infrared power absorption to specific frequencies. The sensitivity, spectral properties, and scalability of our material make it an ideal candidate for future development of far-infrared detectors operating at room temperature.
arXiv comment21 pages, 4 figures
References in corpus (15)
- Thermoelectric and Magnetothermoelectric Transport Measurements of Graphene
- Sensitive Room-Temperature Terahertz Detection via Photothermoelectric Effect in Graphene
- Dual-gated bilayer graphene hot electron bolometer
- Hydrodynamics of electrons in graphene
- Resonant Terahertz Detection Using Graphene Plasmons
- Fast and Sensitive Terahertz Detection Using an Antenna-Integrated Graphene pn Junction
- Theory of thermopower in 2D graphene
- High performance bilayer-graphene Terahertz detectors
- Epitaxial graphene quantum dots for high-performance THz bolometers
- Dual Origin of Room Temperature Sub-Terahertz Photoresponse in Graphene Field Effect Transistors
- Thermoelectric Transport of Massive Dirac Fermions in Bilayer Graphene
- Ultrafast, Zero-Bias, Graphene Photodetectors with Polymeric Gate Dielectric on Passive Photonic Waveguides
- Towards quantum-limited coherent detection of terahertz waves in charge-neutral graphene
- Ultralow-noise terahertz detection by p-n junctions in gapped bilayer graphene
- Terahertz rectennas on flexible substrates based on one-dimensional metal-insulator-graphene diodes