A near-field edge-coupled photoconductive free-space linear tapered slot antenna has been constructed as a planar alternative to the standard photoconductive switch coupled to a silicon substrate lens. The temporal response along the optical axis is investigated to ensure the structure itself does not introduce pulse distortion which would fundamentally limit the usefulness of the structure. Experimental results show that a 1.6 THz bandwidth with a ≈50dB dynamic range is achievable with the new structure which is comparable to our reference experiment with a standard silicon substrate lens. The investigated structure has the added benefit of a potential substantial physical size reduction and can also be used to excite waveguides in the near-field.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.25.010118 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Two-dimensional molybdenum ditelluride waveguide-integrated near-infrared photodetector.
Nanotechnology
March 2024
State Key Laboratory of ASIC and System, Shanghai Institute of Intelligent Electronics & Systems, School of Microelectronics, Fudan University, 200433 Shanghai, People's Republic of China.
Low-cost, small-sized, and easy integrated high-performance photodetectors for photonics are still the bottleneck of photonic integrated circuits applications and have attracted increasing attention. The tunable narrow bandgap of two-dimensional (2D) layered molybdenum ditelluride (MoTe) from ∼0.83 to ∼1.
View Article and Find Full Text PDFOn-Chip Time-Domain Terahertz Spectroscopy of Superconducting Films below the Diffraction Limit.
Nano Lett
May 2023
Department of Physics, University of California at Santa Barbara, Santa Barbara California 93106, United States.
Free-space time domain THz spectroscopy accesses electrodynamic responses in a frequency regime ideally matched to interacting condensed matter systems. However, THz spectroscopy is challenging when samples are physically smaller than the diffraction limit of ∼0.5 mm, as is typical, for example, in van der Waals materials and heterostructures.
View Article and Find Full Text PDFHigh Responsivity Vacuum Nano-Photodiode Using Single-Crystal CsPbBr Micro-Sheet.
Nanomaterials (Basel)
November 2022
State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China.
Field electron emission vacuum photodiode is promising for converting free-space electromagnetic radiation into electronic signal within an ultrafast timescale due to the ballistic electron transport in its vacuum channel. However, the low photoelectric conversion efficiency still hinders the popularity of vacuum photodiode. Here, we report an on-chip integrated vacuum nano-photodiode constructed from a Si-tip anode and a single-crystal CsPbBr cathode with a nano-separation of ~30 nm.
View Article and Find Full Text PDFMillimeter-Wave Permittivity Variations of an HR Silicon Substrate from the Photoconductive Effect.
Micromachines (Basel)
October 2022
ULTIMETAS, 75020 Paris, France.
The photoinduced microwave complex permittivity of a highly resistive single-crystal silicon wafer was extracted from a bistatic free-space characterization test bench operating in the 26.5-40 GHz frequency band under CW optical illumination at wavelengths of 806 and 971 nm. Significant variations in the real and imaginary parts of the substrate's permittivity induced by direct photoconductivity are reported, with an optical power density dependence, in agreement with the theoretical predictions.
View Article and Find Full Text PDFWe demonstrate a free space two-port photonic vector network analyzer capable of measuring the scattering parameters of devices and materials in the terahertz range with a frequency coverage of 0.2 - 2 THz in a single system. It is based on photoconductive terahertz sources and detectors driven by a telecom-wavelength femtosecond laser.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!