- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Microring resonator-based photonic system for terahertz signal generation
摘要： We propose a photonic system based on add–drop microring resonator and mode-locked laser for terahertz (THz) signal generation. A mode-locked laser acts as an input source to the microring resonator. The transfer characteristics of the microring resonator generate Lorentzian shaped pulses at the output ports of the microring resonator. These series of pulses obtained are then investigated in two approaches; in the ?rst approach, the output of the microring resonator is given to a photodetector which generates 33 THz pulses separated by a spacing of 1 THz with a full width at half maximum (FWHM) of 0.15 THz. In the second approach, the output of the microring resonator is given to an optical ?lter to extract a particular frequency component. In this case, a single THz carrier with a FWHM of 0.2618 THz is obtained. The THz frequency components generated by the proposed photonic system can act as carriers for communication between the indoor user and the base station of a pico/femto cell in a 5G environment.
关键词： THz signal generation,Microwave photonics,Microring resonator,Frequency comb generation,Mode-locked laser
更新于2025-09-10 09:29:36
-
[IEEE 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz2018) - Nagoya, Japan (2018.9.9-2018.9.14)] 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - All-optical phase control of THz waveforms
摘要： We demonstrate all-optical broadband phase control of THz pulses. By spatially patterning a fs pump pulse we inject photoconductive regions inside a silicon-filled THz parallel-plate waveguide (PPWG), defining light-induced THz quasi-optical components within the waveguide. We show carrier envelope phase shifts of single-cycle THz pulses as well as synthesis of chirped waveforms, including a negative chirp of -11 GHz/ps between 0.3 and 0.5 THz.
关键词： phase control,waveguide,THz,chirped waveforms,all-optical
更新于2025-09-10 09:29:36
-
Characterization and Integration of Terahertz Technology within Microfluidic Platforms
摘要： In this work, the prospects of integrating terahertz (THz) time-domain spectroscopy (TDS) within polymer-based microfluidic platforms are investigated. The work considers platforms based upon the polar polymers polyethylene terephthalate (PET), polycarbonate (PC), polymethyl-methacrylate (PMMA), polydimethylsiloxane (PDMS), and the nonpolar polymers fluorinated ethylene propylene (FEP), polystyrene (PS), high-density polyethylene (HDPE), and ultra-high-molecular-weight polyethylene (UHMWPE). The THz absorption coefficients for these polymers are measured. Two microfluidic platforms are then designed, fabricated, and tested, with one being based upon PET, as a representative high-loss polar polymer, and one being based upon UHMWPE, as a representative low-loss nonpolar polymer. It is shown that the UHMWPE microfluidic platform yields reliable measurements of THz absorption coefficients up to a frequency of 1.75 THz, in contrast to the PET microfluidic platform, which functions only up to 1.38 THz. The distinction seen here is attributed to the differing levels of THz absorption and the manifestation of differing f for the systems. Such findings can play an important role in the future integration of THz technology and polymer-based microfluidic systems.
关键词： lab-on-a-chip,THz time-domain spectroscopy,microfluidics,polymer absorption
更新于2025-09-10 09:29:36
-
Real-time signal processing for sub-THz range grating-based distributed fiber sensing
摘要： Distributed optical fiber sensors are an increasingly utilized method of gathering distributed strain and temperature data. However, the large amount of data they generate presents a challenge that limits their use in real-time, in situ applications. This article describes a parallel and pipelined computing architecture that accelerates the signal-processing speed of sub-terahertz fiber sensor arrays, maintaining high spatial resolution while allowing for expanded use of real-time sensing and control applications. The computing architecture described was successfully implemented in a field programmable gate array chip. The signal processing for the entire array takes only 12 system clock cycles. In addition, this design removes the necessity of storing any raw or intermediate data.
关键词： distributed optical fiber sensors,real-time signal processing,sub-THz range,FPGA,grating-based
更新于2025-09-10 09:29:36
-
[IEEE 2018 10th International Conference on Information Technology and Electrical Engineering (ICITEE) - Bali, Indonesia (2018.7.24-2018.7.26)] 2018 10th International Conference on Information Technology and Electrical Engineering (ICITEE) - Cascaded-optimum Matching Layer for Planar Bowtie Terahertz Antenna on Extended Hemispherical High Dielectric Lens
摘要： Development of THz technology has been an interest research topic over the past decade due to its unique radiation characteristic. Recent development in THz technology enables THz radiation for various imaging applications such as remote sensing, biomedical and security detection because it has decent advantages over the old techniques of X-Ray and microwave imaging. For imaging applications, a system must meet the requirement of a high gain or narrow beamwidth radiation to produce a high-resolution spectra output. A high radiation efficiency is also the considered parameter because it will affect the amount of the radiated energy to the target. The matching layer (ML) technique is a common technique to minimize the internal reflections and improve the radiation efficiency performance of the optical based antenna such as lens. In the previous research, we have studied a bow-tie planar antenna combined with Silicon dielectric substrate and extended hemispherical lens for 1 THz resonant frequency. The ML method has also been applied in both single and cascaded technique to increase the radiation efficiency. However, the complexity of the design is one of the main concern because high number of stacked MLs used to achieve maximum radiation efficiency. In this paper, we study the effect of an optimum ML to the lens antenna. An optimum ML has different layer thickness among the lens surface to covers the different angle of incidence. From the simulation results, radiation efficiency can be increased up to 92.06% while the high gain performance can be kept consistent around 32 dB with a narrow beamwidth of below (cid:2)(cid:3). It shows that our proposed design is suitable for future THz imaging applications.
关键词： internal reflections,THz imaging,Silicon,matching layer
更新于2025-09-10 09:29:36
-
[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Measurement of the Rydberg Constant with Trapped Rydberg Atoms
摘要： A measurement of the Rydberg constant using cold circular Rydberg atoms is proposed. Since these atoms have long lifetimes, negligible quantum electrodynamics and no nuclear-overlap corrections, the measurement can shed new light on the “proton radius puzzle”. The atoms are trapped in an optical lattice. Transitions are driven using a lattice-modulation technique to perform Doppler-free sub-THz spectroscopy; the transition frequencies yield the Rydberg constant. The selected transitions are free of ?rst-order Zeeman and Stark shifts. Systematic uncertainties due to lattice-induced shifts, core-polarization, second-order Zeeman and Stark shifts, etc are estimated.
关键词： optical lattice,proton radius,sub-THz spectroscopy,Rydberg constant,precision measurements,Rydberg atoms
更新于2025-09-10 09:29:36
-
[IEEE 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz2018) - Nagoya, Japan (2018.9.9-2018.9.14)] 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Studying Solvation by Non-linear THz Spectroscopy
摘要： We are using non-linear THz spectroscopy to study the ultrafast solvation dynamics of water. Hydrogen bond rearrangements via librational or diffusional motions constitute the heart of network dynamics in liquid water. Reorientation of water molecules on the ps and sub-ps time scale is a decisive step in the formation and breaking of hydrogen bonds. Here we report the results of ultrafast nonlinear THz experiments.
关键词： solvation dynamics,ultrafast dynamics,non-linear THz spectroscopy,hydrogen bond
更新于2025-09-10 09:29:36
-
High power THz-range Wave generation based on Transformation of Plasma Waves Pumped by High-current Relativistic Electron Beam
摘要： The beam-plasma interaction system allows one to generate high-power sub-mm waves (frequency interval 0.1÷1 THz) by usage of mechanism of plasma wave transformation [1]. This way gives possibility to achieve multi megawatt power with the promptly varying frequency that can be necessary for various practical applications. The original project of a sub-mm wave based on transformation of plasma waves pumped by a kA-current relativistic electron beam is developed at the GOL-PET facility. We present novel results on the study of mechanisms of sub-mm wave emission by the processes of plasma wave transformation in electromagnetic one in case of the strong beam-plasma interaction.
关键词： sub-mm wave generation,plasma waves,beam-plasma interaction,relativistic electron beam,THz-range
更新于2025-09-10 09:29:36
-
[IEEE 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - Kiev (2018.4.24-2018.4.26)] 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - Generation of THz-Frequency Electromagnetic Signals in Antiferromagnetic Nano-Oscillators
摘要： Existing techniques of the THz-frequency signals generation require complex experimental setups and usually can not be realized even at micron scale. In contrast to this recently it was shown that a thin antiferromagnetic (AFM) layer covered by a thin metal layer having a strong spin-orbital coupling and biased by a dc current can be used as a nano-scale source of the electromagnetic ac signals with frequencies close to the eigenfrequencies of AFM material (typically 0.1–10 THz). In this paper we theoretically analyze and compare performance of such THz-frequency sources based on three different mechanisms of ac signal power extraction realized via the inverse spin Hall effect, magnetic dipole emission and via THz-frequency variations of the tunneling anisotropic magnetoresistance in AFM tunnel junction. Our calculations show that the second mechanism (magnetic dipole emission) could be preferable and could provide an output ac power about several microwatts in the frequency range 0.5 – 2 THz.
关键词： THz-frequency signal,spin Hall oscillator,antiferromagnet,ac power
更新于2025-09-10 09:29:36
-
Spectral measurements of THz radiation emitted from intrinsic Josephson junction stacks
摘要： A superconducting integrated receiver (SIR) comprises all of the elements needed for heterodyne detection on a single chip. Recently, the SIR was successfully implemented for the first spectral measurements of terahertz (THz) radiation emitted from intrinsic Josephson junction stacks (BSCCO mesa) at frequencies up to 750 GHz; a linewidth below 10 MHz has been recorded in the high bias regime. In this report the results of the spectral measurements of THz radiation emitted from intrinsic Josephson junction stacks are summarized; recent results of spectrometric gas detection using THz radiation from a BSCCO mesa are presented.
关键词： BSCCO mesa,spectral measurements,heterodyne detection,intrinsic Josephson junction stacks,THz radiation
更新于2025-09-10 09:29:36