A5051719610- Photonic and Optical Devices
- Photonic Crystals and Applications
- Terahertz technology and applications
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Astronomy and Astrophysical Research
- Semiconductor Lasers and Optical Devices
- Stellar, planetary, and galactic studies
- Advanced Fiber Optic Sensors
- Cosmology and Gravitation Theories
- Spectroscopy and Laser Applications
- Advanced Chemical Sensor Technologies
- Spectroscopy and Chemometric Analyses
- Solid State Laser Technologies
- Phytochemistry and Biological Activities
- Remote Sensing and Land Use
- Silicon Nanostructures and Photoluminescence
- Traditional Chinese Medicine Studies
- Land Use and Ecosystem Services
- Environmental Changes in China
- Astrophysical Phenomena and Observations
- Laser-Matter Interactions and Applications
Tsinghua University
2014-2024
Chengdu University of Traditional Chinese Medicine
2014-2016
Beijing University of Posts and Telecommunications
2013-2014
State Key Laboratory of Information Photonics and Optical Communications
2014
China Jiliang University
2007-2009
We report ALMA and ACA observations of atomic carbon ([\ion{C}{1}]$(1-0)$) dust continuum in 10 Enormous Ly$\alpha$ Nebulae hosting ultra-luminous Type-I QSOs at $z=2.2-2.5$, as part the SUrvey Protocluster ELANe Revealing CO/CI Detected CGM (SUPERCOLD-CGM). detect [\ion{C}{1}]$(1-0)$ all ten five companion galaxies. find that companions have higher gas densities more intense radiation fields than Luminous Infrared galaxies high-$z$ main sequence galaxies, with highest values found QSOs. By...
The link between the circum-galactic medium (CGM) and stellar growth of massive galaxies at high-$z$ depends on properties widespread cold molecular gas. As part SUPERCOLD-CGM survey (Survey Protocluster ELANe Revealing CO/\ci\ in Ly$\alpha$-Detected CGM), we present radio-loud QSO Q1228+3128 $z=2.2218$, which is embedded an enormous Ly$\alpha$ nebula. ALMA+ACA observations CO(4-3) reveal both a outflow, more extended gas reservoir across $\sim$100 kpc CGM each containing mass M$_{\rm...
In this paper, an improved multi-carrier generation scheme based on single-side-band recirculating frequency shifter with optical finite impulse response (FIR) filter for amplified spontaneous emission (ASE) noise suppression is proposed and experimentally demonstrated. The carrier-to-noise-ratio (CNR) instead of tone-to-noise-ratio (TNR) introduced to more reasonably exactly evaluate the signal-to-noise-ratio a source non-flat floor. We have attain worst case CNR 22.5dB 19.1dB generated 50...
Abstract To understand how massive galaxies at high z coevolve with enormous reservoirs of halo gas, it is essential to study the coldest phase circumgalactic medium (CGM), which directly relates stellar growth. The SUPERCOLD-CGM survey first statistical cold molecular gas on CGM scales. We present Atacama Large Millimeter Array and Compact observations CO(4–3) continuum emission from 10 Ly α nebulae (ELANe) around ultraluminous type I quasi-stellar objects (QSOs) ∼ 2. detect in 100% our...
A comprehensive investigation is done on a high-quality frequency comb or multicarrier generation using single-sideband modulation based recirculating shifter (SSB-RFS), which has shown good capability to provide large number of frequency-locked carriers for terabits transmission. The dominant factors, such as I/Q modulator, direct current-bias, radio-frequency signal, and band pass filter, are analyzed theoretically experimentally in terms the metrics flatness, signal-to-noise ratio,...
Abstract We present continuum observations from the Atacama Large Millimeter/submillimeter Array of 10 high-redshift (2.2 ≤ z 2.7) ultraluminous quasars (QSOs) and constrain presence hot, ionized, circumgalactic gas in a stacking analysis. measure Compton- y parameter profile with peak value (1.7 ± 1.1) × −6 at radius ∼50 kpc. compare our stacked to active galactic nucleus feedback wind models generalized Navarro–Frenk–White pressure luminosity halo mass QSOs. Our observed average M 500 <...
In order to observe the spectroscopic characteristics of metallic ion in soil terahertz region, time-domain spectroscopy (THz-TDS) was used analyze absorption coefficient and refractive index frequency range 0.2 ~1.6 THz at room temperature. present work, we designed several kinds samples (i.e. different content copper sulphate zinc soil).The spectra were measured. The experimental results indicate that has many distinct characteristic between 1.6THz. This study can not only assign sample,...
Armand clematis stem (Clematidis Armandii Caulis, Chuanmutong) is a widely used Chinese herb to disinhibit urine and relieve stranguria. It difficult be identified owing its various macroscopic feature unknown characteristic compounds. Thus, total of 24 Chuanmutong samples 7 related herbs including four manshurian aristolochia (Aristolochiae Manshuriensis Guanmutong) three akebia (Akebiae Mutong) were collected analyzed in the range 4 000 - 400 cm⁻¹ by Fourier Transform Infrared (FTIR)...
The absorption spectra of rice bran oil in the frequency range 0.2~1.6THz has been measured with terahertz timedomain spectroscopy (THz-TDS) at room temperature nitrogen atmosphere. It is found that hexadecanoidc acid and octadecanoic contained spectral response to waves this region. Simultaneously, corresponding theoretical were given by using DFT methods aid Gaussian03. experimental are well comparable calculated these results mutually validated both approaches. was peaks two molecules...
Abstract We report Atacama Large Millimeter/submillimeter Array and Compact observations of atomic carbon ([C i ](1–0)) dust continuum in 10 enormous Ly α nebulae hosting ultraluminous Type-I QSOs at z = 2.2–2.5, as part the Survey Protocluster ELANe Revealing CO/C Detected CGM. detect [C ](1–0) all five companion galaxies. find that companions have higher gas densities more intense radiation fields than Luminous Infrared galaxies high- main sequence galaxies, with highest values found QSOs....
Over the past ten years, electromagnetic terahertz (THz) frequencies region from 100 GHz to 10 THz (or wavelengths of 30 μm ~3 mm) have received extensive attention and investigation. Terahertz wave detection enables direct calculations both imaginary real parts refractive index without using Kramers-Kronig relations. There are many potential applications such as radio astronomy, atmospheric studies, remote sensing, plasma diagnostics. Shoes, neckties sofa, etc mainly made skin animal,...
Rayleigh scattering loss of photonic crystal fiber is numerically analyzed by using a full-vector finite element method. The constant tangential/linear normal vector basis functions are employed to investigate the effect structure. Numerical results show that great dependence on structure parameters. PCF can be effectively reduced improving fabrication techniques.
A new method for bend loss in a curved polymer/SiON waveguide is presented and it used to design novel variable optical attenuator. The device principle based on influencing the by changing lateral refractive index contrast defining guide. beam propagation employed numerical simulation. designed attenuator has maximum attenuation of -46.1 dB. response time was below 5 ms.
Many materials were previously studied using far-infrared Fourier transform spectroscopy (FTS) in transmission and reflection modes. Recently, there has been a remarkable effort employing terahertz time-domain (THz-TDS) for investigating material properties, including environment pollutants, semiconductors, polymers, explosive materials, gases, etc. Since the absorption coefficient refractive index of are directly related to amplitude phase respectively transmitted field, both parts complex...
We have measured the absorption spectrum of three kind resistivity p-type silicons by backward-wave oscillator (BWO).The is examined and analyzed least square method. The refractive index, coefficient, dielectric functions various are obtained in frequency range extending from 0.23 THz to 0.375 THz. experimental results indicate that coefficient decreased with increase its equals 3.87x10<sup>-4</sup> cm<sup>-1</sup>. Our demonstrate applicability spectroscopy silicon characteristic analysis...
In this paper, we have proposed a novel compact sub-terahertz wave modulator based on silicon photonic crystals. our structure, the crystals are made up of p-i-n silicon. As free carriers injected, band gap shifts. The light modulation mechanism is dynamic shift (PBG). finite-difference time-domain (FDTD) method used to investigate performances designed modulator. simulation results show with high extinction ratio (-40 dB), low insertion loss (-1dB), rapid response time, and small size can...
A low noise multi-carrier generation scheme using optical FIR filter for ASE suppressing is proposed. 50 and 69 carriers are generated experimentally, having much higher carrier-to-noise-ratio values of 22.5dB 19.1dB.
The laser linewidth influence on tone-to-noise ratio (TNR) and flatness of optical comb generated by recirculating frequency shifter(RFS) are theoretical analyzed experimental demonstrated. results show performance will improve using narrower linewidth.
The laser linewidth influence on tone-to-noise ratio (TNR) and flatness of optical comb generated by recirculating frequency shifter(RFS) are theoretical analyzed experimental demonstrated. results show performance will improve using narrower linewidth.
To understand how massive galaxies at high-$z$ co-evolve with enormous reservoirs of halo gas, it is essential to study the coldest phase circum-galactic medium (CGM), which directly relates stellar growth. The SUPERCOLD-CGM survey first statistical cold molecular gas on CGM scales. We present ALMA+ACA observations CO(4-3) and continuum emission from 10 Enormous Ly$α$ Nebula (ELANe) around ultraluminous type-I QSOs $z\sim2$. detect in 100$\%$ our targets, 60$\%$ showing extended CO scales...
We present continuum observations from the Atacama Large Millimeter/submillimeter Array (ALMA) of 10 high-redshift ($2.2 \le z 2.7$) ultraluminous quasars (QSOs) and constrain presence hot, ionized, circum-galactic gas in a stacking analysis. measure Compton-y parameter profile with peak value $(1.7 \pm 1.1) \times 10^{-6}$ at radius $\sim50$ kpc. compare our stacked to active galactic nucleus (AGN) feedback wind models generalized Navarro-Frenk-White (gNFW) pressure luminosity halo mass...
By using terahertz time domain spectroscopy (THz-TDS) system, the dielectric properties of various gallium arsenides were tested in frequency range extending from 0.2 to 1.5 THz. The power absorption coefficient and refractive index resistivity measured compared. high ultra-high GaAs are equal be 6.53 5.9, respectively. variation was less than 1%, ranging 1.5THz, but showed very different frequency-dependent behaviors, 0.02cm-1 2.21cm-1, within investigated range. results show that will a...