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In situ and remote detection of chemical product is experimentally demonstrated using a continuous-terahertz (THz) wave sensing/imaging system with a Teflon pipe as a scanning arm. Based on THz-refractive-index-sensitive reflection and fast response of electronic THz detector, the reflective THz sensing system can be used to real-time trace and quantitatively analyze the ammonium-chloride aerosols...
Microporous polymer structures (MPSs) based on multi-layered plastic meshes are experimentally approved for label-free volatile gas sensing with high sensitivity and reasonable selectivity in terahertz frequency region. Various MPS gas sensors with different micropore sizes and stacking configurations are prepared for investigation of the geometry dependent sensitivity. Identification of different...
Metal rod array (MRA) are presented as the microstructured cladding of a rectangle channel waveguide to guide terahertz (THz) waves. The microstructure cladding is critical to modify the waveguide loss, dispersion, resonance, and pass-band. THz-field resonance and the corresponding modal field are taken as examples to express that the MRA period can be tailored for engineering the waveguide. MRA is...
Terahertz waves bound inside a metallic rod-array is successfully demonstrated and used to sense ultra-thin molecular layers in the presentation. From the transmitted surface waves with constructive interference, nanometer-thick films of SiO2 and ZnO are successfully identified, corresponding to λ/1923 and superior to the available THz sensors.
A simple multilayer micro-porous structure has been successfully demonstrated for identifying different types and concentrations of vapor molecules. The measured minimum concentration is achieved 9 ppm, corresponding to molecular density variation of 0.16 nano-mole/mm3.
Subwavelength confined terahertz waves propagating along a planar waveguide is successfully demonstrated via the integration between a diffraction metal grating and a plastic ribbon. The longest propagation distance and minimum confined range are, respectively, 50mm and λ/5, improving the deliverable range of spoof-surface-plasmon-polaritons.
A plastic ribbon integrated with one-dimensional-metal grating is first demonstrated as a hybrid-plasmonic waveguide to highly confine terahertz radiation approaching to power range of λ/26 and the longest propagation distance is experimentally up to 50mm.
A terahertz endoscope utilizing a single plastic hollow-tube with low bending loss is demonstrated to identify molecular concentration and map out object surface-altitudes. The measurements are well consistent with the calculated results.
A continuously tunable terahertz notch filter is demonstrated by using antiresonant reflecting hollow waveguides. The maximum frequency-tuning-range approached 50% of the bandwidth, and a 20dB notch-depth with a linewidth of 6GHz was successfully achieved.
A highly sensitive detection method based on the evanescent wave of a terahertz subwavelength plastic wire was demonstrated for liquid sensing. A 20ppm melamine alcohol solution is successfully identified with refractive-index sensitivity of 0.01.
A hollow-core anti-resonant reflecting terahertz waveguide is first demonstrated for refractive index sensing. Various dangerous vapors and micro-molecular-layer with 1%-concentration variation (corresponds to 0.01-index-variation) have been successfully identified. The sensitivity could reach up to 7.17×105nm/RIU.
We proved the existence of resonant-enhanced dipolar interaction between THz-photons and confined acoustic phonons in nanocrystals. By a specific core-shell charge separation, the dipolar (l=1) confined acoustic modes was activated to absorb THz waves.
We demonstrate a continuous-wave THz fiber-endoscopy by utilizing low-loss THz subwavelength plastic fibers. The reconstructed 3D images not only reflect the depth variation of the object surface, but also reveal the molecular distribution of samples.
We proved the existence of resonant-enhanced dipolar interaction between THz-photons and confined acoustic phonons in nanocrystals. By a specific core-shell charge separation, the dipolar (l=1) confined acoustic modes was activated to absorb THz waves.
We demonstrate a continuous-wave THz fiber-endoscopy by utilizing low-loss THz subwavelength plastic fibers. The reconstructed 3D images not only reflect the depth variation of the object surface, but also reveal the molecular distribution of samples.
From the spectral loss characteristics of subwavelength-diameter THz fibers, our study supports the recent theory proposed by M. Sumetsky that diameter-variation-induced-radiation is a dominant loss mechanism for subwavelength fibers which limits the lowest guidable frequency.
We demonstrated a THz subwavelength fiber coupler for future millimeter wave applications. Unlike traditional optical fiber couplers, its coupling ratio is independent of the length of the coupling region because of the anti-symmetric mode cutoff.
We demonstrate a simple and low-loss THz microstructure fiber for broadband THz waveguiding, which is constructed by using the highly flexible and readily available materials. Substantially low attenuation constant less than 0.01 cm-1 has been achieved.
From the spectral loss characteristics of subwavelength-diameter THz fibers, our study supports the recent theory proposed by M. Sumetsky that diameter-variation-induced-radiation is a dominant loss mechanism for subwavelength fibers which limits the lowest guidable frequency.
We demonstrate a THz-biochip integrated with a compact high-efficiency micro-THz source with tunable THz frequencies for direct, sensitive, localized label-free bio-sensing. The capability to identity different illicit drug powders is successfully demonstrated.
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