scholarly journals Stable organic self-assembled microwire lasers for chemical vapor sensing

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Zheming Chen ◽  
Chenghu Dai ◽  
Wei Xiong ◽  
Yanke Che ◽  
Chuang Zhang
Keyword(s):  
Self Assembly ◽  
Sensor Arrays ◽  
Optical Gain ◽  
Chemical Vapor ◽  
High Sensitivity ◽  
Excitation Power ◽  
Stimulated Emission ◽  
Vapor Detection ◽  
Vapor Sensing ◽  
Improved Stability

AbstractOrganic microlasers hold great potentials in fabricating on-chip sensors for integrated photonic circuits due to their chemical versatility and reactivity. However, chemical vapor detection is still challenging for organic microlaser sensors, as it requires not only optical gain and self-assembly capability, but also rapid response to stimuli and long-term stability under high excitation power. In this work, a new laser dye 4,7-bis(9-octyl-7-(4-(octyloxy)phenyl)-9H-carbazol-2-yl)benzo[c][1,2,5]thiadiazole (BPCBT) is designed and synthesized, which self-assembles into microwires showing strong intramolecular charge transfer (ICT) photoluminescence with >80% quantum efficiency. It enables the lasing from BPCBT microwires under a low threshold of 16 μJ·mm−2·pulse−1 with significantly improved stability over conventional organic microlasers. The stimulated emission amplifies the fluorescence change in the BPCBT microwires under chemical vapors including various acid, acetone, and ethanol vapors, indicating high sensitivity and high selectivity of organic microlaser sensors desirable for compact sensor arrays in integrated photonics.

Erbium-Doped Barium Titanate Thin Film Waveguides For Integrated Optical Amplifiers

2001 ◽  
Vol 694 ◽  
Author(s):  
Andrew R. Teren ◽  
Seong-Soo Kim ◽  
Seng-Tiong Ho ◽  
Bruce W. Wessels
Keyword(s):  
Thin Film ◽  
Optical Gain ◽  
Chemical Vapor ◽  
Stimulated Emission ◽  
Organic Chemical ◽  
Factors Affecting ◽  
Luminescence Efficiency ◽  
Metal Organic ◽  
Thin Film Waveguides ◽  
Er Doped

AbstractThe factors affecting optical gain were studied for Er-doped BaTiO3 thin film waveguides. Er-doped BaTiO3 with dopant concentrations of 0.3 – 9 at.% was deposited by metal-organic chemical vapor deposition. The luminescence efficiency was maximized by optimizing the growth temperatureand erbium concentration as well as by post-deposition annealing. Stimulated emission was studied using the pump-probe technique over the spectral range of 1,520-1,550 nm. A maximum differential gain of 3 dB/cm wasmeasured at 1,540 nm in an 8 mm long, 8 μm wide ridge waveguide.

Erbium-Doped Barium Titanate Thin FilmWaveguides For Integrated Optical Amplifiers

2001 ◽  
Vol 688 ◽  
Author(s):  
Andrew R. Teren ◽  
Seong-Soo Kim ◽  
Seng-Tiong Ho ◽  
Bruce W. Wessels
Keyword(s):  
Optical Gain ◽  
Chemical Vapor ◽  
Stimulated Emission ◽  
Organic Chemical ◽  
Pump Probe ◽  
Factors Affecting ◽  
Luminescence Efficiency ◽  
Metal Organic ◽  
Thin Film Waveguides ◽  
Er Doped

AbstractThe factors affecting optical gain were studied for Er-doped BaTiO3 thin film waveguides. Er-doped BaTiO3 with dopant concentrations of 0.3 – 9 at.% was deposited by metal-organic chemical vapor deposition. The luminescence efficiency was maximized by optimizing the growth temperature and erbium concentration as well as by post-deposition annealing. Stimulated emission was studied using the pump-probe technique over the spectral range of 1,520-1,550 nm. A maximum differential gain of 3 dB/cm was measured at 1,540 nm in an 8 mm long, 8 μm wide ridge waveguide.

scholarly journals Super-resolution vibrational microscopy by stimulated Raman excited fluorescence

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Hanqing Xiong ◽  
Naixin Qian ◽  
Yupeng Miao ◽  
Zhilun Zhao ◽  
Chen Chen ◽  
...  
Keyword(s):  
Laser Excitation ◽  
Signal To Noise Ratio ◽  
Resolution Enhancement ◽  
Super Resolution ◽  
High Sensitivity ◽  
Excitation Power ◽  
Stimulated Emission ◽  
Imaging Method ◽  
High Contrast ◽  
Stimulated Raman

AbstractInspired by the revolutionary impact of super-resolution fluorescence microscopy, super-resolution Raman imaging has been long pursued because of its much higher chemical specificity than the fluorescence counterpart. However, vibrational contrasts are intrinsically less sensitive compared with fluorescence, resulting in only mild resolution enhancement beyond the diffraction limit even with strong laser excitation power. As such, it is still a great challenge to achieve biocompatible super-resolution vibrational imaging in the optical far-field. In 2019 Stimulated Raman Excited Fluorescence (SREF) was discovered as an ultrasensitive vibrational spectroscopy that combines the high chemical specificity of Raman scattering and the superb sensitivity of fluorescence detection. Herein we developed a novel super-resolution vibrational imaging method by harnessing SREF as the contrast mechanism. We first identified the undesired role of anti-Stokes fluorescence background in preventing direct adoption of super-resolution fluorescence technique. We then devised a frequency-modulation (FM) strategy to remove the broadband backgrounds and achieved high-contrast SREF imaging. Assisted by newly synthesized SREF dyes, we realized multicolor FM-SREF imaging with nanometer spectral resolution. Finally, by integrating stimulated emission depletion (STED) with background-free FM-SREF, we accomplished high-contrast super-resolution vibrational imaging with STED-FM-SREF whose spatial resolution is only determined by the signal-to-noise ratio. In our proof-of-principle demonstration, more than two times of resolution improvement is achieved in biological systems with moderate laser excitation power, which shall be further refined with optimized instrumentation and imaging probes. With its super resolution, high sensitivity, vibrational contrast, and mild laser excitation power, STED-FM-SREF microscopy is envisioned to aid a wide variety of applications.

scholarly journals Photonic crystal fiber interferometer for chemical vapor detection with high sensitivity

2009 ◽  
Vol 17 (3) ◽  
pp. 1447 ◽  
Author(s):  
Joel Villatoro ◽  
Mark P. Kreuzer ◽  
Rajan Jha ◽  
Vladimir P. Minkovich ◽  
Vittoria Finazzi ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Chemical Vapor ◽  
High Sensitivity ◽  
Vapor Detection ◽  
Crystal Fiber

scholarly journals Three-Dimensional Graphene Composite Containing Graphene-SiO2 Nanoballs and Its Potential Application in Stress Sensors

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 438 ◽  
Author(s):  
Bowei Zhao ◽  
Tai Sun ◽  
Xi Zhou ◽  
Xiangzhi Liu ◽  
Xiaoxia Li ◽  
...  
Keyword(s):  
Self Assembly ◽  
High Performance ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
High Sensitivity ◽  
Measurement Range ◽  
Recoverable Strain ◽  
Assembly Method ◽  
Stress Sensors ◽  
One Step

Combining functional nanomaterials composite with three-dimensional graphene (3DG) is a promising strategy for improving the properties of stress sensors. However, it is difficult to realize stress sensors with both a wide measurement range and a high sensitivity. In this paper, graphene-SiO2 balls (GSB) were composed into 3DG in order to solve this problem. In detail, the GSB were prepared by chemical vapor deposition (CVD) method, and then were dispersed with graphene oxide (GO) solution to synthesize GSB-combined 3DG composite foam (GSBF) through one-step hydrothermal reduction self-assembly method. The prepared GSBF owes excellent mechanical (95% recoverable strain) and electrical conductivity (0.458 S/cm). Furthermore, it exhibits a broad sensing range (0–10 kPa) and ultrahigh sensitivity (0.14 kPa−1). In addition, the water droplet experiment demonstrates that GSBF is a competitive candidate of high-performance materials for stress sensors.

Few-layered α-MoTe2 Schottky junction for a high sensitivity chemical-vapour sensor

2018 ◽  
Vol 6 (40) ◽  
pp. 10714-10722 ◽  
Author(s):  
Iman Shackery ◽  
Atiye Pezeshki ◽  
Jae Young Park ◽  
Umadevi Palanivel ◽  
Hyeok Jae Kwon ◽  
...  
Keyword(s):  
Schottky Diodes ◽  
Chemical Vapour ◽  
Chemical Vapor ◽  
High Sensitivity ◽  
Schottky Junction ◽  
Excellent Performance ◽  
Vapor Sensing ◽  
In Series ◽  
Chemical Vapor Sensing ◽  
First Time

For the first time, we connect in series two α-MoTe2-based Schottky diodes (SDs) to form a back-to-back diode using the micromechanical exfoliation method. Such structure shows excellent performance toward chemical vapor sensing.

High-Sensitivity Micro-Gas Chromatograph–Photoionization Detector for Trace Vapor Detection

ACS Sensors ◽  
2021 ◽  
Author(s):  
Maxwell Wei-Hao Li ◽  
Abhishek Ghosh ◽  
Anandram Venkatasubramanian ◽  
Ruchi Sharma ◽  
Xiaolu Huang ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Gas Chromatograph ◽  
Vapor Detection ◽  
Photoionization Detector

Comparison of Chemical Vapor Sensing Properties between Graphene and Carbon Nanotubes

2012 ◽  
Vol 51 ◽  
pp. 045101 ◽  
Author(s):  
Hyung Goo Park ◽  
Sukju Hwang ◽  
Juhwan Lim ◽  
Duck-Hwan Kim ◽  
In Sang Song ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor ◽  
Sensing Properties ◽  
Vapor Sensing ◽  
Chemical Vapor Sensing

Growth of Single Crystalline ZnO Nanotubes and Nanosquids

2007 ◽  
Vol 1057 ◽  
Author(s):  
Abhishek Prasad ◽  
Samuel Mensah ◽  
Jiesheng Wang ◽  
Archana Pandey ◽  
Yoke Khin Yap
Keyword(s):  
Vapor Deposition ◽  
Self Assembly ◽  
Chemical Vapor ◽  
Zno Nanostructures ◽  
X Ray ◽  
Thermal Chemical Vapor Deposition ◽  
Crystal Growth Mechanism ◽  
Zno Nanotubes ◽  
Solid Crystal

ABSTRACTThe growth of ZnO nanotubes and nanosquids is obtained by conventional thermal chemical vapor deposition (CVD) without the use of catalysts or templates. Characterization of these ZnO nanostructures was conducted by X-ray powder diffraction (XRD), Field-emission scanning electron microscopy (FESEM), Raman spectroscopy, and photoluminescence (PL). Results indicate that these ZnO nanostructures maintain the crystalline structures of the bulk wurtzite ZnO crystals. Our results show that rapid cooling can be used to induce the formation of ZnO nanotubes and ZnO nanosquids. The self-assembly of these novel ZnO nanostructures are guided by the theory of nucleation and the vapor-solid crystal growth mechanism.

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