Femtosecond Laser One-Step Microfabrication of Optical Fiber Inline Square Resonators for Chemical Sensing

2007 ◽  
Author(s):  
Yukun Han ◽  
Songping Wu ◽  
Bala P. B. Chitturi ◽  
Hai-Lung Tsai ◽  
Tao Wei ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Chemical Etching ◽  
Three Dimensional ◽  
Q Factor ◽  
Sensing Applications ◽  
Post Annealing ◽  
Fs Laser ◽  
One Step ◽  
Silica Optical Fiber ◽  
First Time

We report, for the first time, the effort to one-step micromachine an optical fiber inline square resonator by femtosecond (fs) laser ablations. Such an inline square resonator is intended for infield chemical and biological sensing applications. Our preliminary data shows the feasibility of directly machining three dimensional microstructures on a silica optical fiber with a diameter of 125μm. The observed low quality (Q) factor can be further improved by post annealing and chemical etching processes that smooth the surface roughness.

One-Step Fabrication and Functionalization of Nanostructured Silicon Surfaces for Advanced Sensing Applications

2020 ◽  
Vol 312 ◽  
pp. 154-159
Author(s):  
Alexander Yuryevich Mironenko ◽  
Mikhail Tutov ◽  
Alexander Konstantinovich Chepak ◽  
Eugeny Mitsai ◽  
Alexander A. Sergeev ◽  
...  
Keyword(s):  
Laser Processing ◽  
Laser Energy ◽  
High Spatial Frequency ◽  
Laser Pulses ◽  
Successful Implementation ◽  
Experimental Conditions ◽  
Sensing Applications ◽  
Direct Laser ◽  
Fs Laser ◽  
One Step

Direct laser processing of various materials with nano- and femtosecond (fs) laser pulses is known to be a facile and inexpensive technology for fabrication of various surface morphologies. Since ultrafast deposition of the laser energy to target material typically creates unique experimental conditions with extremely high pressure and temperature, we hypothesized that carrying out this process in anhydrous non-oxidizing environment containing functionalizing agent (fluorophore with vinyl functional group) will allow one-step fabrication and subsequent functionalization of the surface of high-n material. In this paper, we demonstrate successful implementation of this idea by fabricating high-spatial-frequency laser-induced periodic surface structures (LIPSS) via direct fs-pulse ablation of bulk crystalline Si wafer immersed in solution of N-vinylcarbazole in toluene. Laser processing with linearly polarized fs-laser pulses was found to produce LIPSS with a characteristic period around 100 nm functionalized with N-vinylcarbazole molecules via photo-activated hydrosililation reaction. The unique LIPSS with hierarchical roughness and remarkable light trapping performance functionalized with sensory fluorophore show high sensitivity due to implementation of surface enhanced fluorescence effect. By using N-vinylcarbazole as functionalizing agent we demonstrate one-step fabrication of high-performance sensor for detecting nitrobenzene in water with a detection limit of 40 nM.

Fabrication of an Atomic Resolution Low Cost STM-SNOM Hybrid Probe

2006 ◽  
Vol 6 (1) ◽  
pp. 72-76
Author(s):  
Ruggero Micheletto ◽  
Masatoshi Yokokawa ◽  
Satoshi Okazakaki ◽  
Yoichi Kawakami
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Chemical Etching ◽  
Low Cost ◽  
Resolving Power ◽  
Atomic Resolution ◽  
Hybrid Fiber ◽  
Horizontal Scale ◽  
Simple Method ◽  
One Step

We derived a simple method to fabricate STM-SNOM hybrid probes obtained from commercial cheap communication optical fibers. The tips are fabricated by a methodology that combines two well-known techniques: the selective attack by a buffered solution and the protected layer chemical etching, in a single new one-step technique. The tailored probes are then sputtered by metal and mounted on a STM setup. The usual difficulties of integrating the optical fiber in the STM head are solved originally with a particular home made mount described in details. We will show that the resulting probes reach atomic resolution on both vertical and horizontal scale, and that the optical imaging is free of artifacts and satisfactory with a lateral resolution in the order of λ/20, as far as we know the finest resolution obtained with a system based on a hybrid fiber probe. We believe that our methodology is very interesting for its simplicity of realization and for the good resolving power in both SNOM and STM modes.

Study of Coating Mechanism of Non-Binding Metals Over Silica Fibers

1998 ◽  
Vol 531 ◽  
Author(s):  
H. S. Seo ◽  
U. C. Paek ◽  
K. Oh ◽  
C. R. Kurkjian
Keyword(s):  
Optical Fiber ◽  
Numerical Method ◽  
Three Dimensional ◽  
Conduction Model ◽  
Silica Fibers ◽  
Silica Optical Fiber

AbstractThe mechanism of the coating of molten tin on a silica optical fiber is analyzed by a numerical method based on a three-dimensional conduction model.

A facile novel preparation of three-dimensional Ni@graphene by catalyzed glucose blowing for high-performance supercapacitor electrodes

RSC Advances ◽  
2015 ◽  
Vol 5 (91) ◽  
pp. 74463-74466 ◽  
Author(s):  
Lizhong Liu ◽  
Huanli Wang ◽  
Zhengwei Zhou ◽  
Guangyu He ◽  
Xiaoqiang Sun ◽  
...  
Keyword(s):  
Low Temperature ◽  
High Performance ◽  
Three Dimensional ◽  
One Step ◽  
Calcination Method ◽  
First Time

Three-dimensional Ni@graphene with high-electrochemical activities was prepared for the first time at a low temperature by a one-step calcination method.

Bioadhesive anisotropic nanogrooved microfibers directing three-dimensional neurite extension

2019 ◽  
Vol 7 (5) ◽  
pp. 2165-2173 ◽  
Author(s):  
Yilin Chen ◽  
Mehmet Berat Taskin ◽  
Zhongyang Zhang ◽  
Yingchun Su ◽  
Xiaojun Han ◽  
...  
Keyword(s):  
Three Dimensional ◽  
3D Scaffold ◽  
Neurite Extension ◽  
Neural Culture ◽  
One Step ◽  
First Time

A longitudinal nanogrooved microfiber as an anisotropic 3D scaffold together with simultaneous adhesive pNE coating was, for the first time, achieved in one step using wet-electrospinning for 3D neural culture.

Fabrication of Optical Microlenses in Glass Using a Femtosecond Laser for LBA-on-a-Chip Applications

2006 ◽  
Author(s):  
Y. Cheng ◽  
H. L. Tsai
Keyword(s):  
Femtosecond Laser ◽  
Laser Beam ◽  
Chemical Etching ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Lab On A Chip ◽  
Selective Removal ◽  
Curved Surfaces ◽  
Photosensitive Glass ◽  
Fs Laser

We describe the fabrication of microoptical cylindrical and hemispherical lenses vertically embedded in a photosensitive Foturan glass by femtosecond (fs) laser three-dimensional (3D) micromachining. The process is mainly composed of four steps: (1) fs laser scanning in the photosensitive glass to form curved surfaces (spherical and/or cylindrical); (2) postannealing of the sample for modification of the exposed areas; (3) chemical etching of the sample for selective removal of the modified areas; and (4) second postannealing for smoothening the surfaces of the tiny lenses. We examine the focusing ability of the microoptical lenses using a He-Ne laser beam, showing great potential of using these microoptical lenses in lab-on-a-chip applications.

scholarly journals Rapid Growth of TiO2 Nanoflowers via Low-Temperature Solution Process: Photovoltaic and Sensing Applications

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 566 ◽  
Author(s):  
M. Akhtar ◽  
Ahmad Umar ◽  
Swati Sood ◽  
InSung Jung ◽  
H. Hegazy ◽  
...  
Keyword(s):  
Low Temperature ◽  
Anatase Phase ◽  
Three Dimensional ◽  
Solution Process ◽  
Dye Sensitized Solar Cell ◽  
Sensor Applications ◽  
Dye Sensitized ◽  
Sensing Applications ◽  
Density Growth ◽  
Temperature Solution

This paper reports the rapid synthesis, characterization, and photovoltaic and sensing applications of TiO2 nanoflowers prepared by a facile low-temperature solution process. The morphological characterizations clearly reveal the high-density growth of a three-dimensional flower-shaped structure composed of small petal-like rods. The detailed properties confirmed that the synthesized nanoflowers exhibited high crystallinity with anatase phase and possessed an energy bandgap of 3.2 eV. The synthesized TiO2 nanoflowers were utilized as photo-anode and electron-mediating materials to fabricate dye-sensitized solar cell (DSSC) and liquid nitroaniline sensor applications. The fabricated DSSC demonstrated a moderate conversion efficiency of ~3.64% with a maximum incident photon to current efficiency (IPCE) of ~41% at 540 nm. The fabricated liquid nitroaniline sensor demonstrated a good sensitivity of ~268.9 μA mM−1 cm−2 with a low detection limit of 1.05 mM in a short response time of 10 s.

Controllable Electrochemical Synthesis of Ag Hierarchical Micro/Nanostructures with High SERS-Activity

NANO ◽  
2020 ◽  
Vol 15 (04) ◽  
pp. 2050043
Author(s):  
Huayu Zhou ◽  
Jingjing Wang ◽  
Qiong Yang ◽  
Menglei Chen ◽  
Changsheng Song ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Current System ◽  
Three Dimensional ◽  
Constant Current ◽  
Localized Surface Plasmon ◽  
Excitation Wavelength ◽  
Raman Signal ◽  
Mixed Solution ◽  
Raman Enhancement ◽  
One Step

We report a one-step electrochemical deposition technique to prepare three-dimensional (3D) Ag hierarchical micro/nanostructured film consisting of well-crystallized Ag nanosheets grown on an indium tin oxide (ITO) conductive substrate. The Ag hierarchical micro/nanostructures were fabricated in the mixed solution of AgNO3 and sodium citrate in a constant current system at room temperature. Through reduction of Ag[Formula: see text] electrodeposited on the surface of ITO substrate, nanoparticles were grown to form nanosheets which further combined into 3D sphere-like microstructures. The 3D Ag micro/nanostructures have many sharp edges and nanoscale gaps which can give rise to good Raman-enhanced effect. Due to localized surface plasmon resonance (LSPR) effects, these special Ag micro/nanostructures exhibited good Raman-enhanced performance. Using Rhodamine 6G (R6G) molecules as probe molecule, we studied the influence of excitation wavelength on Raman enhancement. The results showed that the 532[Formula: see text]nm excitation wavelength is the best to obtain the strongest Raman signal and to reduce the influence of other impurity peaks. Using the as-synthesized Ag hierarchical micro/nanostructures, we can detect the 10[Formula: see text][Formula: see text]mol/L R6G aqueous solution, exhibiting great Raman-enhanced effect.

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