Laser Trapping Using a Fiber Axicon Microlens

2012 ◽  
Vol 516 ◽  
pp. 580-584 ◽  
Author(s):  
Kozo Taguchi ◽  
Shinya Imanaka
Keyword(s):  
Chemical Etching ◽  
Single Mode ◽  
Apex Angle ◽  
Physical Contact ◽  
Optical Forces ◽  
Laser Trapping ◽  
Etching Technique ◽  
Cell Trapping ◽  
Promising Tool ◽  
Selective Chemical

In this paper, chemically etched axicon fibre was proposed for laser trapping of micro-objects dispersed in liquid. We fabricated axicon microlenses on a single-mode bare optical fibre using a selective chemical etching technique. The laser beam from a fibre axicon microlens was strongly focused and optical forces were sufficient to move microorganisms and biological cells without physical contact. From the experimental results, it was found that our proposed fibre axicon microlens is a promising tool for cell trapping and the apex angle of the chemically etched fibre axicon microlens is a very important parameter for laser trapping.

Two-Dimensional Cell Trapping Using Single Axicon Fiber without Physical Contact

2012 ◽  
Vol 523-524 ◽  
pp. 1070-1075 ◽  
Author(s):  
Kozo Taguchi
Keyword(s):  
Single Mode ◽  
Apex Angle ◽  
Physical Contact ◽  
Two Dimensional ◽  
Optical Forces ◽  
Etching Technique ◽  
Cell Trapping ◽  
Promising Tool ◽  
Selective Chemical ◽  
Dimensional Cell

Chemically etched axicon fiber was proposed for two-dimensional cell trapping. We fabricated axicon micro lenses on a single-mode bare optical fiber by selective chemical etching technique. The laser beam from fiber axicon microlens was strongly focused and optical forces were sufficient to move a microorganisms and biological cells without physical contact. The apex angle of the chemically etched fiber axicon microlens was very important parameter for laser trapping. From these experimental results, it was found that our proposed method was a promising tool for the isolation of microorganisms.

Experimental Investigation of Cell Cloning Efficiency after Optical Trapping

2014 ◽  
Vol 625 ◽  
pp. 695-699
Author(s):  
Kozo Taguchi ◽  
Takuya Hayashi
Keyword(s):  
Chemical Etching ◽  
Single Mode ◽  
Laser Wavelength ◽  
Physical Contact ◽  
Light Sources ◽  
Optical Forces ◽  
Cloning Efficiency ◽  
Etching Technique ◽  
Cell Trapping ◽  
Selective Chemical

In this paper, chemically etched axicon fiber was investigated for laser trapping of micro-object dispersed in liquid. We fabricated axicon micro lenses on a single-mode bare optical fiber by selective chemical etching technique. The laser beam from fiber axicon microlens was strongly focused and optical forces were sufficient to move a microorganisms and biological cells without physical contact. In our experiments, several different lasers with various wavelengths were used as light sources. From these experimental results, it was found that laser wavelength was very important parameter for cell trapping and laser wavelength should be selected to avoid absorption by cells in order to prevent thermal degradation and damage to the cells.

scholarly journals Fabrication of Multimode-Single Mode Polymer Fiber Tweezers for Single Cell Trapping and Identification with Improved Performance

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2746 ◽  
Author(s):  
Sandra Rodrigues ◽  
Joana Paiva ◽  
Rita Ribeiro ◽  
Olivier Soppera ◽  
João Cunha ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Physical Contact ◽  
Scattered Signal ◽  
Fabrication Method ◽  
Cell Trapping ◽  
Low Degree ◽  
Single Cell Trapping ◽  
Improved Performance ◽  
Multi Mode

Optical fiber tweezers have been gaining prominence in several applications in Biology and Medicine. Due to their outstanding focusing abilities, they are able to trap and manipulate microparticles, including cells, needing any physical contact and with a low degree of invasiveness to the trapped cell. Recently, we proposed a fiber tweezer configuration based on a polymeric micro-lens on the top of a single mode fiber, obtained by a self-guided photopolymerization process. This configuration is able to both trap and identify the target through the analysis of short-term portions of the back-scattered signal. In this paper, we propose a variant of this fabrication method, capable of producing more robust fiber tips, which produce stronger trapping effects on targets by as much as two to ten fold. These novel lenses maintain the capability of distinguish the different classes of trapped particles based on the back-scattered signal. This novel fabrication method consists in the introduction of a multi mode fiber section on the tip of a single mode (SM) fiber. A detailed description of how relevant fabrication parameters such as the length of the multi mode section and the photopolymerization laser power can be tuned for different purposes (e.g., microparticles trapping only, simultaneous trapping and sensing) is also provided, based on both experimental and theoretical evidences.

Optical Waveguides In BenzoCyclobutene (BCB 4024–40) Polymer

2012 ◽  
Author(s):  
Mohd Haniff Ibrahim ◽  
Norazan Mohd Kassim ◽  
Abu Bakar Mohammad ◽  
Mee–Koy Chin ◽  
Shuh–Ying Lee
Keyword(s):  
Spin Coating ◽  
Optical Waveguides ◽  
Chemical Etching ◽  
Single Mode ◽  
Etching Technique ◽  
Waveguide Loss ◽  
Bk7 Glass ◽  
Average Loss ◽  
Fabrication And Characterization ◽  
Prism Coupling

Proses fabrikasi dan pencirian bagi pandu gelombang optik mod tunggal yang berdasarkan bahan polimer sensitif cahaya, BenzoCyclobutene (BCB 4024–40) dibincangkan. Ketebalan filem polimer bagi pelbagai kelajuan putaran enapan dan indeks biasan polimer diukur menggunakan kaedah prisma gandingan. Pandu gelombang ini difabrikasi menggunakan kaedah fotolitografi dan punaran kimia basah di atas bahan kaca BK7 dan lapisan nipis SiO2 sebagai pelindung. Kehilangan pandu gelombang diukur menggunakan kaedah konvensional ‘cut back’ yang menghasilkan purata kehilangan sebanyak 3.5 dB/cm. Kata kunci: Polimer BenzoCyclobutene; kaedah putaran enapan; kaedah punaran kimia basah; prisma gandingan The fabrication and characterization processes of single mode optical waveguide based on photosensitive BenzoCyclobutene (BCB 4024–40) polymer are described. The polymer film thickness for various coating speed and refractive index are measured by the method of prism coupling. The waveguide is fabricated using the photolithography and chemical etching technique on BK7 glass substrate with a thin layer of SiO2 as cover. The waveguide loss is measured using the conventional cut back method which results on an average loss of 3.5 dB/cm. Key words: BenzoCyclobutene polymer; spin coating technique; chemical etching technique; prism coupling; cutback method

Mapping two-dimensional arsenic distributions in silicon using dopant-selective chemical etching technique

1997 ◽  
Vol 82 (11) ◽  
pp. 5811-5815 ◽  
Author(s):  
Suneeta S. Neogi ◽  
David Venables ◽  
Zhiyong Ma ◽  
Dennis M. Maher ◽  
Mitchell Taylor ◽  
...  
Keyword(s):  
Chemical Etching ◽  
Two Dimensional ◽  
Etching Technique ◽  
Selective Chemical ◽  
Selective Chemical Etching

scholarly journals Three-Dimensional Residue-Free Volume Removal inside Sapphire by High-Temperature Etching aftercmd="newline" Irradiation of Femtosecond Laser Pulses

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Shigeki Matsuo ◽  
Kensuke Tokumi ◽  
Takuro Tomita ◽  
Shuichi Hashimoto
Keyword(s):  
High Temperature ◽  
Femtosecond Laser ◽  
Chemical Etching ◽  
Room Temperature ◽  
Three Dimensional ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Etching Technique ◽  
Selective Chemical ◽  
Selective Chemical Etching

We applied the femtosecond laser-assisted etching technique, that is, irradiation of focused femtosecond laser pulses followed by selective chemical etching, to volume removal inside sapphire. At room temperature, volume etching only slightly advanced while residue remained inside the volume. By increasing the etching temperature, complete volume etching without residue was achieved. Complete etching was, however, accompanied by undesirable phenomena of surface pits or cracks, which are expected to be excluded through further improvement of processing.

Controllable end shape modification of ZnO nano-arrays/rods by a simple wet chemical etching technique

2015 ◽  
Vol 48 (36) ◽  
pp. 365303 ◽  
Author(s):  
Jingchang Sun ◽  
Ting Zhao ◽  
Zhangwei Ma ◽  
Ming Li ◽  
Cheng Chang ◽  
...  
Keyword(s):  
Chemical Etching ◽  
Shape Modification ◽  
Etching Technique ◽  
Wet Chemical ◽  
Wet Chemical Etching

Scaling properties of a Si surface patterned by selective chemical etching

2004 ◽  
Vol 36 (1-3) ◽  
pp. 353-358 ◽  
Author(s):  
G. Wisz ◽  
T.Ya. Gorbach ◽  
P.S. Smertenko ◽  
A. Blahut ◽  
K. Zembrowska ◽  
...  
Keyword(s):  
Chemical Etching ◽  
Scaling Properties ◽  
Selective Chemical ◽  
Selective Chemical Etching

scholarly journals The Art of Tungsten Etching in Semiconductor Chips

1999 ◽  
Vol 7 (2) ◽  
pp. 24-25
Author(s):  
Lisa Litz-Montanaro
Keyword(s):  
Manufacturing Process ◽  
Chemical Etching ◽  
Layer By Layer ◽  
Ion Milling ◽  
Etching Technique ◽  
Semiconductor Structures ◽  
Wet Chemical ◽  
Wet Chemical Etching ◽  
Semiconductor Chips ◽  
Complex Semiconductor

In the course of both physical and failure analysis of semiconductor chips (i.e., verifying what you actually deposited as a layer, vs, what caused the circuit to fail), it is essential to have appropriate deprocessing tools at your disposal in order to evaluate complex semiconductor structures, Deprocessing techniques are developed for each product manufactured and involve multi-step procedures that reveal the layer-by-layer secrets of the chip, These techniques require constant tweaking in duration and procedure as the manufacturing process imposes changes and as the architecture of the semiconductor changes. While there are many tools that assist in these analytical pursuits, such as RIE (reactive ion etching - a dry etching technique), ion milling, and microcleaving, the wet chemical etching of tungsten is sometimes more reproducible than RIE techniques.

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