Boosting Light Collection Efficiency of Optical Fibers Using Metallic Nanostructures

ACS Photonics ◽  
2019 ◽  
Vol 6 (3) ◽  
pp. 691-698 ◽  
Author(s):  
Ning Wang ◽  
Matthias Zeisberger ◽  
Uwe Hübner ◽  
Markus A. Schmidt
Keyword(s):  
Optical Fibers ◽  
Collection Efficiency ◽  
Metallic Nanostructures ◽  
Light Collection

scholarly journals Influence of a Surface Finishing Method on Light Collection Behaviour of PWO Scintillator Crystals

Photonics ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 47 ◽  
Author(s):  
Daniele Rinaldi ◽  
Luigi Montalto ◽  
Michel Lebeau ◽  
Paolo Mengucci
Keyword(s):  
High Energy Physics ◽  
Collection Efficiency ◽  
Removal Rate ◽  
Light Yield ◽  
Grazing Incidence ◽  
Structural Condition ◽  
High Energy ◽  
Production Performance ◽  
Surface Finishing ◽  
Light Collection

In the field of scintillators, high scintillation and light production performance require high-quality crystals. Although the composition and structure of crystals are fundamental in this direction, their ultimate optical performance is strongly dependent on the surface finishing treatment. This paper compares two surface finishing methods in terms of the final structural condition of the surface and the relative light yield performances. The first polishing method is the conventional “Mechanical Diamond Polishing” (MDP) technique. The second polishing technique is a method applied in the electronics industry which is envisaged for finishing the surface treatment of scintillator crystals. This method, named “Chemical Mechanical Polishing” (CMP), is efficient in terms of the cost and material removal rate and is expected to produce low perturbed surface layers, with a possible improvement of the internal reflectivity and, in turn, the light collection efficiency. The two methods have been applied to a lead tungstate PbWO4 (PWO) single crystal due to the wide diffusion of this material in high energy physics (CERN, PANDA project) and diagnostic medical applications. The light yield (LY) values of both the MDP and CMP treated crystals were measured by using the facilities at CERN while their surface structure was investigated by Scanning Electron Microscopy (SEM) and Grazing Incidence X-ray Diffraction (GID). We present here the corresponding optical results and their relationship with the processing conditions and subsurface structure.

Experimental study of near-field light collection efficiency of aperture fiber probe at near-infrared wavelengths

2011 ◽  
Vol 50 (29) ◽  
pp. 5710 ◽  
Author(s):  
Nobuhiro Tsumori ◽  
Motoki Takahashi ◽  
Yoshiki Sakuma ◽  
Toshiharu Saiki
Keyword(s):  
Experimental Study ◽  
Near Infrared ◽  
Collection Efficiency ◽  
Near Field ◽  
Light Collection ◽  
Fiber Probe ◽  
Infrared Wavelengths

scholarly journals Study of Background Pulse Spectrum of an LSC System

Radiocarbon ◽  
1989 ◽  
Vol 31 (03) ◽  
pp. 342-351 ◽  
Author(s):  
Sigurđur A Einarsson ◽  
Páll Theodórsson
Keyword(s):  
Counting Rate ◽  
Liquid Scintillation ◽  
Collection Efficiency ◽  
Pulse Height ◽  
Pulse Height Spectrum ◽  
Light Collection ◽  
Background Counting Rate ◽  
Proportional Counters ◽  
Background Counting ◽  
Made In

Important advances have been made in reducing the background counting rate of gas proportional counters for14C dating through detailed and systematic study of the background components. Until recently, limited work has been reported on the study of the background of liquid scintillation counters (LSC). During the last few years, commercial systems with greatly reduced background have been introduced. It is shown that the best gas proportional counters and LSC have similar backgrounds for the same amount of sample material. Similar results with less effort may be expected with more detailed and fundamental knowledge of the components of the background of LSC. We report the results of a study of one photomultiplier LSC system where we research all parameters of importance: light collection efficiency, absorbed energy per photo-electron, pulse height spectrum and background counting rate.

In Situ Studies of Coatings on Metal Wires by FT-IR External Reflectance Spectroscopy

1987 ◽  
Vol 41 (7) ◽  
pp. 1172-1175 ◽  
Author(s):  
Gi Xue ◽  
Shi-Ying Liu ◽  
Yi Jin ◽  
Shan-Geng Jiang
Keyword(s):  
Diffuse Reflectance ◽  
Collection Efficiency ◽  
Scattered Light ◽  
Attenuated Total Reflection ◽  
Light Collection ◽  
Wire Sample ◽  
Ft Ir ◽  
Metal Wires ◽  
Ft Ir Spectroscopy

Diffuse reflectance FT-IR spectroscopy was originally developed for particulate samples dispersed in KBr powders. Now, by using ellipsoid mirrors for scattered light collection, we have taken advantage of the collection efficiency of diffuse reflectance optics and have extended their use to an in situ study of coatings on metal wires and of the broken surface of a reinforcement wire as well. The result is that spectra of coatings on wire show good overall agreement with external reflection spectra of thin films. The technique we have developed has an advantage over infrared attenuated total reflection (ATR), in that there is no optical contact problem between the wire sample and ATR crystal.

scholarly journals Combining whispering gallery mode lasers and microstructured optical fibers: limitations, applications and perspectives for in-vivo biosensing

MRS Advances ◽  
2016 ◽  
Vol 1 (33) ◽  
pp. 2309-2320
Author(s):  
Alexandre François ◽  
Tess Reynolds ◽  
Nicolas Riesen ◽  
Jonathan M. M. Hall ◽  
Matthew R. Henderson ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Single Molecule ◽  
Collection Efficiency ◽  
Clinical Diagnostics ◽  
Clinical Samples ◽  
Whispering Gallery ◽  
Microstructured Optical Fibers ◽  
Sensing Applications ◽  
Sensing Platform

ABSTRACTWhispering gallery modes (WGMs) have been widely studied over the past 20 years for various applications, including biological sensing. While the WGM-based sensing approaches reported in the literature have shown tremendous performance down to single molecule detection, at present such sensing technologies are not yet mature and still have significant practical constraints that limit their use in real-world applications. Our work has focused on developing a practical, yet effective, WGM-based sensing platform capable of being used as a dip sensor for in-vivo biosensing by combining WGM fluorescent microresonators with silica Microstructured Optical Fibers (MOFs).We recently demonstrated that a suspended core MOF with a dye-doped polymer microresonator supporting WGMs positioned onto the tip of the fiber, can be used as a dip sensor. In this architecture the resonator is anchored to one of the MOF air holes, in contact with the fiber core, enabling a significant portion of the evanescent field from the fiber to overlap with the sphere and hence excite the fluorescent WGMs. This architecture allows for remote excitation and collection of the WGMs. The fiber also permits easy manipulation of the microresonator for dip sensing applications, and hence alleviates the need for a complex microfluidic interface. More importantly, it allows for an increase in both the excitation and collection efficiency compared to free space coupling, and also improves the Q factor.In this paper we present our recent results on microstructured fiber tip WGM-based sensors and show that this sensing platform can be used in clinical diagnostics, for detecting various clinically relevant biomarkers in complex clinical samples.

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