Scio-Near IR spectroscopy

Tuesday, March 3, 2015

Abstract-Double Fano resonances in a composite metamaterial possessing tripod plasmonic resonances



Y U Lee1, E Y Choi1, E S Kim1, J H Woo1, B Kang1, J Kim1, Byung Cheol Park2, T Y Hong2, Jae Hoon Kim2 and J W Wu1
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1 Department of Physics and Quantum Metamaterials Research Center, Ewha Womans University, Seoul 120-750, Korea
2 Department of Physics, Yonsei University, Seoul 120-749, Korea 



By embedding four-rod resonators inside a double-split ring resonator superlattice, a planar composite metamaterial possessing tripod plasmonic resonances is fabricated. Double Fano resonances are observed where a common subradiant driven oscillator is coupled with two superradiant oscillators. As a classical analogue of a four-level tripod atomic system, the extinction spectrum of the composite metamaterial exhibits a coherent effect based on double Fano resonances. Transfer of the absorbed power between two orthogonal superradiant oscillators is shown to be mediated by the common subradiant oscillator.

Abstract-Neutron crystal structure analysis of stilbazolium derivatives for terahertz-wave generation



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CrystEngComm, 2015, Advance Article

DOI: 10.1039/C5CE00107B
Received 17 Jan 2015, Accepted 25 Feb 2015
First published online 03 Mar 2015



The refined crystal structure of stilbazolium derivatives was determined by neutron diffraction. The interatomic distances between the cation and the anion increased when the 4-position of the benzenesulfonate counteranion had a larger atom. The absorption coefficients of the 4-halobenzenesulfonate stilbazolium derivatives in the THz region became lower.


Graphical abstract: Neutron crystal structure analysis of stilbazolium derivatives for terahertz-wave generation

Abstract-Metamaterial-based design for a half-wavelength plate in the terahertz range



In this work, a new design aimed to perform as a half-wavelength plate in the terahertz regime is presented. The fabricated samples exhibit a phase difference of 180° at 0.73 THz between the two principal polarisations that matches with the modelling results. The experimentally determined transmittances of the two polarisations were around 61 %, which is below theoretical predictions of reaching more than 90 %. The difference between the two results is explained, and possibilities for increasing the transmittance are presented.

Scio- Near IR handheld spectrometer?


My Note: Sadly, I'm way behind the curve on learning about Scio, which is a handheld near IR spectrometer which is being marketed by an company called Consumer Physics. 
https://www.consumerphysics.com/myscio/

There is reason to be skeptical of the claims, so do your own due diligence before spending any money on this product. (The cost for the basic unit, which is not yet being shipped is $249.00).
http://www.cnet.com/news/kickstarter-science-beware-the-marketing-hype/
https://www.consumerphysics.com/myscio/order

The following information on Scio comes from Google Scio Research::
https://sites.google.com/site/scioresearch/

Introduction: What is SCiO?
SCiO is a rectangular shaped, palmed sized device that is described as “The first molecular sensor that fits in the palm of your hand” (SCiO). In other words, it’s a device that allows users to shine a light onto any object to find out what its contents are. Introduced by two Israeli scientists Drar Sharon and Damian Goldring under their co-founded business, Consumer Physics, this spectroscope is connected to a database which sends information to your smart phone to an app.
A popular and simple demonstration is using SCiO to identify the contents of an apple. The user shines it’s light one half inch away from an apple, and information retrieved by the light will be sent to the users phone to first identify that it is a fruit, and then other specific measurements (SCiO). It tells how many calories are in the apple as well as other nutrition information such as sugar or fat content per 100 grams. SCiO can also tell if there are pesticides on the apple or other desirable or undesirable substances, and can tell you the breakdown of alcohol, lotions, leather, jewels, medicine, and the levels of dehydration (Blackburn).
            This unique new invention can have a significant impact on people’s lifestyles because they can get direct and exact measurements about what they are going to consume through technological means rather than relying on the promise of a company. The purpose of this paper is to describe SCiO and its benefits, security aspects, legal aspects, and potential advancements (Last Gadget Standing SCiO).
Technical information
            SCiO works by using a micro spectrometer, more specifically a near infrared spectrometer commonly abbreviated in scientific journals as (NIRS/NIR). This instruments often seen in labs as a big bulky machine, has been reduced to the size of a letter key on a standard keyboard (SCiO). This spectrometer works by shining a near infrared light, a specifics spectrum that has the unique ability to retrieve wealth of information because is just the right frequency to measure the vibrations of molecules and certain behaviors they have when the light hits them (Workman). SCiO then receives the light reflected back from the object and breaks it down into a spectrum (SCiO). This information is sent to a cloud for analysis, formed by Consumer Physics, and then that information is sent to the app on your cell phone. The cloud that analyzes the figures is an ever-growing database, and every time a person scans a material, they are contributing to the construction of the world’s largest catalogue of materials, and in a sense helping SCiO learn (Blackburn).

Blackburn, A. (2014, May 3). SCiO molecular scanner can count your calories for you
Last Gadget Standing SCiO @ 2015International CES. (2015, January 17). Retrieved March 2,     2015, from https://www.youtube.com/watch?v=MslBJ-GWIDQ
Rashbaum, W. (2000, August 19). A Smuggling Operation with a Russian Twist. The New York
Time. Retrieved March 1, 2015, from http://www.nytimes.com/2000/08/19/nyregion/a
SCiO - Explore More! (2015, January 1). Retrieved March 2, 2015, from
Workman, J. (2014, July 1). An Introduction to Near Infrared Spectroscopy. Retrieved March 2,

Monday, March 2, 2015

Abstract-Optical characterization of the principal hydrocarbon components in natural gas using terahertz spectroscopy



Energy Fuels, Just Accepted Manuscript
DOI: 10.1021/ef5028235
Publication Date (Web): March 2, 2015
Copyright © 2015 American Chemical Society
http://pubs.acs.org/doi/abs/10.1021/ef5028235?journalCode=enfuem
A rapid technique is necessary to detect the natural gas which is a more and more significant fuel resource in modern industry. Terahertz (THz) technique was employed in this research to detect the principal hydrocarbon components of natural gas including methane, ethane and propane. Two- and three-component mixtures were measured by THz setup, respectively. The amplitude ratio and time delay deviation of THz peaks between samples and reference were calculated. Phase projection pictures were obtained between the component concentrations and the amplitude ratio as well as time deviation. The phase figures evidently reflected the concentration dependent THz response and a greatly different distribution was located in the whole phase projection area. In addition, back propagation artificial neural networks method was utilized for the quantitative determination of components concentration and total pressure, and the correlation coefficient of prediction set was proved to be 0.9859. Therefore, THz technique can satisfy the increasing need of the rapid and efficient detection in natural gas industry.