Optical micro-resonator chemical sensor

Pyayt, Anna; Zhang, Xuanqi; Luo, Jingdong; Jen, Alex K.‐Y.; Dalton, Larry R.; Chen, Antao

doi:10.1117/12.720329

Cited by 6 publications

(4 citation statements)

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“…More complex prototype devices such as high bandwidth acoustic spectrum analyzers have also been demonstrated . Indeed, many more devices and applications relevant to telecommunications, computing, and defense could be cited but lie beyond the scope of this review; however, we would like to call the reader’s attention to two application areas that have received little attention in the past but are of growing interest: (1) electro-optic sensors based on ring microresonators − and (2) terahertz technology applications. ,− Obviously, organic electro-optic materials are sensors for any phenomenon that results in a change in index of refraction and as such can be used to sense a wide range of physical and chemical phenomena. The most obvious application is the sensing of electromagnetic radiation (from dc to tens of terahertz).…”

Section: Devices and Applicationsmentioning

confidence: 99%

Electric Field Poled Organic Electro-optic Materials: State of the Art and Future Prospects

2009

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Contents 42 4. Materials Processing Methodologies 44 4.1. Electric Field Poling 44 4.1.1. Conductivity Issues; Buffer Layers 45 4.1.2. Laser-Assisted Electric Field Poling 45 4.2. Lattice Hardening and Thermal Stability 46 5. Characterization Methods 46 5.1. Methods for Characterizing Molecular First Hyperpolarizability 46 5.2. Methods for Characterizing Electro-optic Activity 48 5.3. Characterization of Poling-Induced Order: VAPRAS 49 5.4. Characterization of Photochemical Stability 49 6. Devices and Applications 50 7. Conclusions and Future Prospects 50 8. Acknowledgments 51 9. References 51

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Section: Devices and Applicationsmentioning

confidence: 99%

Electric Field Poled Organic Electro-optic Materials: State of the Art and Future Prospects

2009

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“…Highly electronegative chemicals, such nitroaromatic explosives trinitrotoluene (TNT) and dinitrotoluene (DNT), have shown strong interaction with conjugated charge transfer chromophores and thus change the optical properties of chromophore-doped polymers. This makes such polymers useful in detecting trace explosives 5 . Decomposition of chromophores through exposure to ultraviolet (UV) and energetic electron beam permanently reduces the index of refraction of the polymer.…”

Section: Introductionmentioning

confidence: 99%

“…We have discovered that some polymers containing chromophores of D-π-A structure can have strong interaction with molecules of nitroaromatic compounds such as trinitrotoluene (TNT) and dinitrotoluene (DNT) 5 . As nitroaromatic compounds represent the major group of high explosives, this new discovery can potentially have applications in homeland security, counter-terrorism, and land mine detection.…”

Section: Introductionmentioning

confidence: 99%

Poled and unpoled polymers with chromophore dopants for optical sensors

Chen

2008

Linear and Nonlinear Optics of Organic Materials VIII

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Optical properties such as index of refraction and optical absorption of many chromophore-doped polymers are sensitive to the physical and chemical environment to which the polymers are exposed. Detection sensitivity is further enhanced by optical micro-resonator structures such as waveguide micro-ring resonator and fiber Bragg gratings. Chromophore-doped polymers also offer some desirable flexibility in device fabrication. Ultraviolet light and electron beam can reduce the index of refraction of the polymer. The photobleaching and electron beam bleaching methods form optical waveguides in a single fabrication step and do not involve solvents or wet chemicals, and can be applied to polymers that are not compatible with other waveguide fabrication techniques. This Paper provides an overview of the basic principles and designs of such sensors. A chemical sensor to detect trace explosives and a broadband fiber optic electric-field sensor are presented as practical examples.

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“…There are many sensors that can work in almost real time and do not require use of reagents, but they typically measure refractive index and are based on ring-resonators [23][24][25][26], photoniccrystals [15][16][17][18][19][20][21], whispering gallery-mode [22][23][24], plasmonic structures [25] and other optical components, that without additional modifications do not provide enough specificity for differentiation between multiple drugs. In addition, these techniques are prone to noise caused by any microscale particles present in the system and are very sensitive to small temperature changes.…”

Section: Introductionmentioning

confidence: 99%

Optofluidic spectroscopy integrated on optical fiber platform

Archibong

Stewart

Pyayt

2015

Sensing and Bio-Sensing Research

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a b s t r a c t Administering a wrong drug or a wrong dose can be extremely dangerous and can result in severe adverse effects or even the death of a patient. With human errors being possible, automatic real time identification of a drug and its concentration using technology is a viable option to decrease the chance of incorrect drug administration. As a step toward this goal, we propose a new optical fiber based spectroscopic system that has built-in filtration capabilities and thus can work in real time near patient without additional sample pre-processing. It is designed as a point probe consisting of an optical fiber with a miniature filtering reflector integrated on the interface. In the future it can be inserted into a bag for intravenous therapy (IV therapy) or in a syringe to measure the spectrum of the fluid and to confirm its properties. Additionally, use of microfluidic filtration allows to remove microscopic particles from the sample and thus decreases the noise and increases the sensitivity of spectroscopic measurement. In this study, an optofluidic system was fabricated, and filtration capabilities and measurement of cobalamin (vitamin B 12 ) concentration have been demonstrated. Ó 2014 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/3.0/).

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Optical micro-resonator chemical sensor

Cited by 6 publications

References 0 publications

Electric Field Poled Organic Electro-optic Materials: State of the Art and Future Prospects

Electric Field Poled Organic Electro-optic Materials: State of the Art and Future Prospects

Poled and unpoled polymers with chromophore dopants for optical sensors

Optofluidic spectroscopy integrated on optical fiber platform

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