&lt;title&gt;Whispering-gallery-mode evanescent-wave microsensor for trace-gas detection&lt;/title&gt;

Finite-element simulations of nanoscale molecule interaction with the evanescent radiation field of an optical resonant microcavity are conducted to characterize the detection of single transparent molecules using the microcavity as an extremely sensitive micro/nano-sensor. The model sensor is an integrated device consisting of a dielectric microdisk and a waveguide that can be nanofabricated on Si-based dielectric thin film. When the microdisk is operated at a whispering-gallery mode, a strong evanescent field arises, surrounding the periphery of the cavity. Foreign target molecules such as proteins present in the near-field will interact with the electromagnetic resonant field and induce changes to the resonance. Such induced changes are investigated in this report and their significance in the detection of single molecules for nanotechnology development is discussed.

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“…Other means such as measuring transmission reduction [21] or using cavity ringdown techniques [22] could be exploited.…”

Section: Resultsmentioning

confidence: 99%

Simulation of single transparent molecule interaction with an optical microcavity

Quan

Guo²

2007

Nanotechnology

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“…In order to obtain strong signal in the output port, t should be larger thanα as far as possible. So according to equation (1) to (5), if some certain coupling parameters vary, in such a case, the Q of the system and the transmitted spectrum will change correspondingly. …”

Section: Coupling Theorymentioning

confidence: 98%

“…In recent years, micrometer sized-optical cavities are of great interest for their potential applications in diverse fields including detection of trace gases [1] and protein [2] , automobile industry [3] , basic research of photosynthesis [4] and quantum informatics [5][6] . Typically, Planar Microtoroid cavities ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Microsensors based on planar microtoroid cavities

Xiong

Yan

et al. 2008

SPIE Proceedings

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Planar Microtoroid cavities with ultrahigh quality factor have very strong confined function to the electromagnetic wave coupled into them due to their novel ring-like structures. Therefore, they have very good applications in high sensitivity sensors and other micro optics components. In this paper, the Planar Microtoroid cavity and its coupling system constructed together with the tapered fiber are introduced. Then, micro sensors based on the above coupling system are designed. These sensors measure environmental parameters by means of monitoring the changes in the transmission spectrum of the high finesse Planar Microtoroid cavities, obtaining fine resolution and high accuracy due to their ultrahigh quality factor (Q) performance. The sensitive mechanism and the feasibility are demonstrated through optical and mechanical software simulation. With software BeamPROP, the evident resonance and strengthened phenomenon to the electromagnetic wave coupled into the micro-cavity are shown, which have a big relation with the light frequency.The results indicate that, Planar Microtoroid cavity is very promising in designing new micro sensors.

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“…These modes are also denoted as the morphology-dependent resonant MDR modes due to their high sensitivity to morphological variations (for example the dimension, shape, or refractive index) of the optical sensors. By monitoring the MDR shifts, these cavities can be used to accurately sense and measure various phenomena of the surrounding environment [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Dangling Bonds on De-Poling Time for Polymeric Electric Field Optical Sensors

2018

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This paper investigates the possible chemical changes in polydimethylsiloxane (PDMS) caused by two different techniques of fabrication for ultra-sensitive electric field optical sensors. The sensing element is a micro-sphere made from 60:1 PDMS (60 parts base silicon elastomer to one part polymer curing agent by volume). The measurement principle is based on the morphology dependent resonances (MDR) shifts of the micro-sphere. We present the effects of curing and poling of polymer micro-spheres used as optical sensors. The degree of curing leads to changes in the de-poling time which results from dangling bonds in the polymeric chains. Consequently, the longevity of the sensitivity of the sensor can extended by two orders of magnitude. An analysis is carried out along with preliminary experiments to investigate that behavior.

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<title>Whispering-gallery-mode evanescent-wave microsensor for trace-gas detection</title>

Cited by 31 publications

References 0 publications

Simulation of single transparent molecule interaction with an optical microcavity

Simulation of single transparent molecule interaction with an optical microcavity

Microsensors based on planar microtoroid cavities

Effect of Dangling Bonds on De-Poling Time for Polymeric Electric Field Optical Sensors

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