Photonic crystal‐based fluid sensors: Toward practical application

Amrehn, Sabrina; Wu, Xia; Schumacher, Christian; Wagner, Thorsten

doi:10.1002/pssa.201431875

Cited by 25 publications

(19 citation statements)

References 23 publications

(23 reference statements)

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“…A change of refractive index of the pore fluid causes variations in the photonic band gap which can be observed as change in the wavelength of reflected light of the crystal (color change). Based on this principle, we used for identification of ethanol concentration [28].…”

Section: Ethanol Concentration Examined By Ps Opal and Tio2 Inverse Omentioning

confidence: 99%

Photonic Crystal-Based Sensors for Detecting Alcohol Concentration

et al. 2016

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Polystyrene (PS) opal and titania (TiO 2 ) inverse opal films were fabricated by the self-assembly colloidal crystal template technique. Based on Bragg's law, these sensors were used to detect the different concentrations of ethanol solution. The results indicated that TiO 2 inverse opal films were advantageous over PS opal film for detecting the ethanol concentration. TiO 2 inverse opal films sintered at 600˝C retained the highest sensitivity for ethanol concentration identification, since the anatase phase was transformed into the rutile phase, which resulted in an enhancement of the refractive index, i.e., an increase in the amount of the red shift.

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Section: Ethanol Concentration Examined By Ps Opal and Tio2 Inverse Omentioning

confidence: 99%

Photonic Crystal-Based Sensors for Detecting Alcohol Concentration

et al. 2016

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“…The spherical pores are positioned on the lattice points of the opal spheres. Further details of the synthesis are described elsewhere (Amrehn et al, 2015). Utilizing a custom-built measurement cell (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore a change of the refractive index of a fluid introduced into the pores can be monitored by determining the position of the reflection bands. In a previous work this was demonstrated utilizing a grating-based spectrometer as a readout device (Amrehn et al, 2015), which, however, is quite costly. As will be shown in the following, the diode-based readout unit presented here achieves comparable or even better performance without the need for additional data processing.…”

Section: Photonic Crystal-based Fluid Sensormentioning

confidence: 99%

“…The two most promising working principles are the measurement of wavelength shifts of a single spectral peak and the ratiometric change of two-peak signals. Examples include localized surface plasmon resonance (LSPR) substrates (Steinke et al, 2015;Katzmann et al, 2012) and photonic crystal (PhC) structures (Amrehn et al, 2015) for biological and chemical sensing or gallium arsenide (GaAs) temperature fiber sensors (Willsch et al, 2014) and inorganic phosphor materials for thermometry (Klier and Kumke, 2015). Sensors made of these materials and structures are characterized by high sensitivity, electrical passivity, immunity against intensity fluctuations and applicability under extreme conditions (temperature, humidity, electromagnetic fields, etc.).…”

Section: Introductionmentioning

confidence: 99%

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A compact readout platform for spectral-optical sensors

Wuchrer

Amrehn

Liu

et al. 2016

J. Sens. Sens. Syst.

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Abstract. The continuous monitoring of industrial and environmental processes is becoming an increasingly important aspect with both economic and societal impact. So far, spectral-optical sensors with their outstanding properties in terms of sensitivity and reliability have not been considered as a potential solution because of the cost-intensive and bulky readout hardware. Here we present a card-size, inexpensive, and robust readout platform based on a wavelength-sensitive photodiode. In test and characterization experiments we achieved a wavelength shift resolution of better than 0.1 nm and a detection limit of 0.001 AU for ratiometric measurements. We furthermore discuss the capability and current limitations of our readout unit in context with interrogation experiments we performed with a photonic crystal-based fluid sensor. In sum we expect the presented readout platform to foster the exploitation of spectral-optical sensor technology for gas monitoring, chemical analytics, biosensing and many others fields.

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“…This mechanism can be used, for example, to detect liquids with different refractive indices (Amrehn et al, 2015). Another typical mechanism is based on the reaction of the detected species with the solid phase itself, inducing a variation of electronic and optical properties of the photonic crystals (Xie et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

High-temperature stable indium oxide photonic crystals: transducer material for optical and resistive gas sensing

Amrehn

Wagner

2016

J. Sens. Sens. Syst.

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Abstract. Indium oxide (In 2 O 3 ) inverse opal is a promising new transducer material for resistive and optical gas sensors. The periodically ordered and highly accessible pores of the inverse opal allow the design of resistive sensors with characteristics independent of structure limitations, such as diffusion effects or limited conductivity due to constricted crosslinking. Additionally the photonic properties caused by the inverse opal structure can be utilized to read out the sensors' electronical state by optical methods. Typically semiconducting sensors are operated at high temperatures (> 300 • C). To maintain a good thermal stability of the transducer material during operation is a minimum requirement. We present results on the synthesis and investigation of the structural stability of the In 2 O 3 inverse opal structure up to a temperature of 550 • C (limit of substrate material). As will be shown, their optical properties are maintained with only slight shifts of the photonic band gaps which can be explained by the results from the structural characterization using X-ray diffraction and electron microscopy combined with optical simulations.

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Photonic crystal‐based fluid sensors: Toward practical application

Cited by 25 publications

References 23 publications

Photonic Crystal-Based Sensors for Detecting Alcohol Concentration

Photonic Crystal-Based Sensors for Detecting Alcohol Concentration

A compact readout platform for spectral-optical sensors

High-temperature stable indium oxide photonic crystals: transducer material for optical and resistive gas sensing

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