An integrated optical platform for absorptive sensing of chemical concentrations using chemo-optical monolayers

Koster, T.M.; Lambeck, Paul

doi:10.1088/0957-0233/13/8/310

Cited by 6 publications

(6 citation statements)

References 16 publications

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“…Currently, in our laboratory the converter has been successfully implemented in several integrated optical sensing platforms, such as a fully integrated optical polarimeter [14] and a differential absorption sensor [23]. In these circuits, the converters are used for partial conversion of a launched TE mode into a TM-polarized mode and also for obtaining the interference of TE-and TM-polarized zeroth order modes.…”

Section: Discussionmentioning

confidence: 99%

Passive polarization converter in SiON technology

Koster

Lambeck

2001

J. Lightwave Technol.

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Abstract-A passive polarization converter has been realized in silicon oxynitride (SiON) technology. The device is a grating assisted codirectional coupler consisting of segments of asymmetrically etched ridge waveguides. By using a double-masking technique, the fabrication of the device is tolerant with respect to the alignment of the required masks. Conversion efficiencies up to 0.98 (TE TM and TM TE) and insertion losses of 3 dB/cm have been measured. Using 2-D beam propagation method simulations, an observed beat pattern in the converter could be explained as due to a leaky mode, which is captured in the grating structure.

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Section: Discussionmentioning

confidence: 99%

Passive polarization converter in SiON technology

Koster

Lambeck

2001

J. Lightwave Technol.

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“…the absorption changes in the sensing layer due to the presence of other (non-specific) chemical species. As a result, serious degradation in the evanescent-wave sensor operation can occur [7]. To overcome this issue, reference waveguides are typically deployed such as in interferometric sensors, in order to distinguish real from spurious sensor response.…”

Section: Introductionmentioning

confidence: 99%

Mode-selective optical sensing using asymmetric waveguide junctions

Racz¹,

Bamiedakis²,

Penty³

2015

Sensors and Actuators A: Physical

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a b s t r a c tMeasuring a single analyte in a highly absorptive microfluidic channel has always been a challenge. Even with a highly selective sensing layer, other chemical species can affect the interrogation of the analyte. Matching the evanescent tail with the sensing layer thickness is difficult in case of evanescent field sensing. The tail typically extends beyond the sensing layer, introducing noise and spurious errors in the measurement, which scales up with analyte concentration. In this work therefore, we propose the use of a simple multimode evanescent waveguide sensor that eliminates such common spurious effects. The proposed mode-selective sensing system exploits the sensitivity differences between the different guided modes in detecting the effects of the outer medium in the sensor response. The operation of the sensor device relies on the use of an asymmetric waveguide junction, which enable efficient separation of waveguide modes and therefore detection of their differences in behaviour. The proposed device is shown through simulations to achieve very small estimation errors below 5%, even for very high absorption coefficients of the outer medium of up to 80 times larger than that of the sensing layer.

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“…It has been shown that such the absorption changes in the outer medium can be as large as 50 times higher than the absorption changes in the sensing layer due to the presence of other (non-specific) chemical species. As a result, serious degradation in the evanescent-wave sensor operation can occur [7]. To overcome this issue, reference waveguides are typically deployed such as in interferometric sensors, in order to distinguish real from spurious sensor response.…”

Section: Introductionmentioning

confidence: 99%

Mode-Selective Sensing using Asymmetric Waveguide Junctions

2014

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Measuring a single analyte in a highly absorptive microfluidic channel has always been a challenge. Even with a highly selective sensing layer, other chemical species can affect the interrogation of the analyte. Matching the evanescent tail with the sensing layer thickness is difficult in case of evanescent field sensing. The tail typically extends beyond the sensing layer, introducing noise and spurious errors in the measurement, which scales up with analyte concentration. In this work therefore, we propose the use of a simple multimode evanescent waveguide sensor that eliminates such common spurious effects. The proposed mode-selective sensing system exploits the sensitivity differences between the different guided modes in detecting the effects of the outer medium in the sensor response. The operation of the sensor device relies on the use of an asymmetric waveguide junction, which enable efficient separation of waveguide modes and therefore detection of their differences in behaviour. The proposed device is shown through simulations to achieve very small estimation errors below 5%, even for very high absorption coefficients of the outer medium of up to 80 times larger than that of the sensing layer.

show abstract

An integrated optical platform for absorptive sensing of chemical concentrations using chemo-optical monolayers

Cited by 6 publications

References 16 publications

Passive polarization converter in SiON technology

Passive polarization converter in SiON technology

Mode-selective optical sensing using asymmetric waveguide junctions

Mode-Selective Sensing using Asymmetric Waveguide Junctions

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