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Magneto-photonic crystal optical sensors with sensitive covers
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Schematic representation of the MPC optical sensor with receptor layer. (b) Scanning electron micrograph of the grating region of the sensor. (c) PR versus cover index for a series of liquid analytes.

Image of FIG. 2.
FIG. 2.

(Color online) Measured transmittance (for air cover) and PR of PPy deposited PC before and after exposure to (a) aq. NH3, with polarization transduction signal ∼50° for different samples. (b) MeOH, polarization transduction signal ∼10°, for different samples, showing consistently sensitive and easily measurable response. PR angles for both θ (solid squares), and 180° + θ (open squares) are shown for wavelengths below 1550 nm for Figure 2(a) and below 1525 nm for Figure 2(b). The insets show the degree of polarization and ellipticity for when PPy cover exposed to aq. NH3 and MeOH, respectively.

Image of FIG. 3.
FIG. 3.

(Color online) PR for fundamental to third-order backscattered mode stop bands with air, GNP and thiolated GNP as covers. In our measurements, the angle and its 180° complement are indistinguishable. The inset plots 1, 2, and 3 show degree of polarization, transmittance, and ellipticity for air cover, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magneto-photonic crystal optical sensors with sensitive covers