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Detection Wavelength Control of Uncooled Infrared Sensors Using Two-Dimensional Lattice Plasmonic Absorbers.

Takagawa Y, Ogawa S, Kimata M - Sensors (Basel) (2015)

Bottom Line: The results indicate that the detection wavelength is determined by the reciprocal-lattice vector for the PLAs.The ability to control the detection wavelength in this manner enables the application of such PLAs to many types of thermal IR sensors.The results obtained here represent an important step towards multi-color imaging in the IR region.

View Article: PubMed Central - PubMed

Affiliation: College of Science and Engineering, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan. Takagawa.Yosuke@ds.MitsubishiElectric.co.jp.

ABSTRACT
Wavelength-selective uncooled infrared (IR) sensors are highly promising for a wide range of applications, such as fire detection, gas analysis and biomedical analysis. We have recently developed wavelength-selective uncooled IR sensors using square lattice two-dimensional plasmonic absorbers (2-D PLAs). The PLAs consist of a periodic 2-D lattice of Au-based dimples, which allow photons to be manipulated using surface plasmon modes. In the present study, a detailed investigation into control of the detection wavelength was conducted by varying the PLA lattice structure. A comparison was made between wavelength-selective uncooled IR sensors with triangular and square PLA lattices that were fabricated using complementary metal oxide semiconductor and micromachining techniques. Selective enhancement of the responsivity could be achieved, and the detection wavelength for the triangular lattice was shorter than that for the square lattice. The results indicate that the detection wavelength is determined by the reciprocal-lattice vector for the PLAs. The ability to control the detection wavelength in this manner enables the application of such PLAs to many types of thermal IR sensors. The results obtained here represent an important step towards multi-color imaging in the IR region.

No MeSH data available.


(a) Measured spectral responsivity, and (b) measured and calculated relation between the surface period and the detection wavelength for triangular and square lattice 2-D PLAs.
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sensors-15-13660-f005: (a) Measured spectral responsivity, and (b) measured and calculated relation between the surface period and the detection wavelength for triangular and square lattice 2-D PLAs.

Mentions: The spectral responsivity of the developed sensors was measured. The sensors were set in a vacuum chamber with a Ge window under a pressure of 1 Pa. The sensor was irradiated with IR radiation from a blackbody at a temperature of 1000 K and with an aperture diameter of 15.9 mm, which passed through narrow bandpass filters for selection of the evaluation wavelength. The distance between the sensors and the blackbody was 200 mm. The incidence angle was normal to the sensor and a pinhole was used to restrict the incident IR radiation to only the absorber area. The sensor output voltage was monitored by a computer. The responsivity was calculated as the ratio between the output voltage difference for the on and off states and the input power. The input power was calculated taking into account the measurement system parameters, absorber area, transmittance from the blackbody to the sensor through the atmosphere, narrow bandpass filters and the Ge window, and the spectral radiant emittance equation at the evaluated wavelength, as previously reported [16,17]. The measured diameters and periods of the surface structures were respectively: (i) 3.0 and 4.5 μm; (ii) 4.0 and 5.0 μm; (iii) 4.0 and 5.5 μm; (iv) 4.0 and 6.5 μm; (v) 6.0 and 7.0 μm; (vi) 6.0 and 8.0 μm; and (vii) 6.0 and 10.5 μm. The depth of the periodic lattice structures was fixed at 1.5 μm for all sensors. Figure 5a shows the measured spectral responsivity. Figure 5b shows the measured and theoretical dependence of the peak wavelength on the surface period. The spectral responsivity of the square lattice 2-D PLAs is also shown in Figure 5a,b for comparison. The measured results for the square lattice, except for structure (iii) and (v), were taken from our previous report [17].


Detection Wavelength Control of Uncooled Infrared Sensors Using Two-Dimensional Lattice Plasmonic Absorbers.

Takagawa Y, Ogawa S, Kimata M - Sensors (Basel) (2015)

(a) Measured spectral responsivity, and (b) measured and calculated relation between the surface period and the detection wavelength for triangular and square lattice 2-D PLAs.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507672&req=5

sensors-15-13660-f005: (a) Measured spectral responsivity, and (b) measured and calculated relation between the surface period and the detection wavelength for triangular and square lattice 2-D PLAs.
Mentions: The spectral responsivity of the developed sensors was measured. The sensors were set in a vacuum chamber with a Ge window under a pressure of 1 Pa. The sensor was irradiated with IR radiation from a blackbody at a temperature of 1000 K and with an aperture diameter of 15.9 mm, which passed through narrow bandpass filters for selection of the evaluation wavelength. The distance between the sensors and the blackbody was 200 mm. The incidence angle was normal to the sensor and a pinhole was used to restrict the incident IR radiation to only the absorber area. The sensor output voltage was monitored by a computer. The responsivity was calculated as the ratio between the output voltage difference for the on and off states and the input power. The input power was calculated taking into account the measurement system parameters, absorber area, transmittance from the blackbody to the sensor through the atmosphere, narrow bandpass filters and the Ge window, and the spectral radiant emittance equation at the evaluated wavelength, as previously reported [16,17]. The measured diameters and periods of the surface structures were respectively: (i) 3.0 and 4.5 μm; (ii) 4.0 and 5.0 μm; (iii) 4.0 and 5.5 μm; (iv) 4.0 and 6.5 μm; (v) 6.0 and 7.0 μm; (vi) 6.0 and 8.0 μm; and (vii) 6.0 and 10.5 μm. The depth of the periodic lattice structures was fixed at 1.5 μm for all sensors. Figure 5a shows the measured spectral responsivity. Figure 5b shows the measured and theoretical dependence of the peak wavelength on the surface period. The spectral responsivity of the square lattice 2-D PLAs is also shown in Figure 5a,b for comparison. The measured results for the square lattice, except for structure (iii) and (v), were taken from our previous report [17].

Bottom Line: The results indicate that the detection wavelength is determined by the reciprocal-lattice vector for the PLAs.The ability to control the detection wavelength in this manner enables the application of such PLAs to many types of thermal IR sensors.The results obtained here represent an important step towards multi-color imaging in the IR region.

View Article: PubMed Central - PubMed

Affiliation: College of Science and Engineering, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan. Takagawa.Yosuke@ds.MitsubishiElectric.co.jp.

ABSTRACT
Wavelength-selective uncooled infrared (IR) sensors are highly promising for a wide range of applications, such as fire detection, gas analysis and biomedical analysis. We have recently developed wavelength-selective uncooled IR sensors using square lattice two-dimensional plasmonic absorbers (2-D PLAs). The PLAs consist of a periodic 2-D lattice of Au-based dimples, which allow photons to be manipulated using surface plasmon modes. In the present study, a detailed investigation into control of the detection wavelength was conducted by varying the PLA lattice structure. A comparison was made between wavelength-selective uncooled IR sensors with triangular and square PLA lattices that were fabricated using complementary metal oxide semiconductor and micromachining techniques. Selective enhancement of the responsivity could be achieved, and the detection wavelength for the triangular lattice was shorter than that for the square lattice. The results indicate that the detection wavelength is determined by the reciprocal-lattice vector for the PLAs. The ability to control the detection wavelength in this manner enables the application of such PLAs to many types of thermal IR sensors. The results obtained here represent an important step towards multi-color imaging in the IR region.

No MeSH data available.