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28 Jul 2003

Volume 83, Issue 4, pp. 593-811

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Appl. Phys. Lett. 83, 611 (2003); http://dx.doi.org/10.1063/1.1595724 (3 pages)

Chung-Chih Wu, Chieh-Wei Chen, and Ting-Yi Cho
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Component spatial pattern analysis of chemicals using terahertz spectroscopic imaging

Y. Watanabe, K. Kawase, T. Ikari, H. Ito, Y. Ishikawa, and H. Minamide

Appl. Phys. Lett. 83, 800 (2003); http://dx.doi.org/10.1063/1.1595132 (3 pages) | Cited 43 times

Online Publication Date: 22 July 2003

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We demonstrated the separation of the component spatial patterns of chemical samples in transillumination terahertz (THz) images using known spectral curves. The images and spectral data were measured between 1.3 and 1.8 THz, using a widely tunable coherent THz-wave parametric oscillator source. This method could be effective for analyzing spatial patterns and the concentrations of components with various chemical compositions. © 2003 American Institute of Physics.
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82.80.Gk Analytical methods involving vibrational spectroscopy
07.57.Pt Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing

High performance sensing of nitrogen oxides by surface plasmon resonance excited fluorescence of dye-doped deoxyribonucleic acid thin films

Toshihiko Nagamura, Misato Yamamoto, Michiyo Terasawa, and Koji Shiratori

Appl. Phys. Lett. 83, 803 (2003); http://dx.doi.org/10.1063/1.1595722 (3 pages) | Cited 6 times

Online Publication Date: 22 July 2003

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Highly sensitive, fast responsive, and highly reversible sensing of nitrogen dioxide, nitric oxide, and nitrous oxide at a ppm-to-sub-ppm level has been achieved by fluorescence measurements upon excitation of various dye-doped deoxyribonucleic acid (DNA) or hydrophobic DNA thin films spincoated on a thin silver film by electric-field-enhanced evanescent light at surface plasmon resonance. The response time, sensitivity, or selectivity was controlled by combination of dyes and matrices. The present result will make a great many contributions to environmental and medical applications. © 2003 American Institute of Physics.
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07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
07.88.+y Instruments for environmental pollution measurements
82.80.Dx Analytical methods involving electronic spectroscopy
87.14.G- Nucleic acids
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
78.68.+m Optical properties of surfaces
78.55.Kz Solid organic materials
78.66.Qn Polymers; organic compounds
87.15.M- Spectra of biomolecules

Low angular-dispersion microwave absorption of a dual-pitch nondiffracting metal bigrating

Matthew J. Lockyear, Alastair P. Hibbins, J. Roy Sambles, and Christopher R. Lawrence

Appl. Phys. Lett. 83, 806 (2003); http://dx.doi.org/10.1063/1.1593229 (3 pages) | Cited 7 times

Online Publication Date: 22 July 2003

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The surface plasmon modes supported by a nondiffracting 90° bigrating consisting of three grooves per repeat period with one slightly shallower than the other two are characterized by studying the reflectivity from the structure as a function of the angle of incidence and the incident wavelength (11.3<λ0<16.7 mm). This structure supports two remarkably angle-independent modes plus a further, lower-energy mode which is more dispersive. Experimental reflectivity is compared with that calculated using a finite element model. In addition, to understand the character of each of the modes, the spatial form of the electromagnetic fields at the resonant frequencies are explored. © 2003 American Institute of Physics.
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73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
71.36.+c Polaritons (including photon-phonon and photon-magnon interactions)
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