Abstract
A multi-band infrared thermal emitter with polarized waveguide resonances was investigated. The device is constructed by embedding the metallic grating strips within the resonant cavity of a metal/dielectric/metal (MDM) structure. The proposed arrangement makes it possible to generate waveguide resonances with mutually orthogonal polarization, thereby providing an additional degree of freedom to vary the resonant wavelengths and polarizations in the medium infrared region. The measured reflection spectra and the finite-difference time-domain (FDTD) simulation indicated that the electric fields of the waveguide modes with two orthogonal polarizations are distributed in different regions of the cavity. Resonant wavelengths in different polarizations can be adjusted by altering the period, the metallic line width, or the position of the embedded gold strips. The ratio of the full width at half maximum (FWHM) to the peak wavelength was achieved to be smaller than 0.035. This study demonstrated a multi-band infrared thermal emission featuring a narrow bandwidth and polarization characteristics, which is quite suitable to be applied to the non-dispersive infrared (NDIR) detection system.
Highlights
The target molecules can be detected by measuring the transmission optical energy at specific wavelengths due to particular molecular bond vibration, which is inversely proportional to the molecular concentration in the Non-dispersive infrared (NDIR) system
The embedded Au grating within the dielectric cavity acts as a polarization divider that separates the waveguide resonance into two mutually orthogonal polarization states
The resonant wavelength of waveguide mode is determined by the effective cavity length which is affected by the embedded Au strips
Summary
Cite as: AIP Advances 7, 085122 (2017); https://doi.org/10.1063/1.4995017 Submitted: 10 July 2017 • Accepted: 21 August 2017 • Published Online: 30 August 2017 Wei-Lun Huang, Hui-Hsin Hsiao, Chih-Yu Lin, et al. ARTICLES YOU MAY BE INTERESTED IN Triple-wavelength infrared plasmonic thermal emitter using hybrid dielectric materials in periodic arrangement Applied Physics Letters 109, 063107 (2016); https://doi.org/10.1063/1.4960664 Double wavelength infrared emission by localized surface plasmonic thermal emitter Applied Physics Letters 104, 083114 (2014); https://doi.org/10.1063/1.4866964 Plasmonic nanochannel structure for narrow-band selective thermal emitter Applied Physics Letters 110, 251102 (2017); https://doi.org/10.1063/1.4989692 Waveguide resonances with selectable polarization in an infrared thermal emitter Wei-Lun Huang,[1] Hui-Hsin Hsiao,1,a Chih-Yu Lin,1,a Ming-Ru Tang,[2] and Si-Chen Lee1,2,b 1Department of Electrical Engineering, Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan 2Department of Electrical Engineering, Graduate Institute of Electronics Engineering, National Taiwan University, Taipei 10617, Taiwan (Received 10 July 2017; accepted 21 August 2017; published online 30 August 2017)
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