Spitzer observations of planetary nebulae

Chu, You‐Hua

doi:10.1017/s1743921312010630

Cited by 1 publication

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References 51 publications

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“…The terahertz (THz) wave band (frequency range from 0.1 to 10 THz) contains the spectral fingerprint information of many celestial bodies and biological targets [ 1 , 2 ]. Therefore, THz detecting technology is regarded as a potential technical means for astronomical observation, medical diagnosis, nondestructive flaw detection, and so on.…”

Section: Introductionmentioning

confidence: 99%

Wavelength Modulation Characteristics of Metal Gratings on Si-Based Blocked-Impurity-Band (BIB) Terahertz Detectors

Chen¹,

Dong²,

Zhou³

et al. 2022

Micromachines

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In this work, the wavelength selection characteristics of metal gratings on Si-based blocked-impurity-band (BIB) detectors in the terahertz band were studied by performing experiments and a finite difference time domain (FDTD) simulation. The transmission spectra of metal gratings with different periods on 130 μm intrinsic Si substrates were measured. When the metal grating period increased from 16 to 20 to 32 μm, the peak position of the spectrum moved from 21.71 to 24.50 to 36.59 μm, which is in good agreement with the FDTD simulation results. The structure with the period of 32 μm shows the best wavelength selective transmission characteristics. Then, the bare Si-based BIB devices and metal grating/Si-based BIB hybrid devices with different thicknesses of blocking layers of 2 and 5 μm were fabricated. By covering different periods of metal gratings for the devices with a thicker blocking layer of 2 μm, we obtained more effective wavelength selection characteristics and stronger response spectra enhancement ratios that were about 1.3, 2.4, or 1.9 times. This was mainly due to the localized optical field enhancement effect of the plasmons resonance in metal gratings, which decays exponentially in a vertical direction. Our results demonstrate a new approach for the Si-based BIB detector to realize multiband selective detection applications.

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Section: Introductionmentioning

confidence: 99%