Conversion from terahertz-guided waves to surface waves with metasurface
نویسندگان
چکیده
منابع مشابه
Imaging with terahertz waves.
We present what is to our knowledge the first imaging system based on optoelectronic terahertz time-domain spectroscopy. Terahertz time-domain waveforms are downconverted from the terahertz to the kilohertz frequency range, and the waveform for each pixel is frequency analyzed in real time with a digital signal processor to extract compositional information at that point. We demonstrate applica...
متن کاملTerahertz waves emitted from an optical fiber.
We report a simple method of creating terahertz waves by applying the photo-Dember effect in a (100)-oriented InAs film coated onto the 45-degree wedged-end facet of an optical fiber. The terahertz waves are generated by infrared pulses guided through the optical fiber which is nearly in contact with a sample and then measured by a conventional photo-conductive antenna detector. Using this alig...
متن کاملSurface and Guided Waves in Composites with Nematic Coatings
The theoretical prediction of the acoustical polarization effects in the heterogeneous composites, made of thick elastic solids with thin nematic films, is presented. The numericalanalytical solution to the problem of the different wave propagation exhibits some new physical effects in the low frequency domain: the appearance of the critical frequency and the existence of the narrow transition ...
متن کاملRail Inspection with Guided Waves
The critical subject of transverse crack detection in a rail head is treated in this paper. Conventional bulk wave ultrasonic techniques often fail because of shelling and other surface imperfections that shield the defects that lie below the shelling. A guided wave inspection technique is introduced here that can send ultrasonic energy along the rail under the shelling with a capability of fin...
متن کاملDamage and defect inspection with terahertz waves
We present recent results in applying pulsed and continuous-wave (CW) terahertz (THz) imaging and sensing techniques on damage and defect assessment in insulating foam and carbon fiber materials. The comparison between the optical inspections versus the THz image of the defects in the foam shows a very good agreement. For the carbon fiber samples, both THz imaging at 0.6 THz and time-domain dat...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Optics Express
سال: 2018
ISSN: 1094-4087
DOI: 10.1364/oe.26.031233