Report
Sub-wavelength near field imaging techniques at terahertz frequencies
| العنوان: | Sub-wavelength near field imaging techniques at terahertz frequencies |
|---|---|
| المؤلفون: | Giordano, MC, Viti, L, Mitrofanov, O, Scamarcio, G, Mastel, S, Hillenbrand, R, Ercolani, D, Sorba, L, Vitiello, MS |
| المساهمون: | Razeghi, M, Brown, GJ, Lewis, JS, Leo, G |
| المصدر: | In: Razeghi, M and Brown, GJ and Lewis, JS and Leo, G, (eds.) Proceedings of the Quantum Sensing and Nano Electronics and Photonics XV. SPIE: Bellingham (WA), USA. (2018) |
| بيانات النشر: | SPIE Conference on Quantum Sensing and Nano Electronics and Photonics XV |
| سنة النشر: | 2018 |
| المجموعة: | University College London: UCL Discovery |
| مصطلحات موضوعية: | Terahertz radiation, Near field, Near field optics, Quantum cascade lasers, Signal detection, Sensors, Spatial resolution |
| الوصف: | Near-field imaging techniques at terahertz (THz) frequencies are severely restricted by diffraction. To date, different detection schemes have been developed, based either on sub-wavelength metallic apertures or on sharp metallic tips. However high-resolution THz imaging, so far, has been relying predominantly on detection techniques that require either an ultrafast laser or a cryogenically-cooled THz detector, at the expenses of a lack of sensitivity when high resolution levels are needed. Here, we demonstrate two novel near-field THz imaging techniques able to combine strongly sub-wavelength spatial resolution with highly sensitive amplitude and phase detection capability. The first technique exploits an interferometric optical setup based on a THz quantum cascade laser (QCL) and on a near-field probe nanodetector, operating at room temperature. By performing phase-sensitive imaging of THz intensity patterns we demonstrate the potential of our novel architecture for coherent imaging with sub-wavelength spatial resolution improved up to 17 μm. The second technique is a detector-less s-SNOM system, exploiting a THz QCL as source and detector simultaneously. This approach enables amplitude- and phase-sensitive imaging by self-mixing interferometry with spatial resolution of 60-70 nm. |
| نوع الوثيقة: | report |
| وصف الملف: | text |
| اللغة: | English |
| Relation: | https://discovery.ucl.ac.uk/id/eprint/10060151/1/Mitrofanov_Sub-wavelength%20near%20field%20imaging%20techniques%20at%20terahertz%20frequencies_AAM.pdf; https://discovery.ucl.ac.uk/id/eprint/10060151/ |
| الاتاحة: | https://discovery.ucl.ac.uk/id/eprint/10060151/1/Mitrofanov_Sub-wavelength%20near%20field%20imaging%20techniques%20at%20terahertz%20frequencies_AAM.pdf https://discovery.ucl.ac.uk/id/eprint/10060151/ |
| Rights: | open |
| رقم الانضمام: | edsbas.DA2FECEF |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |