Academic Journal
Photoconductive terahertz near-field detectors for operation with 1550-nm pulsed friber lasers
| العنوان: | Photoconductive terahertz near-field detectors for operation with 1550-nm pulsed friber lasers |
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| المؤلفون: | Sawallich, S., Globisch, B., Matheisen, C., Nagel, M., Dietz, R.J.B., Göbel, T. |
| سنة النشر: | 2016 |
| المجموعة: | Publikationsdatenbank der Fraunhofer-Gesellschaft |
| الوصف: | S.365-370 ; We present a new generation of photoconductive (PC) terahertz (THz) near-field probes based on freestanding Beryllium-doped low-temperature-grown InGaAs/InAlAs cantilevers. The PC probes are compatible to optical gating with a femtosecond laser having a center wavelength of 1550 nm. Therefore, they are well suited for a cost-efficient direct integration with fiber-coupled THz time-domain spectroscopy (TDS) systems. The photoconductor material features electron lifetimes of 500 fs allowing for broadband detection up to 2 THz, which is comparable to existing LT-GaAs-based near-field detectors, which require 800-nm wavelength excitation. We demonstrate the detector operation in a state-of-the-art fiber-based TDS system with fast and coherent data acquisition and show obtained sheet-resistance mappings of conductive thin-films featuring subwavelength resolution. ; 6 ; Nr.3 |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | IEEE Transactions on Terahertz Science and Technology; https://publica.fraunhofer.de/handle/publica/250088 |
| DOI: | 10.1109/TTHZ.2016.2549365 |
| الاتاحة: | https://publica.fraunhofer.de/handle/publica/250088 https://doi.org/10.1109/TTHZ.2016.2549365 |
| رقم الانضمام: | edsbas.25967C35 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1109/TTHZ.2016.2549365 |
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