High-resolution antenna near-field imaging and sub-THz measurements with a small atomic vapor-cell sensing element

David A. Anderson; Eric Paradis; Georg Raithel; Rachel E. Sapiro; Christopher L. Holloway

doi:10.1109/gsmm.2018.8439437

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arXiv · 1804.09789

High-resolution antenna near-field imaging and sub-THz measurements with a small atomic vapor-cell sensing element

David A. Anderson·Eric Paradis·Georg Raithel·Rachel E. Sapiro·Christopher L. Holloway

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Abstract

Atomic sensing and measurement of millimeter-wave (mmW) and THz electric fields using quantum-optical EIT spectroscopy of Rydberg states in atomic vapors has garnered significant interest in recent years towards the development of atomic electric-field standards and sensor technologies. Here we describe recent work employing small atomic vapor cell sensing elements for near-field imaging of the radiation pattern of a K$_u$-band horn antenna at 13.49 GHz. We image fields at a spatial resolution of $\lambda/10$ and measure over a 72 to 240 V/m field range using off-resonance AC-Stark shifts of a Rydberg resonance. The same atomic sensing element is used to measure sub-THz electric fields at 255 GHz, an increase in mmW-frequency by more than one order of magnitude. The sub-THz field is measured over a continuous $\pm$100 MHz frequency band using a near-resonant mmW atomic transition.

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David A. Anderson, Eric Paradis, Georg Raithel, Rachel E. Sapiro, Christopher L. Holloway. 2018-04-25. High-resolution antenna near-field imaging and sub-THz measurements with a small atomic vapor-cell sensing element. https://doi.org/10.1109/gsmm.2018.8439437

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