Terahertz near-field microscopy with subwavelength spatial resolution based on photoconductive antennas

Applied Optics
Andreas BitzerMarkus Walther

Abstract

Imaging and sensing applications based on pulsed terahertz radiation have opened new possibilities for scientific and industrial applications. Many exploit the unique features of the terahertz (THz) spectral region, where common packaging materials are transparent and many chemical compounds show characteristic absorptions. Because of their diffraction limit, THz far-field imaging techniques lack microscopic resolution and, if subwavelength features have to be resolved, near-field techniques are required. Here, we present a THz near-field microscopy approach based on photoconductive antennas as the THz emitter and as a near-field probe. Our system allows us to measure amplitude, phase, and polarization of the electric fields in the vicinity of a sample with a spatial resolution on the micrometer scale (approximately lambda/20). Using a dielectric (plant leaf) and a metallic structure (microwire) as examples, we demonstrate the capabilities of our approach.

References

May 27, 2006·Science·J B PendryD R Smith
Jan 6, 2007·Science·Costas M SoukoulisMartin Wegener
Dec 8, 2007·Optics Letters·Q ChenX C Zhang
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Aug 15, 1995·Optics Letters·B B Hu, M C Nuss
Nov 13, 2009·Optics Express·Maik Scheller, Martin Koch
Dec 10, 2009·Optics Express·Andreas BitzerMarkus Walther

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Citations

Apr 14, 2010·Analytical and Bioanalytical Chemistry·Markus WaltherHanspeter Helm
May 23, 2015·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Lena ÖhrströmFrank Rühli
Mar 1, 2017·Optics Express·Wendy S L LeeChristophe Fumeaux
Jan 26, 2012·Optics Express·Bora UngMaksim Skorobogatiy
Mar 11, 2020·Cell Proliferation·Zaoxia LiHuabin Wang
May 23, 2013·Nano Letters·Yanjun MaJeremy Levy
May 4, 2011·Analytical Chemistry·Jason B Baxter, Glenn W Guglietta

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