Laser THz emission nanoscopy and THz nanoscopy

Optics Express
Angela PizzutoPernille Klarskov

Abstract

We present an experimental and theoretical comparison of two different scattering-type scanning near-field optical microscopy (s-SNOM) based techniques in the terahertz regime; nanoscale reflection-type terahertz time-domain spectroscopy (THz nanoscopy) and nanoscale laser terahertz emission microscopy, or laser terahertz emission nanoscopy (LTEN). We show that complementary information regarding a material's charge carriers can be gained from these techniques when employed back-to-back. For the specific case of THz nanoscopy and LTEN imaging performed on a lightly p-doped InAs sample, we were able to record waveforms with detector signal components demodulated up to the 6th and the 10th harmonic of the tip oscillation frequency, and measure a THz near-field confinement down to 11 nm. A computational approach for determining the spatial confinement of the enhanced electric field in the near-field region of the conductive probe is presented, which manifests an effective "tip sharpening" in the case of nanoscale LTEN due to the alternative geometry and optical nonlinearity of the THz generation mechanism. Finally, we demonstrate the utility of the finite dipole model (FDM) in predicting the broadband scattered THz electric field,...Continue Reading

References

Jun 11, 2008·Optics Express·H-G von RibbeckF Keilmann
Oct 15, 1989·Optics Letters·M ExterD Grischkowsky
Jun 23, 2012·Nature·Jianing ChenFrank H L Koppens
Apr 27, 2013·Nanotechnology·Hannah J JoyceMichael B Johnston
Oct 15, 2013·Nature Nanotechnology·Z FeiD N Basov
May 2, 2013·The Journal of Physical Chemistry Letters·Alexander A GovyadinovRainer Hillenbrand
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Dec 13, 2016·Nature Nanotechnology·Markus A HuberRupert Huber
May 13, 2017·Scientific Reports·Filchito Renee BagsicanIwao Kawayama
May 3, 2018·Optics Express·Daniel M Mittleman
Sep 13, 2019·Optics Express·Neda Alsadat AghamiriYohannes Abate

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Citations

May 15, 2021·Optics Express·Angela PizzutoDaniel M Mittleman
Jul 31, 2021·Optics Letters·Fabian MooshammerRupert Huber

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