Near-field terahertz nonlinear optics with blue light

Angela Pizzuto; Pingchuan Ma; Daniel M. Mittleman

doi:10.1038/s41377-023-01137-y

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Near-field terahertz nonlinear optics with blue light

Original Articles

- Near-field terahertz nonlinear optics with blue light
- Light: Science & Applications Vol. 12, Issue 5, Pages: 838-846(2023)
- Affiliations：
  
  1.Department of Physics, Brown University, Providence, RI 02912, USA
  2.School of Engineering, Brown University, Providence, RI 02912, USA
- Author bio：
  
  Angela Pizzuto (angela_pizzuto@brown.edu)
- Funds：
- DOI：10.1038/s41377-023-01137-y
  CLC：
- Published：31 May 2023，
  
  Published Online：19 April 2023，
  
  Received：8 September 2022，
  
  Revised：15 February 2023，
  
  Accepted：20 March 2023
Scan for full text
Pizzuto, A., Ma, P. C. & Mittleman, D. M. Near-field terahertz nonlinear optics with blue light. Light: Science & Applications, 12, 838-846 (2023).
DOI：

Pizzuto, A., Ma, P. C. & Mittleman, D. M. Near-field terahertz nonlinear optics with blue light. Light: Science & Applications, 12, 838-846 (2023). DOI： 10.1038/s41377-023-01137-y.

摘要

Abstract

The coupling of terahertz optical techniques to scattering-type scanning near-field microscopy (s-SNOM) has recently emerged as a valuable new paradigm for probing the properties of semiconductors and other materials on the nanoscale. Researchers have demonstrated a family of related techniques

including terahertz nanoscopy (elastic scattering

based on linear optics)

time-resolved methods

and nanoscale terahertz emission spectroscopy. However

as with nearly all examples of s-SNOM since the technique's inception in the mid-1990s

the wavelength of the optical source coupled to the near-field tip is long

usually at energies of 2.5 eV or less. Challenges in coupling of shorter wavelengths (i.e.

blue light) to the nanotip has greatly inhibited the study of nanoscale phenomena in wide bandgap materials such as Si and GaN. Here

we describe the first experimental demonstration of s-SNOM using blue light. With femtosecond pulses at 410 nm

we generate terahertz pulses directly from bulk silicon

spatially resolved with nanoscale resolution

and show that these signals provide spectroscopic information that cannot be obtained using near-infrared excitation. We develop a new theoretical framework to account for this nonlinear interaction

which enables accurate extraction of material parameters. This work establishes a new realm of possibilities for the study of technologically relevant wide-bandgap materials using s-SNOM methods.

关键词

Keywords

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