Workshop on High-Field THz Science
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Workshop on High-Field THz Science High Power THz Generation and THz Field Enhancement in Nanostructures. Fabian Brunner 1 , Salvatore Bagiante 2 , Florian Enderli 1 , Justyna Fabianska 1 , and Thomas Feurer 1 1 Institute of Applied Physics, University of Bern, Switzerland

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Workshop on High-Field THz Science High Power THz Generation and THz Field Enhancement in Nanostructures

Fabian Brunner1, Salvatore Bagiante2, Florian Enderli1, Justyna Fabianska1, and Thomas Feurer1

1Institute of Applied Physics, University of Bern, Switzerland

2Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, Switzerland


Outline
Outline

  • Introduction: Applications of strong electric and magnetic fields at THz frequencies

  • Generation of intense THz pulses in nonlinear optical crystals

  • THz field enhancement in metallic nanostructures

  • THz SHG in lithium niobate crystals

  • Conclusions


Applications of strong electric and magnetic fields at thz frequencies
Applications of strong electric and magnetic fields at THz frequencies

  • Nonlinear optics at THz frequencies (bulk semiconductors, quantum dots, …)

  • Direct excitation of transverse optical phonons or anti-ferromagnetic spin waves

  • Acceleration of charged particles and measurements of electron bunch profiles (THz streak camera)

  • Single shot imaging


Efficient thz generation in nlo crystals requirements for the crystals
Efficient THz generation in NLO crystals: frequencies Requirements for the crystals

  • A large tensor element of the nonlinear optical susceptibility

  • Low linear and nonlinear optical absorption

  • Low THz absorption

  • Phase-matching:

    • collinear:(organic nonlinear optical crystals: DAST, OH1,…)

    • Cherenkov-type:(LiNbO3)




Peak electric field vs pulse energy
Peak electric field vs. pulse energy frequencies

Assumptions:

  • Single cycle pulse

  • Focusing with F# = 1


Non resonant enhancement array of slits
Non-resonant enhancement: frequencies array of slits

Typical field enhancement of a slit

Gold slit array on silicon


Ideal periodicity of slit array
Ideal periodicity of slit array frequencies

  • most effective harvesting of incident field

  • Nonlinear signal: trade-off between volume of high field strength and high field enhancement


Resonant enhancement split ring resonators
Resonant enhancement: frequencies Split ring resonators

31 nm


Second harmonic generation in linbo 3
Second harmonic generation in LiNbO frequencies 3

Fabrication of the sample

Simulated spectra of transmitted pulses


Conclusions
Conclusions frequencies

  • Combination of high power THz source with local field enhancement enables new experiments

  • Fabrication of gold nano-structures on silicon

  • New fabrication process for gold nano-slits filled with lithium niobate

  • Simulation of SHG spectra and optimization of geometry parameters for the highest conversion efficiency


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