16.20 04 j anthony

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Research 3: J Anthony

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16.20 04 j anthony

  1. 1. Terahertz pulses propagation in microstructured photonic crystal fibers Jessienta Anthony a* Rainer Leonhardt a , Maryanne C. Large b , Alexander Argyros b , Sergio Leon-Saval b NZIP Conference 2011 a Physics Department, The University of Auckland, Auckland, NEW ZEALAND b Institute of Photonics and Optical Science (IPOS), School of Physics, The University of Sydney, Sydney NSW, AUSTRALIA [email_address]
  2. 2. Outline <ul><li>Introduction to terahertz (THz) </li></ul><ul><li>How to generate & detect THz? </li></ul><ul><li>Guiding the invisible THz in THz PCFs </li></ul><ul><li>Summary </li></ul>
  3. 3. What is THz? <ul><li>THz = Far-infrared = sub millimeter </li></ul><ul><li>Frequency range = .1 to 10 THz (  ~ 3 cm - .3  m) </li></ul><ul><li>Transparent to most materials: Plastics, clothing... </li></ul><ul><li>Reflected by metals, absorbed by water </li></ul>
  4. 4. Experimental Method <ul><li>Coherent , pulsed THz-TDS setup </li></ul>THz symmetric-pass lens design : Lo & Leonhardt, Opt. Expr. 16 , 15991 (2008) 
  5. 5. THz Photonic Crystal Fibers <ul><li>Solid core PCFs: High index guiding </li></ul>HDPE tube + rings PCF Han et. al , APL 80 , 2634 (2002) Large mode area Topas® PCF Nielsen et. al Opt. Expr. 17 , 8592 (2009) Zeonex® PCF Anthony et. al J OSA B 28 , 1013 (2011)
  6. 6. THz Photonic Crystal Fibers <ul><li>Solid core PCFs: High index guiding </li></ul><ul><li>Air core PCFs: Photonic bandgap guidance </li></ul>HDPE tube + rings PCF Han et. al , APL 80 , 2634 (2002) Large mode area Topas® PCF Nielsen et. al Opt. Expr. 17 , 8592 (2009) Zeonex® PCF Anthony et. al J OSA B 28 , 1013 (2011) Ring-structured Bragg PMMA PBGF Ponseca et. al Opt. Lett. 33 , 902 (2008) Kagome (‘Eye of the basket’) PMMA MOFs Anthony et. al Opt. Expr. 19 , 18470 (2011)
  7. 7. THz Photonic Crystal Fibers <ul><li>Solid core PCFs: High index guiding </li></ul><ul><li>Air core PCFs: Photonic bandgap guidance </li></ul>HDPE tube + rings PCF Han et. al , APL 80 , 2634 (2002) Large mode area Topas® PCF Nielsen et. al Opt. Expr. 17 , 8592 (2009) Zeonex® PCF Anthony et. al J OSA B 28 , 1013 (2011) Ring-structured Bragg PMMA PBGF Ponseca et. al Opt. Lett. 33 , 902 (2008) Kagome (‘Eye of the basket’) PMMA MOFs Anthony et. al Opt. Expr. 19 , 18470 (2011)
  8. 8. Zeonex Microstructured Fibers <ul><li>High index guidance  Modified total internal reflection </li></ul><ul><li>Material: Zeonex (n = 1.52;  = .13 cm -1 ) </li></ul><ul><li>Core diameter = 400  m; air filling fraction = 82% </li></ul>
  9. 9. Results <ul><li>Temporal evolution of fundamental mode in Zeonex fibers </li></ul>
  10. 10. Results <ul><li>Measured loss limited only to material loss, negligible waveguide loss . </li></ul>
  11. 11. Results <ul><li>Normal, low dispersion THz propagation as confirmed by model & simulations </li></ul>
  12. 12. Kagome Microstructured Fibers <ul><li>PMMA rings in a triangular pattern </li></ul><ul><li>Fabrication: Stack-and-draw preform </li></ul><ul><li>Core diameters: 1.8 mm, 2.2 mm </li></ul><ul><li>Strut thickness: ~55  m, ~65  m </li></ul>
  13. 13. Guiding mechanism of kagome <ul><li>Inhibited coupling: Minimized mode overlap of core mode and cladding mode </li></ul><ul><li>Loss characteristics: Determined by the strut thickness and index contrast </li></ul><ul><li>Spectral properties similar to ARROW*: High transmission loss due to modes supported by cladding solid struts </li></ul>A nti- R esonance R eflecting O ptical W aveguide [Litchinitser et al. , Opt. Expr. 11 , 1243 (2003)]
  14. 14. Results <ul><li>Temporal evolution of guided THz pulses in Kagome fibers </li></ul>
  15. 15. Results <ul><li>Kagome measured attenuation coefficient: < 0.6 cm -1 </li></ul>
  16. 16. Results <ul><li>Kagome mode scans: Fundamental mode only </li></ul>
  17. 17. Results <ul><li>Kagome mode scans: Fundamental mode only, good agreement with simulations </li></ul>
  18. 18. Results <ul><li>Phase index: Below unity, no coupling to modes in Kagome cladding </li></ul>
  19. 19. Results <ul><li>Wider transmission window; low dispersion THz propagation </li></ul>
  20. 20. Summary <ul><li>Introduction to THz, THz-TDS, THz PCFs </li></ul><ul><li>High index guiding in Zeonex PCF </li></ul><ul><li>Inhibited coupling in kagome </li></ul><ul><li>Characterize PCFs with THz-TDS </li></ul><ul><li>Discussion of results: Loss spectra, fundamental mode air-guidance. </li></ul><ul><li>PCFs open avenue towards low loss THz waveguides </li></ul>
  21. 21. Thank you

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