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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 5 — Mar. 1, 2014
  • pp: 1294–1297

10 aJ-level sensing of nanosecond pulse below 10 THz by frequency upconversion detection via DAST crystal: more than a 4 K bolometer

Feng Qi, Shuzhen Fan, Takashi Notake, Koji Nawata, Takeshi Matsukawa, Yuma Takida, and Hiroaki Minamide  »View Author Affiliations


Optics Letters, Vol. 39, Issue 5, pp. 1294-1297 (2014)
http://dx.doi.org/10.1364/OL.39.001294


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Abstract

By using frequency upconversion detection of terahertz (THz) waves via 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystal with an optimized frequency conversion process, ultrahigh sensitivity has been achieved. Direct comparisons with a 4 K bolometer were implemented. By using a simple positive intrinsic negative (PIN) diode without either electrical amplification or optical amplification, frequency upconversion detection can compete with the commercial 4 K bolometer, while by replacing the PIN diode with an avalanche photo diode (APD), it performs more than three orders better than the 4 K bolometer. Based on power calibration, the minimum detectable THz pulse energy is in the order of 10 aJ (9–25 aJ) at 4.3 THz, with a pulse duration of 6 ns. Thus, the minimum number of THz photons that can be detected is down to the order of 103 at room temperature. The current THz detection system gives a noise equivalent power (NEP) in the order of 100fW/Hz1/2 (50128fW/Hz1/2). Moreover, by switching current optical detectors, the dynamic range is over six orders.

© 2014 Optical Society of America

OCIS Codes
(190.0190) Nonlinear optics : Nonlinear optics
(190.7220) Nonlinear optics : Upconversion
(190.4223) Nonlinear optics : Nonlinear wave mixing

ToC Category:
Nonlinear Optics

History
Original Manuscript: December 5, 2013
Revised Manuscript: January 22, 2014
Manuscript Accepted: January 22, 2014
Published: February 26, 2014

Citation
Feng Qi, Shuzhen Fan, Takashi Notake, Koji Nawata, Takeshi Matsukawa, Yuma Takida, and Hiroaki Minamide, "10 aJ-level sensing of nanosecond pulse below 10 THz by frequency upconversion detection via DAST crystal: more than a 4 K bolometer," Opt. Lett. 39, 1294-1297 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-5-1294


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