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

Full Article  |  PDF Article
OSA Recommended Articles
Optical detection of terahertz using nonlinear parametric upconversion

M. Jalal Khan, Jerry C. Chen, and Sumanth Kaushik
Opt. Lett. 33(23) 2725-2727 (2008)

Efficient terahertz detection in a sheet cavity using a nonlinear optical parametric process

Kyosuke Saito, Tadao Tanabe, and Yutaka Oyama
Appl. Opt. 54(17) 5475-5480 (2015)

Optical detection of terahertz radiation by using nonlinear parametric upconversion

M. Jalal Khan, Jerry C. Chen, and Sumanth Kaushik
Opt. Lett. 32(22) 3248-3250 (2007)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (3)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription