Sensitive terahertz-wave detector using a quasi-phase-matched LiNbO3 at room temperature

K. Nawata; T. Notake; H. Ishizuki; F. Qi; Y. Takida; S. Fan; S. Hayashi; T. Taira; H. Minamide

doi:10.1117/12.2051929

1 May 2014 Sensitive terahertz-wave detector using a quasi-phase-matched LiNbO₃ at room temperature

K. Nawata, T. Notake, H. Ishizuki, F. Qi, Y. Takida, S. Fan, S. Hayashi, T. Taira, H. Minamide

Proceedings Volume 9136, Nonlinear Optics and Its Applications VIII; and Quantum Optics III; 913614 (2014) https://doi.org/10.1117/12.2051929
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

Abstract

Sensitive terahertz (THz)-wave sensor at room temperature is crucial for most applications such as 2-dimensional realtime imaging and nonlinear phenomena in semiconductors caused by multi-photon absorption, light-induced ionization, and saturated absorption. LiNbO₃ is a promising material for frequency up- and down-conversion because of its high nonlinearity and high resistance to optical damage. In this report, we propose a slant-stripe-type periodically poled Mg doped LiNbO₃ (PPMgLN) crystal for the construction of a practical THz detector. The PPMgLN solves compromised optical design and low coupling efficiency between THz and infrared (IR) pump beam due to imperfect dichroic coupler. The effective coupling of both pump beam and THz-wave into identical interaction region of up-conversion device promotes the THz detector in practical use. The phase-matched-condition in slant-stripe-type PPMgLN was designed to offer collinear propagation of two optical waves, the pump and up-conversion signal beams, because of efficient frequency conversion. The phase-mached-condition was calculated and a slant-stripe-type PPMgLN with an angle (α) of 20° and a grating period (Λ) of 29.0 μm was used in this experiment. A minimum detectable energy of 0.3 pJ/pulse at the frequency of 1.6 THz was achieved with the pump energy of 1.8 mJ/pulse in room temperature. The dynamic range of the incident THz-wave energy of 60 dB was demonstrated. Further improving for the sensitivity using longer interaction length in a PPMgLN crystal was also investigated.

Citation Download Citation

K. Nawata, T. Notake, H. Ishizuki, F. Qi, Y. Takida, S. Fan, S. Hayashi, T. Taira, and H. Minamide "Sensitive terahertz-wave detector using a quasi-phase-matched LiNbO₃ at room temperature", Proc. SPIE 9136, Nonlinear Optics and Its Applications VIII; and Quantum Optics III, 913614 (1 May 2014); https://doi.org/10.1117/12.2051929

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available