Polarization characteristics of terahertz wave generated by differential frequency mixing under exciton excitation condition in a semiconductor quantum well (Conference Presentation)

Osamu Kojima

doi:10.1117/12.2319185

18 September 2018 Polarization characteristics of terahertz wave generated by differential frequency mixing under exciton excitation condition in a semiconductor quantum well (Conference Presentation)

Osamu Kojima

Author Affiliations +

Proceedings Volume 10756, Terahertz Emitters, Receivers, and Applications IX; 1075608 (2018) https://doi.org/10.1117/12.2319185
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

As continuous wave (CW) terahertz (THz) sources, the differential-frequency-mixing (DFM) has an advantage for the frequency tunability by changing the energy separation of the two lasers. In particular, considering the inhomogeneous width in the quantum conﬁnement systems, use of the exciton lines enables wide frequency tuning. The THz sources with the narrow bandwidth and wide frequency tunability will be applied to the high resolution THz spectroscopy. Recently, we realized the CW-THz wave generation by DFM under the exciton excitation conditions in a GaAs/AlAs multiple quantum well (MQW), which shows the wide frequency tuning range over 18 THz. Therefore, in this work, we report the polarization characteristics of a continuous THz electromagnetic wave generated by DFM due to excitation of two exciton states in the GaAs/AlAs multiple quantum well. As a sample, we used an undoped GaAs/AlAs MQW embedded in a p-i-n structure on a (001) n+-GaAs substrate. The thickness of GaAs and AlAs layer is 7.5 nm. The measurements of the THz wave were carried out at 296 K. As the laser sources, a semiconductor laser and a CW-mode Ti:sapphire laser to change the excitation energy were used. The two beams were focused on the sample surface. Comparing the polarization of the laser beams with that of the THz wave, the conversion process from the laser lights to the THz wave via the exciton states, such as the heavy hole and light hole excitons split by quantum confined effects, will be demonstrated.

Conference Presentation

Citation Download Citation

Osamu Kojima "Polarization characteristics of terahertz wave generated by differential frequency mixing under exciton excitation condition in a semiconductor quantum well (Conference Presentation)", Proc. SPIE 10756, Terahertz Emitters, Receivers, and Applications IX, 1075608 (18 September 2018); https://doi.org/10.1117/12.2319185

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Terahertz radiation

Excitons

Polarization

Quantum wells

Semiconductors

Design for manufacturing

Continuous wave operation

Show All Keywords

Keywords/Phrases

Search In:

Publication Years