Confined photocarrier transport in InAs pyramidal quantum dots via terahertz time-domain spectroscopy | Zendy

Jorge Michael M. Presto | Zendy; Elizabeth Ann Prieto | Zendy; Karim M. Omambac | Zendy; Jessica Afalla | Zendy; Deborah Anne Lumantas | Zendy; Arnel Salvador | Zendy; Armando Somintac | Zendy; Elmer Estacio | Zendy; Kohji Yamamoto | Zendy; Masahiko Tani | Zendy

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Confined photocarrier transport in InAs pyramidal quantum dots via terahertz time-domain spectroscopy

Author(s) -

Jorge Michael M. Presto,

Elizabeth Ann Prieto,

Karim M. Omambac,

Jessica Afalla,

Deborah Anne Lumantas,

Arnel Salvador,

Armando Somintac,

Elmer Estacio,

Kohji Yamamoto,

Masahiko Tani

Publication year - 2015

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.23.014532

Subject(s) - terahertz radiation , quantum dot , materials science , spectroscopy , terahertz time domain spectroscopy , optoelectronics , excitation , terahertz spectroscopy and technology , dipole , wavelength , optics , physics , quantum mechanics

We present experimental demonstration of photocarrier dynamics in InAs quantum dots (QDs) via terahertz (THz) time-domain spectroscopy (TDS) using two excitation wavelengths and observing the magnetic field polarity characteristics of the THz signal. The InAs QDs was grown using standard Stranski-Krastanow technique on semi-insulating GaAs substrate. Excitation pump at 800 nm- and 910 nm-wavelength were used to distinguish THz emission from the InAs/GaAs matrix and InAs respectively. THz-TDS at 800 nm pump revealed intense THz emission comparable to a bulk p-InAs. For 910 nm pump, the THz emission generally weakened and upon applying external magnetic field of opposite polarities, the THz time-domain plot exhibited anomalous phase-shifting. This was attributed to the possible current-surge associated with the permanent dipole in the QD.

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