Abstract

Terahertz (THz) radiation characteristics have been investigated for voltage-biased photoswitching devices (PSDs) coupled with dipole antennas made on magnetoresistive Pr0.7Ca0.3MnO3 thin films. Even under a fixed illumination of femtosecond laser pulses with a power of 14μJcm2, we find the high electric strength in PSDs made on Pr0.7Ca0.3MnO3 thin films in the charge-ordered (CO) state at 10K. THz radiation linearly enhances with an increase of the biased electric field up to 400kVcm without any change of the waveform of the radiated THz pulse. On the other hand, the static time-averaged photoconductance is nearly constant below 200kVcm but deviates from it above 200kVcm. Such behavior can be ascribed to an increase in the change of the fraction of photogenerated metallic patches within the CO insulating phase. Therefore our findings show that not only Pr0.7Ca0.3MnO3 but also other manganites having a CO state above room temperature may act as efficient THz radiation sources.

© 2006 Optical Society of America

Full Article  |  PDF Article

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 (4)

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