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We report novel, unusual effects in sub-λ spinplasmonic media using THz-TDS. THz field shape, amplitude, hysteretic effects, and time delay are sensitive to surface magnetization states and ferromagnetic/non-ferromagnetic (F/N) metallic junctions.

Terahertz plasmonics application in imaging dielectrics embedded in metal-filled media is presented. Signatures of the objects were observed by exploiting the time domain information and the quality of acquired images was enhanced using image processing.

We demonstrate the terahertz frequency plasmonic characteristics of a metallic/semiconductor interface. The high-frequency transmission of terahertz radiation through dense ensembles of subwavelength sized Cu/CuxO microparticles via near-field coupling of localized plasmons is shown to increase when a CuxO/Au or CuxO/Pt interface is introduced. This finding introduces a previously undocumented characteristic of plasmonic interaction with material interfaces, and lays the physical groundwork for the integration of plasmonic circuits with traditional semiconductor electronics.

We present the application of THz plasmonics in imaging dielectric objects embedded in metal-filled media. By exploiting the time domain information from the transmitted pulse, signatures of the objects were observed. To enhance the low quality images acquired through THz time domain spectroscopy, a super-resolution image processing technique was applied. It is shown that pulse arrival time and phase magnitude information compared to the integrated instantaneous power of the transmitted pulse provides more detailed images of the embedded object.