Nanorods plasmon-mode wavefunctions

Wavefunction Images of Plasmon Modes of Cold Nanorod — Near-Field Transmission Method... 

Plasmon modes with odd parity characters are dipolar forbidden because no polarization is created upon photo-excitation. Observation of the odd plasmon mode in Fig.4.7d indicates that the optically forbidden mode becomes optically allowed by the local illumination of the near-fleld. It is also noted that observation of the wavefunction image indicates that the coherence of the polarization wave extends from the tip position to the whole area of the nanorod. 

The spatial feature is in excellent agreement with the calculated photonic LDOS at the excitation wavelength. The spatial feature of the image is assigned to the plasmon wavefunction of w = 2 mode. Similarly, a near-tield transmission image taken at 900 nm (Fig. 4.1 Id) is assigned the plasmon wavefunction of w = 1 mode. To examine the ultrafast dynamics in the nanorod, the one-color EPC method was adopted, with near-infrared pulses as the excitation sources. At the excitation wavelength, both the w = 1 and m = 2 modes were excited at the same time. In EPC, the... 

---