A cylindrical metal tapered probe with a periodic sub-wavelength groove is studied in this paper. The surface plasmon polaritons (SPPs) is supported by periodic ring grooves on the surface of the metal line. To achieve enhancement of the electric field, the tapered tip is used to focus the surface waves tightly. The affection of the sub-wavelength microstructure parameters on the transmission loss and the enhancement factor of the electric field are compared. When the frequency of the electromagnetic field is low, the loss of the periodic grooved metal line negative correlates with the groove depth and width but positive correlates with the radius and the period. As the frequency increases, the correlation between the transmission loss of the metal line and the groove depth, width, radius, and the period reverse. Similar to the loss of the metal line, the field enhancement factor of the probe tip is also vulnerable to the frequency of the electromagnetic field. The field enhancement factor of the probe tip increases as the period decreases when the electromagnetic field frequency is low. In contrast, the field enhancement factor of the probe tip declines as the period decreases as the frequency increases. However, the field enhancement factor of the tip positive correlates with the groove depth and width but negative with the radius in the whole passband. The simulation result prove the feasibility of the proposed method and pave the way for the development of low-loss, miniaturized, low background noise, and high-focus electric field enhancement factor terahertz near-field probes.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
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.