Prof. Hao Shen Profile

Prof. Hao Shen

at Wuhan Univ

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 20 August 2020 Poster + Presentation

Vortex beam enabled optimization in near-field scanning optical microscopy and possibility in second harmonic generation

Rong Zhou, Hao Shen

Proceedings Volume 11461, 114612V (2020) https://doi.org/10.1117/12.2569001

KEYWORDS: Near field scanning optical microscopy, Harmonic generation, Second-harmonic generation, Polarization, Gold, Nanoparticles, Surface plasmons, Metals, Plasmonics, Semiconducting wafers

Read Abstract +

Metal tip based near-field scanning microcopy (NSOM) has been proved to be a convenient platform for surface plasmonic nano-cavity (SPNC) contributing the extremely high E-field enhancement to sub-nanometer spatial resolved imaging. Although the linear polarized laser illuminated from side with large angle was commonly employed, the unexpected E-field component (parallel to substrate but vertical to tip) was hard to avoid. Alternatively, we focused the vortex laser beam with radial polarization directly to the tip apex from wafer side, and hence we could generate a much purified longitudinal E-field. The consistency of polarization direction inducing gap-mode charge oscillation was otherwise close to 100%. However, the overall “hot-spot” enhancement depended on the balance between mode volume and transmittance. We thus theoretically detailed this issue, leading to the corresponding optimization methodology for the final enhancement. Furthermore, we extended this approach into more general tip-free gap-mode, such as gold nanoparticles on a gold film. Via using SPNC, the Second Harmonic Generation (SHG) from asymmetry boundary could be easily amplified by orders. However, the surface plasmons (SPs) involved nonlinearity were limited by not only symmetry rule, but the eigen-mode of SPs as well. Although the SP based SHG model of single nanoparticle had been well established, the gap-mode induced SP-SHG was rarely reported, as the phase matching and mode matching were challenging to satisfy simultaneously. Taking advantage of vortex beam, we successfully detected the distinguishable SHG signal, and more, realized the mapping imaging.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

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.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

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.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years