Tip-enhanced thermal expansion and dipole interaction in tip-sample geometry (Conference Presentation)

Junghoon Jahng

doi:10.1117/12.2291603

14 March 2018 Tip-enhanced thermal expansion and dipole interaction in tip-sample geometry (Conference Presentation)

Junghoon Jahng

Proceedings Volume 10549, Complex Light and Optical Forces XII; 1054910 (2018) https://doi.org/10.1117/12.2291603
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

When the light is illuminated to the tip-sample geometry, the thermal and the dipole responses are simultaneously created. Each of the response shows exactly different spectral behavior. The thermal response shows non-dispersive spectrum because of its absorptivity but the dipole response shows dispersive spectra because it is based on the refractive index. There is an interesting debating in this field by developing the photo-induced force microscopy (PiFM). The PiFM measures the force interaction between the sharp metal tip and the sample under a light illumination condition. Because both of the thermal and the dipole interaction may be contributed to the system, the origin of the chemical selectivity of the PiFM is not clear. Here, we address that the origin of PiFM is contributed by both of the thermal and the dipole response but they can be distinguished with respect to their experimental conditions: pulse width, sample size and tip size. We provide the rigorous theoretical modeling and experimental demonstration. Our understanding can be extend to the recent advances of the opto-mechanical nanoscopy and spectroscopy such as Photo-induced force microscopy, Photothermal infrared microscope (PTIR) and the Peak force infrared microscope (PFIR). We suggest the general theory to understand these opto-mechanical microscopy by using simple effective stiffness concept. Finally we provide the experimental demonstration for the each of the chemical imaging mode.

Conference Presentation

Citation Download Citation

Junghoon Jahng "Tip-enhanced thermal expansion and dipole interaction in tip-sample geometry (Conference Presentation)", Proc. SPIE 10549, Complex Light and Optical Forces XII, 1054910 (14 March 2018); https://doi.org/10.1117/12.2291603

ACCESS THE FULL ARTICLE

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