Shudong Jiang

Highly localized photochemical processes in LB films of photo chromic material by using a photon scanning tunneling microscope

Abstract A highly localized evanescent light from a fiber probe with a 100 nm diameter aperture of a photon scanning tunneling microscope (PSTM) was used to realize localized photochemical processes in LB films of photochromic material. The localized photochemical processed region sized as small as 130 nm was obtained by using the transmission type PSTM.

A photon scanning tunneling microscope using an AlGaAs laser

A novel super-resolution photon scanning tunneling microscope (PSTM) using diode lasers and optical fibers was demonstrated to measure the samples with submicron structure in a noncontact and nondestructive manner. A reproducible method for fabrication of the fiber probe with the tip curvature radius of 80 nm is reported. The step with the height of 9 nm, optical disk with submicron-sized pits similar to moth-eye structure, and latex particles with 80 nm in diameter have been observed. To the best of our knowledge, this is the smallest particle size resolved by the PSTM.

Nanometric Scale Biosample Observation Using a Photon Scanning Tunneling Microscope

A T4 bacteriophage with a tail diameter of about 9 nm was observed for the first time in an atmospheric condition without a metal film coating, by means of a superresolution photon scanning tunneling microscope (PSTM) using a fiber probe. Fiber probes with cone angles of 25°-100° and their minimum curvature radii less than 10 nm were fabricated andthe angle variance was less than 0.5°. The normal resolution of such a PSTM was evaluated to be less than 1 nm, and the lateral resolution, limited by the curvature radius of the fiber probe, was estimated to be within 20 nm.

Nanometer Resolution Photon STM and Single Atom Manipulation

A photon STM was constructed by using a sharpened optical fiber with a radius of curvature of about 1 nm. Nanometer-resolution was achieved to measure biological and other kinds of samples with sub-micron structures. We also proposed a new method to trap a single neutral atom in the evanescent field localized near the fiber probe top.

Reflection-Resonance-Type Photon Scanning Tunneling Microscope

A novel reflection-resonance-type photon scanning tunneling microscope is proposed to measure the sub-wavelength sample profile by detecting the resonant frequency shifts of a probe cavity. Simulation experiments were carried out to confirm the effectiveness of the present proposal and the theoretical estimation shows that the shot-noise-limited lateral resolution as high as 2.3×10-3λ can be expected.