Optical manipulation of a lasing microparticle and its application to near-field microspectroscopy

Keiji Sasaki*, Hideki Fujiwara, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticle

26 Scopus citations


A novel probe of a near-field scanning optical microscope (NSOM) is proposed. The probe is composed of a micrometer-sized spherical particle doped with laser dye, that acts as an optical cavity for lasing, and of a nanometer-sized particle attached to the microsphere. The high-intensity evanescent field is generated just outside of the lasing microsphere and scattered with the nm particle, which forms a minute light source for NSOM. Three-dimensional positioning control of the probe is performed with the accuracy of <10 nm by a laser manipulation technique. Photon tunneling from the lasing microsphere to an object was demonstrated as a drastic change of an emission spectrum depending on the microsphere-object distance. The lasing microspherical probe has the advantage of high sensitivity due to intracavity enhancement of the tunneling loss.

Original languageEnglish
Pages (from-to)2786-2790
Number of pages5
JournalJournal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
Issue number6
StatePublished - 1 Nov 1997

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