Third-order nonlinearities and structural features in Langmuir-Blodgett films of 1-benzyl-9-hydrofullerene-60

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:437541

Ma, Shihong; Liu, Liying; Lu, Xingze ^[1]

---

1. Fudan Univ., Shanghai (China); and others

Third-order nonlinear susceptibilities {chi}{sub xxxx}{sup (3)} (-3{omega}; {omega}, {omega}, {omega}) have been deduced by measuring third-harmonic generation in Langmuir-Blodgett (LB) films of 1-benzyl-9-hydrofullerene-60 (C{sub 60}-Be). The structural features of the condensed layer at the air-water interface and LB films of the C{sub 60}-Be were investigated by small angle x-ray diffraction (SAXD) and optical measurements. The third-order nonlinear susceptibilities ({chi}{sup (3)}) were obtained by measuring the THG intensities in LB films of C{sub 60}-Be and comparing with that of CS{sub 2} used as the reference. The value of {chi}{sub xxxx}{sup (3)} (2.1 x 10{sup -11} esu) was deduced at a 65 nm thick films. The {chi}{sup (3)} is attributed to a three-photon near resonance at the energy level of 29410 cm{sup -1}. A new-type of two-chain amphiphilic molecule 1,10-bistearyl-4,6,13, 15-tetra-18-nitrogencrown-6 (NC) was used as insert material to construct mixed C{sub 60}-Be/NC LB films. Our {pi}-A, UV-visible absorption and SAXD measurements showed that the structural improvement in the mixed C{sub 60}-Be/NC LB films was realized by insertion of the C{sub 60}-Be molecules between the two hydrophobic chains of the NC molecules.

• OSTI ID: 437541
• Report Number(s): CONF-9509141--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
FULLERENES
HARMONIC GENERATION
MAGNETIC SUSCEPTIBILITY
THIN FILMS
X-RAY DIFFRACTION