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There is provided a radiation sensitive refractive index changing composition containing an inorganic oxide particle, a polymerizable compound, a radiation sensitive decomposer and an escapable compound. The radiation sensitive decomposer decomposes upon exposure to radiation to form an acid, base o

There is provided a radiation sensitive refractive index changing composition containing an inorganic oxide particle, a polymerizable compound, a radiation sensitive decomposer and an escapable compound. The radiation sensitive decomposer decomposes upon exposure to radiation to form an acid, base or radical, and this decomposed product increases the molecular weight of the polymerizable compound.

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What is claimed is: 1. A radiation sensitive refractive index changing composition, comprising: (A) an inorganic oxide particle, (B) a polymerizable compound whose cross-linking density is increased by an acid, base or radical, each formed from a radiation sensitive decomposer (C), (C) said radiati

What is claimed is: 1. A radiation sensitive refractive index changing composition, comprising: (A) an inorganic oxide particle, (B) a polymerizable compound whose cross-linking density is increased by an acid, base or radical, each formed from a radiation sensitive decomposer (C), (C) said radiation sensitive decomposer, and (D) 5 to 99 parts by weight of an escapable compound, based on 100 parts by weight of the total components (A) and (B); wherein a film of said radiation sensitive refractive index changing composition exhibits a difference between a refractive index of an unexposed portion and a refractive index of an exposed portion of said film of larger than 0.02. 2. The radiation sensitive refractive index changing composition according to claim 1, wherein the component (C) decomposes upon exposure to radiation to form a decomposed product selected from the group consisting of an acid, a base and a radical, and said decomposed product increases the molecular weight of the component (B). 3. The radiation sensitive refractive index changing composition according to claim 1, wherein said inorganic particle has a particle diameter smaller than the wavelength of light used for the composition. 4. The radiation sensitive refractive index changing composition according to claim 1, wherein said inorganic oxide particle has a particle diameter of 2 μm or less. 5. The radiation sensitive refractive index changing composition according to claim 1, wherein said inorganic oxide particle has a surface modified by a silane coupling agent, a surfactant or a coordination compound having coordination capability to a metal atom of said oxide. 6. The radiation sensitive refractive index changing composition according to claim 1, wherein said component (B) has an ethylenically unsaturated bond, epoxy group, episulfide group, oxetanyl group, oxazolyl group, oxazinyl group or maleimide group, or said component (B) is a polysiloxane having the residual alkoxy group. 7. The radiation sensitive refractive index changing composition according to claim 1, wherein said component (C) is a trichloromethyl-s-triazine, diaryl iodonium salt, triaryl sulfonium salt, quaternary ammonium salt or sulfonic acid ester. 8. The radiation sensitive refractive index changing composition according to claim 1, wherein said component (C) is an optically active carbamate, an amide, an oxime ester, α-aminoacetophenone or cobalt complex. 9. The radiation sensitive refractive index changing composition according to claim 1, wherein said component (C) is an α-diketone, an acyloin ether, a benzophenone, an acetophenone, a quinine, a halogen compound, an acylphosphine oxide or a peroxide. 10. The radiation sensitive refractive index changing composition according to claim 1, wherein said component (D) is a compound which decomposes, sublimes or evaporates to escape through volatilization when it is heated. 11. The radiation sensitive refractive index changing composition according to claim 1, wherein a refractive index of said component (D) is 1.3 to 1.9. 12. A method of forming a refractive index pattern, comprising: applying a refractive index changing composition to a substrate to obtain a coating film, said composition comprising (A) an inorganic oxide particle, (B) a polymerizable compound, (C) a radiation sensitive decomposer, and (D) 5 to 99 parts by weight of an escapable compound, based on 100 parts by weight of the total components (A) and (B), applying radiation to at least part of the coating film, and heating the film to polymerize the polymerizable compound (B) of an exposed portion so as to confine the escapable compound (D) by crosslinking and escape the escapable compound (D) of an unexposed portion. 13. The method according to claim 12, wherein pores are formed in the unexposed portion by the escape of the escapable compound (D) of the unexposed portion through volatilization. 14. A refractive index pattern formed by the method of claim 12 or 13. 15. The refractive index pattern according to claim 14, comprising a first region having or not having pores, and a second region having no pores and a higher refractive index than the first region. 16. An optical material having a refractive index pattern formed by the method of claim 12 or 13. 17. The method according to claim 3, wherein said component (B) is a polymerizable compound whose cross-linking density is increased by an acid, base or radical, each formed from the radiation sensitive decomposer (C). 18. The method according to claim 3, wherein said film exhibits a difference between a refractive index of said unexposed portion and a refractive index of said exposed portion of said film of larger than 0.02. 19. The method according to claim 3, wherein said inorganic oxide particle has a particle diameter of 2 μm or less. 20. The method according to claim 3, wherein a refractive index of said component (D) is 1.3 to 1.9.