Hologram recording material, hologram recording method
A hologram recording material is provided and has at least a silver halide, an organic refractive index-modulating agent, and a binder is provided. The silver halide undergoes sensitization in accordance with interference fringes caused by holographic exposure, to thus form a latent image. Thereafter the silver halide is subjected to a development process to thus develop the thus-sensitized silver halide, thereby causing reaction of the organic refractive index-modulating agent. Hence, the interference fringes formed by refractive index modulation are recorded.
1 . A hologram recording material comprising: a silver halide; an organic agent modulating a refractive index of the hologram recording material; and a binder.
2 . The hologram recording material according to claim 1 , wherein the organic agent is one of:
a coupler capable of modeling a refractive index thereof by means of a coupling reaction with an oxidized form of a developing agent during a development process;
a compound-releasing agent capable of releasing one of a high refractive index compound and a low refractive index compound during a development process;
a polymerizable compound capable of undergoing polymerization during a development process to modulate a refractive index thereof; and
a bubble-generating agent capable of generating bubbles during a development process.
3 . The hologram recording material according to claim 2 , wherein the coupler is a compound represented by formula (1-1) or (1-2):
wherein R 1 and R 2 each independently represents a substituent; R 1 and R 2 may be linked together to form a ring; and X 1 represents a hydrogen atom or a leaving group which can depart as an anion upon coupling reaction with an oxidized form of a developing agent, and
R 3 represents a substituent; a1 represents an integer from 0 to 4; when a1 is 2 or later, a plurality of R 3 's are the same or different from each other and may be linked together to form a rig; and X 2 represents a hydrogen atom or a leaving group which can depart as an anion upon coupling reaction with an oxidized form of a developing agent.
4 . The hologram recording material according to claim 2 , wherein the organic agent is the coupler, and the coupling reaction produces a compound exhibiting no absorption on a hologram recording wavelength.
5 . The hologram recording material according to claim 3 , wherein the leaving group X 1 is a group including a fluorine atom.
6 . The hologram recording material according to claim 3 , wherein the leaving group X 2 is a group including a fluorine atom.
7 . The hologram recording material according to claim 2 , wherein the organic agent is the compound-releasing agent, and the compound-releasing agent is represented by one of formulae (2-1), (2-2) and (2-3):
wherein R 4 represents an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, or a heterocyclic group; R 5 represents an aryl group, or a heterocyclic group; and X 3 represents a releasing group to be released during the developing process,
R 6 represents a substituent a2 is an integer from 0 to 3; when a2 is 2 or larger, a plurality of R 6 's are the same or different from each other and may be linked together to form a ring; and X 4 represents a releasing group to be released during said developing process, and
X 5 and X 6 each independently represents an —H group or an —NHR 16 group, wherein R 16 represents a hydrogen atom, an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, or a heterocyclic group; X 6 represent a substituent and X 6 —SO 2 NH 2 is released during the developing process; R 7 and R 8 each represents a hydrogen atom or a substituent R 7 and R 8 may be linked together to form a ring; and a3 is an integer from 0 to 5; and when a3 is 2 or larger, a plurality of R 7 's are the same of different from each other and a plurality of R 8 's are the same or different from each other.
8 . The hologram recording material according to claim 2 , wherein the organic agent is the polymerizable compound, and the polymerizable compound can modulate a refractive index thereof so that the refractive index modulated differs from that of a binder to form interference fringes in the hologram recording material.
9 . The hologram recording material according to claim 8 , further comprising a polymerization initiator.
10 . The hologram recording material according to claim 2 , wherein the organic agent is the bubble-generating agent, and the bubble-generating agent genetic at least one gas selected from the group consisting of N 2 , CO 2 , SO 2 , SO 3 , NO 2 , O 2 and i-C 4 H 8 .
11 . The hologram research according to clam 2, wherein the bubble-generating agent is a compound represented by one of formulea (3-1) and (3-2):
R 13 —G—R 14 Formual (3-1)
R 15 — N≡N + X 11 − Formual (3-1)
wherein R 13 and R 14 each independently represents a hydrogen atom or a substituent;
G represents —N═N—, —C(O)—, —OC(O)—, —OS(O)—, —S(O) 2 —, or —OS(O) 2 —, and R 13 and R 14 may be linked together to form a ring; and
R 15 represents an aryl group or a heterocyclic group; and X 11 — represents an anion.
12 . The hologram recording material according to claim 1 , wherein the silver halide is subjected to visible-light-spectral sensitization through adsorption of a sensitizing dye.
13 . The hologram recording material according to claim 1 , wherein the silver halide has a number-average equivalent circular diameter of 10 to 80 nm.
14 . A method for recording a hologram in a hologram recording mat according to claim 1 , comprising:
sensitizing the silver halide in accordance with interference fringes caused by holographic exposure, to form a latent image; and
subjecting the hologram recording material to a development process so that the organic agent modulates a reeve index thereof by developing the silver halide sensitized, to form the interference fringes.
15 . The method for recording a hologram according to claim 14 , further comprising:
bleaching silver developed and present in the hologram recording material during or after the development process;
desilvering the hologram recording material to recover the sliver together with the silver halide, which is remained in the hologram recording material, into a processing solution.
16 . A method for recording a hologram in a hologram recording material according to claim 1 , comprising performing a multiple-recording by subjecting the hologram recording material to holographic exposure ten times or more.
17 . The method for recording a hologram according to claim 16 , wherein the multiple-recording is performed under a common exposure amount in each holographic exposure.
18 . The hologram recording mat according to claim 1 , which is for an optical recording medium.
19 . The hologram recording material according to claim 18 , wherein the optical recording medium is a ROM optical recording medium.
20 . The hologram recording material according to claim 18 , which is stored in a light-shielding cartridge during a storage period.
21 . The holographic recording material according to claim 1 , which is for producing a three-dimensional display hologram.
22 . The holographic recording material according to claim 1 , which is for a holographic optical element.