Electro-optic polymer

An electro-optic polymer (EO polymer) comprising an electro-optic molecule (EO molecule) and a base polymer, the EO molecule having a structure in which a π-electron donor and a π-electron acceptor are conjugated via a π-conjugation bridge,

• the EO polymer having an electro-optic coefficient (EO coefficient) of 30 pm/V or more and a figure of merit (FOM) of 10×10−6 cm/dBV or more in an entire optical communication wavelength range of 1260 nm to 1625 nm,
• the FOM being defined by the following formula:
• FOM
• =
• n
• 3
• ⁢
• r
• a
• max
• ⁢
• λ
• ⁡
• [
• 1
• ⁢
• 0
• -
• 6
• ⁢
• ⁢
• cm
• ⁢
• /
• ⁢
• dBV
• ]
• [
• Math
• .
• ⁢
• 1
• ]
• wherein n indicates a refractive index, r indicates an EO coefficient, amax indicates a maximum absorption coefficient in a wavelength range of interest, and λ indicates a wavelength,
• wherein the EO molecule is a compound represented by the following formula (1):
• wherein
• RD1a, RD2a, and RD3a independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aryloxy group, an aralkyloxy group, a silyloxy group, an alkenyloxy group, an alkynyloxy group, a hydroxy group, —R1—OH wherein R1 is a hydrocarbon group, —OR2—OH wherein R2 is a hydrocarbon group, —OC(═O)R3 wherein R3 is a hydrocarbon group, an amino group, —R4—NH2 wherein R4 is a hydrocarbon group, a thiol group, —R5—SH wherein R5 is a hydrocarbon group, —NCO, or —R6—NCO wherein R6 is a hydrocarbon group, and RD1a, RD2a, and RD3a each may have one or more identical or different substituents;
• RD4a and RD5a independently represent a hydrogen atom, an alkyl group, a haloalkyl group, an acyloxyalkyl group, a silyloxyalkyl group, —R1—OH wherein R1 is a hydrocarbon group, —R4—NH2 wherein R4 is a hydrocarbon group, an aryl group, —R5—SH wherein R5 is a hydrocarbon group, or —R6—NCO wherein R6 is a hydrocarbon group, and RD4a and RD5a each may have one or more identical or different substituents;
• X represents a linking group;
• RA1a and RA2a independently represent a hydrogen atom, an alkyl group, an alkenyl group, a cycloalkyl group, a cycloalkenyl group, an alkoxy group, an aryl group, a hydroxy group, —R1—OH wherein R1 is a hydrocarbon group, —OR2—OH wherein R2 is a hydrocarbon group, an amino group, —R4—NH2 wherein R4 is a hydrocarbon group, a thiol group, —R5—SH wherein R5 is a hydrocarbon group, —NCO, or —R6—NCO wherein R6 is a hydrocarbon group, and RA1a and RA2a each may have one or more identical or different substituents, and
• at least one of RA1a and RA2a is a substituent selected from the group consisting of an aryl group having a halogen atom, an aryl group having a haloalkyl group, and an aryl group having an aryl group optionally having a halogen atom;
• and
• wherein X in formula (1) is represented by the following formula (B-I)
• wherein
• RB1 and RB2 independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, an alkenyl group, a cycloalkyl group, a cycloalkenyl group, a haloalkyl group, an aralkyl group, an aryloxy group, an aralkyloxy group, a hydroxy group, —R1—OH wherein R1 is a hydrocarbon group, —OR2—OH wherein R2 is a hydrocarbon group, an amino group, —R4—NH2 wherein R4 is a hydrocarbon group, a thiol group, —R5—SH wherein R5 is a hydrocarbon group, —NCO, or —R6—NCO wherein R6 is a hydrocarbon group, RB1 and RB2 each may have one or more identical or different substituents, and RB1 and RB2 may form a ring together with the two carbon atoms to which they are bound,
• π1 and π2 are each a structure represented by the following formula (B-IV):
• wherein n represents an integer of 1.