1. A multi-channel drop filter using a photonic crystal, comprising:
a bus waveguide formed in a photonic crystal;
at least one drop waveguide arranged substantially perpendicular to the bus waveguide; and
at least one resonator arranged between the bus waveguide and the drop waveguide to independently filter light having a desired wavelength among light of various wavelengths guided along the bus waveguide to the desired drop waveguide.
2. The multi-channel drop filter according to claim 1, wherein the bus waveguide and the drop waveguide are formed by line defects.
3. The multi-channel drop filter according to claim 1, wherein the resonator is formed by point defects.
4. The multi-channel drop filter according to claim 2, wherein the resonator is formed by point defects.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of preparing a functionalized polymer, the method comprising:
providing a living polymer;
reacting the living polymer with a functionalized epoxide compound defined by the formula
where R1 and R2 are each independently a monovalent organic group, R3 is a divalent organic group, R5, R6, and R7 each independently include a monovalent organic group or a hydrogen atom, \u03b8 is a Group 14 element, and \u03bb includes a leaving group or an addition group, to form a precursor including an epoxide group; and
reacting the precursor with a diamine to form a polymer including a primary amine group, where the diamine is defined by the formula
where R8 and R9 each independently include a monovalent organic group or a hydrogen atom, and R4 includes a divalent organic group or a covalent bond.
2. The method of claim 1, where each leaving group is independently selected from the group consisting of halides, thioalkoxides, alkoxides, dialkylamines, and mixtures thereof.
3. The method of claim 1, where a molar excess of functionalized epoxide compound to the living polymer is employed in said reacting living polymer with an epoxide compound.
4. The method of claim 3, where a molar excess of diamine to the precursor is employed in said reacting the precursor with a diamine.
5. The method of claim 1, where the diamine is selected from the group consisting of hexamethylenediamine, p-phenylenediamine, 1,4-diaminobutane, 1,4-diaminocyclohexane, 1,2-diaminocyclohexane, 1,3-diaminocyclohexane, 4-hydrazinobenzoic acid, and 2-hydrazino-2-imidazoline.