Method for improved selectivity in photo-activation of molecular agents

A method for the treatment of cancer in plant or animal tissue, the method comprising the steps of:

• (a) treating the plant or animal tissue with at least one photo-active molecular agent, wherein the cancer in the plant or animal tissue retains at least a portion of the at least one photo-active molecular agent;
• and
• (b) treating the plant or animal tissue with light to promote a simultaneous two-photon excitation of at least one of the at least one photo-active molecular agent retained in the cancer in the plant or animal tissue, wherein the at least one photo-active molecular agent becomes photo-activated in the cancer in the plant or animal tissue.

A method for the treatment of a particular volume of plant or animal tissue, the method comprising the steps of:

• (a) treating the plant or animal tissue with at least one photo-active molecular agent, wherein the particular volume of the plant or animal tissue retains at least a portion of the at least one photo-active molecular agent;
• and
• (b) treating the particular volume of the plant or animal tissue with light to promote a simultaneous two-photon excitation of at least one of the at least one photo-active molecular agent retained in the particular volume of the plant or animal tissue, wherein the at least one photo-active molecular agent is excited to a transient virtual level and wherein the at least one excited photo-active molecular agent becomes photo-active in the particular volume of the plant or animal tissue.

A method for the treatment of a particular volume of plant or animal tissue, the tissue including at least one photo-active molecular agent, the method comprising:

• treating said particular volume with light to promote simultaneous two-photon excitation of at least one of said at least one molecular agent so that said at least one excited molecular agent becomes photoactivated in said particular volume at a controllable position.

A method for the treatment of a particular volume of cancerous plant or animal tissue, the tissue including at least one photo-active molecular agent, the method comprising:

• treating said particular volume with light to promote simultaneous two-photon excitation of at least one of said at least one molecular agent so that said at least one excited molecular agent becomes photoactivated in said particular volume at a controllable position.

A method for the treatment of a particular volume of plant or animal tissue, the tissue including at least one photo-active molecular agent in the particular volume, the method comprising:

• illuminating said particular volume of tissue to cause simultaneous two photon excitation (TPE) of at least one of said at least one photo-active molecular agent,
• wherein said at least one photo-active molecular agent at a site of the TPE is excited to a transient virtual level and wherein the at least one excited photo-active molecular agent becomes photo-activated in the particular volume.