Plasmonic photothermal therapy (PPTT) has a rising promise for treating different cancer cells such as lymphoma or stomach cancer. Technique development of PPTT using metallic nanoparticles is developed upon a modification of the irradiation therapy using two major changes: using a less harmful visible amber light (excluding blue light) and using gold-loaded biocompatible nanoparticles. Acrylate nanoparticles were loaded with desired types of gold nanoparticles at different sizes. The gold-loaded gold nanoparticles were conjugated to cancer cells. By selectively delivering the gold nanoparticles into cancer cells, irradiating a harmless amber visible light will achieve thermal ablation of the cancer cells. Based on imaging spectroscopy, flow cytometry, and cell viability assays, results showed reduction of gold-loaded viable cancer cells upon irradiating with amber visible light, no change in the number of cancer cells with irradiating with light only. On the other hand, DNA intercalation of a trinuclear gold(I), [Au(3-CH3,5-COOH)Pz]3 (Au3) is contrasted with the standard organic intercalators ethidium and ellipticine, as investigated computationally. Frontier molecular orbital energies of intercalators and DNA base pairs were determined and found that all intercalators are good electron acceptors with Au3 being the best electron acceptor having the lowest LUMO. DNA base pairs are better electron donors having the lowest HOMO values, and from the intercalators and base pairs' HOMO/LUMO energies, it is evident the intercalators will overlap with the HOMO of DNA stabilizing the intercalators. Interaction energies (kcal/mol) were obtained as a function of distance, r (angstroms). Results show that the theoretical treatment SDD-WB97XD outperforms SDD-LSDA in both adenine-thymine (AT) systems with ethidium and Au3 intercalators. In both guanine-cytosine (GC) and AT pairs, the Au3 has the lowest interaction energies among these common intercalators, suggesting a potential intercalating drug. Experimental DNA intercalation studies were attempted and methods of finding intercalation binding constants were established, showing gold complexes have better binding constants to DNA than common intercalators to support the computational results.