A Precision Optical Intracellular Near Field Imaging/Spectroscopy Technology (POINT/NANOPOINT) is a high-resolution instrument for analyzing and comparing molecular characteristics of cells. A nanosensor array is provided which is capable of imaging inner regions of living cells without destroying its natural environment and providing new information about molecular makeup of cells. The POINT probe collects data from high-resolution imagery, providing an imaging tool for investigating cells at sub-cellular and molecular levels. Data are then incorporated into a signature facilitating molecular analysis of diseases. The POINT probe non-invasively penetrates cell membranes to image insides of intact cells allowing the POINT probe to collect data without destroying cell structures. The probe provides cellular imaging to enable the viewing of both imaging and spectroscopy of internal regions of cells. The POINT system may be attached to existing microscopes to achieve a very high resolution.