Fig. 1. Multifunctional-nanoparticle strategies for combined cancer diagnostics and therapy[23]

Fig. 2. Schematic of conventional optical tweezers-assisted SERS sensing platform[25]

Fig. 3. Construction and operating principle of the nanoplatform stimulated by 800 nm laser for PDT and imaging[34]

Fig. 4. Snapshots of 2D trajectory of fPlas-gold on the microtubule captured by fluorescence microscope[43] (the rose pink circle represents the particle with high-motility, while two yellow circles represent the particles with low-motility

Fig. 5. Cell tracking application by using whispering-gallery mode (WGM) micro-resonators lasers in live cells as marker[53].(a) Confocal image of raw murine macrophage cells; (b) spectrum of a single fluorescent bead at 38 nJ laser pump intensity