Honey I Shrunk the Robot: Breakthrough in Microscopic Actuators with Potential Applications in Healthcare

 Jonah Diaz

Professor John Horgan
HST 401-A

26 January 2026

Honey I Shrunk the Robot: Breakthrough in Microscopic Actuators with Potential Applications in Healthcare

Nothing frustrates me more than dimensioning components pertaining to an engineering design concept. Naturally, it would be reasonable to optimize the design’s GDT (geometric dimensioning and tolerancing) based on a set of parameters such as performance and efficiency, but you’ll find that the real world presents its own arsenal of constraints to hinder or compromise any “ideal design.” A group of peers and myself had designed a robotic hand which we felt would perform its directed set of tasks optimally and this had been further validated through a series of simulations and analyses run. However, it was to our team’s utter dread that we realized that this design could not be realized as any viable actuation method would make the design unwieldy cumbersome, lacked the necessary deliverable power or could not fit within the structure. While solutions did exist (i.e. designing our own motor/servo), it was due to the scope of its expense and lack of manufacturability that we ultimately chose to abandon said design. Our current design is still in the works and much more progress is required before anticipated success may be culminated. 

This leads on to how much of a punch in the gut it was when I see a grandiose display of Chinese developed anthropomorphic robotic end-effectors (hands, claws, etc) that had overcome and superseded the very actuator size constraints our group had been struggling with. The demonstrations highlighted the several degrees of freedom the robotic hands possessed while also being highly dynamic, responsive and precise. Of even greater caliber was a set of articles detailing the technology of laser-driven actuators in microbots with respective photovoltaic (solar-cell) receptors for activation and control. What shocked me the most was not the actuation method itself but the fact that the respective microrobots are in the micron size range (30-40 µm with current developments), and thus, are thinner than the human hair (Paridon, 2024). 

Surprisingly, this technological breakthrough is not as relatively “new” as one may presume with its origins dating to 2019 where Caltech researchers cited the possibility of using laser-activated microrobots to carry and deliver medication for tumor treatment with minimal invasibility (Caltech, 2019). The researchers also developed rudimentary prototypes of their suggested design but with many technological limitations with respect to its practicality. However, it must be noted that the laser only activated the release of the medication and that the microbot itself only performed the actions of environmental perceptions and could not be precisely actuated within its environment. 

The advent of 2020 began to present viability in the implementation of laser based actuation as it could now be controlled in 2 dimensions with a remarkable degree of control and precision (Miskin, 2020). Photons from the laser source are directed to an array of silicon photovoltaic cells which then selectively deliver electrical signals to different robotic appendages for controlled motion. The appendages themselves are constructed of platinum which expand when ionized and contract when not. Despite major breakthroughs in shrinking the technology and with improving the actuation/control methods, the microrobots lack the ability of autonomous control. The laser actuation and control systems remain independent and external to the dependent microrobot system. Constructing complex silicon circuits capable of performing autonomous tasks at the given scale are currently unfeasible as current technological capabilities stand. 











References

Paridon, B. van. (2024, July 5). Tiny robots with a big impact: Scientists develop microrobots for single-cell handling - Advanced Science News. Advanced Science News. https://www.advancedsciencenews.com/tiny-robots-with-a-big-impact-scientists-develop-microrobots-for-single-cell-handling/ ‌

Microrobots Activated by Laser Pulses Show Promise For Treating Tumors. (2019). California Institute of Technology. https://www.caltech.edu/about/news/microrobots-activated-laser-pulses-show-promise-treating-tumors 

Miskin, M. Z., Cortese, A. J., Dorsey, K., Esposito, E. P., Reynolds, M. F., Liu, Q., Cao, M., Muller, D. A., McEuen, P. L., & Cohen, I. (2020). Electronically integrated, mass-manufactured, microscopic robots. Nature, 584(7822), 557–561. https://doi.org/10.1038/s41586-020-2626-9 ‌

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