Smart dust refers to tiny, wireless sensor systems that can monitor and transmit data about their environment. First conceptualized by Kristofer Pister in 1997, smart dust systems consist of self-assembling, self-orienting photonic crystals made of porous silicon, offering immense potential for applications in healthcare, defense, and environmental monitoring. These sensors can detect light, temperature, vibration, and chemical changes. However, their miniaturization raises concerns about privac