A team of engineers from the University of California San Diego have fabricated what they claim to be the first semiconductor-free, optically-controlled microelectronic device. Using metamaterials, they built a microscale device that shows a 1,000 percent increase in conductivity when activated by low voltage and a low power laser. This discovery paves the way for microelectronic devices that are faster and capable of handling more power, and could also lead to more efficient solar panels.
The capabilities of existing microelectronic devices, such as transistors, are ultimately limited by the properties of their constituent materials, such as their semiconductors. For example, semiconductors can impose limits on a device's conductivity, or electron flow. Semiconductors have what's called a band gap, meaning they require a boost of external energy to get electrons to flow through them. And electron velocity is limited, since electrons are constantly colliding with atoms as they flow through the semiconductor.
The team led by electrical engineering professor Dan Sievenpiper at UC San Diego sought to remove these roadblocks to conductivity by replacing semiconductors with free electrons in space. And they wanted to do this at the microscale. However, liberating electrons from materials is challenging. It either requires applying high voltages (at least 100 Volts), high power lasers or extremely high temperatures (more than 1,000 degrees Fahrenheit), which aren't practical in micro and nanoscale electronic devices.
To address this challenge, the team fabricated a microscale device that can release electrons from a material without such extreme requirements. The device consists of an engineered surface, called a metasurface, on top of a silicon wafer, with a layer of silicon dioxide in between. The metasurface consists of an array of gold mushroom-like nanostructures on an array of parallel gold strips.
The gold metasurface is designed such that when a low DC voltage (under 10 Volts) and a low power infrared laser are both applied, the metasurface generates "hot spots" - spots with a high intensity electric field - that provide enough energy to pull electrons out from the metal and liberate them into space. Tests on the device showed a 1,000 percent change in conductivity.
This certainly won't replace all semiconductor devices, but it may be the best approach for certain specialty applications, such as very high frequencies or high power devices.
According to researchers, this particular metasurface was designed as a proof-of-concept. Different metasurfaces will need to be designed and optimized for different types of microelectronic devices.
Now they need to understand how far these devices can be scaled and the limits of their performance. The team is also exploring other applications for this technology besides electronics, such as photochemistry, photocatalysis, enabling new kinds of photovoltaic devices or environmental applications. Read the paper that talks about this research.
