Light is harnessed by quantum batteries | Technology

Light is harnessed by quantum batteries | Technology
Light is harnessed by quantum batteries | Technology

How is light used to generate energy in quantum batteries?

With new devices that use quantum mechanics to absorb photons more efficiently, your night mode photos may be sharper. The device, called a quantum battery, saves the energy it takes to absorb photons and can recharge them by highlighting them—good news not only for low-light photography on the iPhone, but for solar power, which can use similar technology The same goes for the panels. Capture solar energy faster.

Common dielectrics, such as car batteries, increase proportionally to the size of the battery as it charges. However, quantum mechanical effects make it possible to create systems with energy absorption capabilities that increase rapidly with size. By contrast, it's called superabsorption, allowing researchers to create batteries that charge faster with age.

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Quantum Batteries Technology: Capturing light between Mirror

In the latest study describing scientific progress, James Koch and colleagues at the University of Adelaide in Australia; Politecnico di Milano and the Centre for National Research (CNR) in Italy; and the Universities of St Andrews, Sheffield and Halli Watt in the UK also developed Lumogen-F Orange brand organic pigment molecular battery. These types of mold molecules can be modeled as effective two-layer systems, where the molecule can exist in one of two states: a ground state with minimal energy or an excited state with high energy. When a laser is fired at the correct wavelength, it can absorb a photon and jump into an excited state.

To ensure that the pigment molecules absorb photons efficiently, the researchers suspended them in a non-reactive polymer matrix and placed them in a cavity composed of two mirrors. Because everyday mirrors (glass reflective metal-coated pans) aren't reflective enough to trap photons into the cavity, the team used alternating layers of dielectric to create a device called a distributed Bragg reflector.

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When the laser beam burns in this highly reflective cavity, the photons are absorbed by the pigment molecules and jump into excited states. The energy they absorb can be estimated by sending a probe beam and seeing how well it reflects: Once excited, the molecules can no longer absorb photons, so they are reflected. Therefore, measuring the intensity of the reflected light can tell you how many pigment molecules were stimulated, and how much energy was absorbed by the pigment cell.

Quantum Batteries Technology: The Right Focus

To measure the battery charge rate, the group had to develop ultra-fast measurement techniques for cavity charging and perform the test quickly on the time scale of 10-14 seconds. The researchers also measured the absorption properties of different concentrations of the pigment by keeping the charging force constant. Significantly, the time required to charge cavities with higher pigment densities is reduced, meaning that it takes longer to charge N tiny particles each containing one molecule to charge N particles at one-minute intervals. few. This phenomenon -- a hallmark of superabsorption -- occurs because quantum entanglement between pigment molecules allows them to retain photons better than individual molecules.

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Given these results, one wondered if it was possible to create instantly charged batteries by arbitrarily increasing the pigment concentration to higher levels. Unfortunately, the way the molecules interact, and very high concentrations of light change, keep the cell away from superabsorption. Another disadvantage is that because pigment molecules absorb energy quickly, they release energy quickly. While rapid discharge may be recommended in some applications, such as charging an electric vehicle, it is not ideal for batteries that ideally store energy for long periods of time without damaging the battery.

In this particular case, noise rescue came. If the sound in the device is correct, the absorption-dissipation cycle could be disrupted as excited pigment molecules move into a state called "dark mode", where photon emission is severely affected Great inhibition.

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Quantum Batteries Technology: The camera has a Hole

While the pigment molecules in this test are good at absorbing energy, and you can store quite a bit of energy in the cavity, you need a useful battery to extract energy from the cavity before opening it, for example, in a cell phone or smart phone watch, or take it to a place where it can be stored for an extended period of time. To do this, the team needed to add additional material to the cavity in order to transmit the excitation of the coil in the form of an electrical current. "Currently, the proof-of-principle devices we build are still very small and light to charge, so instant applications have to address this limitation," Koch said. He added that since superabsorption is a common quantum mechanical phenomenon, it may also exist in other systems.

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One of the short-term applications of cavity-based quantum cells is to improve the capture of low-light energy in solar cells and photovoltaic devices used in cameras. However, there is still a lot of work to be done before we can reliably use superabsorbents outside the laboratory. For example, current solar cells and cameras can store energy over a wide range of wavelengths, but the quantum cell demonstrated in this experiment can only absorb light at a certain frequency. Koch said he and his colleagues are optimistic about their ability to expand the system, and they are looking for ways to save and divert energy, with the goal of creating a device that can be easily integrated with existing technology.

Source: Pradeep Niroula, Physicsworld, Direct News 99, Googly Market