Liquid crystals are substances that flow like a liquid but maintain some of the ordered structure of crystals. Liquid-crystal molecules tend to be elongated and to orient in specific directions. A ...

Photonic crystals are periodic optical structures that can control the flow of light. Multiple reflections from surfaces separated by a distance similar to the wavelength prevent an optical beam from ...

Do you have a question? Tell us what you want to know Get in touch here Crystal Palace boss Oliver Glasner says Brennan Johnson is a "valuable addition to the squad" after signing from Tottenham in a ...

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