Surface plasmonic cavities consisting of dielectric nanoparticle chains directly placed on a metal substrate are designed and studied. including a periodic nanoparticle chain (copyright) cavity and several different surface plasmon trap (SPT) cavities. The SPT cavities are designed by adjusting the nanoparticle sizes and the spacing between nanoparticles. Among them. https://safeersappliancers.shop/product-category/cooker/