Grate 1/2 cucumber into a clean kitchen towel or mesh bag. Squeeze out excess water thoroughly. In a medium mixing bowl, combine 1 cup Greek yogurt, the squeezed cucumber, 1 tablespoon lemon juice, 1 tablespoon light olive oil, 1 teaspoon garlic powder, 1/4 teaspoon salt, and 1 teaspoon dried dill. Mix until well blended and refrigerate until ready to serve.