Preheat oven to 400°F (200°C).
In a small saucepan, combine pineapple juice, brown sugar, soy sauce, garlic, and ginger. Bring to a simmer over medium heat, stirring until sugar dissolves and glaze thickens slightly. Remove from heat.
Pat salmon fillets dry and season both sides with salt and black pepper.
Heat olive oil in an oven-safe skillet over medium-high heat. Place salmon fillets skin-side down and sear until the skin is crispy, about 3-4 minutes.
Flip salmon and brush each fillet generously with the pineapple glaze.
Transfer the skillet to the preheated oven and bake for 8-10 minutes, or until salmon is cooked through and flakes easily.
Remove salmon from oven and brush with additional glaze.
Plate salmon fillets centered on white plates. Brush extra glaze on top. Garnish with thin pineapple slices and chopped green onions for a fresh, vibrant finish.