Prepare the dry-rub by combining the Cajun Creole seasoning, garlic powder, cumin, paprika, salt, pepper, and cayenne in a small bowl with a fork.
Place the salmon fillets on a large plate and rub with 1 tablespoon olive oil and the dry rub. Marinate for ~20 minutes.
While the salmon marinates, prepare the Lemon Aioli (directions below).
After the salmon has marinated, turn the broiler on high, line a baking sheet with foil, and drizze a little bit of olive oil on the foil to keep the fish from sticking. Place the salmon filets on the baking sheet and place under the broiler for about 9 minutes until golden on top and moist inside.
Prepare the sandwhiches; spread the aioli on each side of the toasted rolls, add the arugula to the bottom half, place the salmon on top of the arugula, and squeeze the fresh lemon juice over it before putting on the top bun. Enjoy!