Common misconception.

http://scienceline.ucsb.edu/getkey.php?key=3971\ "That's a really great question. In fact this question caused a great debate among physicists during the time of Isaac Newton. Newton thought that light was a stream of little particles and other physicists such as Christian Huygens thought that the universe was filled with tiny particles called aether particles and that light was just a wave moving through the aether.

To make a long story short, it turns out they're both kind of wrong... and they're both kind of right. In some situations light sort of acts like a stream of particles and in others it acts sort of like a wave. Today many physicists (myself included) like to say that light is neither a particle or a wave... it's just light.

So, some might say that because light can carry energy from the sun to the earth it must be matter. Others might say that because you can't hold a lump of light in your hand light isn't matter. It all depends on what you mean by the word 'matter.' But the important thing to remember is that light doesn't care what you call it, it will still act the same way no matter what. That's why in physics we try not to worry too much about what things are called and focus on understanding how things actually behave."

https://briankoberlein.com/2014/09/15/calvinball/ "But this isn’t what the double slit experiment actually shows. What it shows is that quantum objects such as electrons are neither particles nor waves. They have particle-like properties and wave-like properties, but their true physical nature can be seen in the mathematical formalism of quantum field theory, where you don’t distinguish between particles and waves. When we set up an experiment to study their particle properties, quantum objects appear as particles. When we study wave properties, we see waves. It isn’t that mysterious when you recognize that quantum objects are simply quantum objects."

http://www.reddit.com/r/askscience/comments/2rrdr2/how_did_the_double_slit_experiment_explain_if/ "UPDATE: As others have mentioned, the more accurate statement is: Light is neither a classical wave nor a classical particle, but is something more complicated which acts in certain ways like a wave and in other ways like a particle, at the same time."

Basically, modalism at best because wave and particles are now just descriptors for how quantum things act. In reality, quantum things like photons don't act as fully particles and fully waves. They are just their own thing.