No you can't, because you're increasing the surface are of the collector so the 1.366kWh / square meter still stands.
From Wikipedia:
Average annual solar radiation arriving at the top of the Earth's atmosphere is roughly 1366 W/m2. The Sun's rays are attenuated as they pass through the Atmosphere, leaving maximum normal surface irradiance at approximately 1000 W /m2 at sea level on a clear day.[1]
Therefore it is impossible to get more than about 1kW / m2 from any solar panel. Until such times as something fairly fundamental changes, like a loss of atmosphere or an increase in energy output from the sun.
Well, you're mostly correct; but not technically correct.
From /just/ a solar panel it isn't possible to achieve higher density, however you can use reflectors in the spectrum that your solar panel operates in to increase the energy available for capture at a focal point.
But there's also TheSpiceIsLife's opening comment which says:
> ...you're increasing the surface are of the collector so the 1.366kWh / square meter still stands.
It feels like your second sentence
> ...[H]owever you can use reflectors in the spectrum that your solar panel operates in to increase the energy available for capture at a focal point.
plays rhetorical games by ignoring the existence of large parts of your solar collector (namely the reflectors) in order to arrive at an inflated energy density figure.
From Wikipedia:
Average annual solar radiation arriving at the top of the Earth's atmosphere is roughly 1366 W/m2. The Sun's rays are attenuated as they pass through the Atmosphere, leaving maximum normal surface irradiance at approximately 1000 W /m2 at sea level on a clear day.[1]
Therefore it is impossible to get more than about 1kW / m2 from any solar panel. Until such times as something fairly fundamental changes, like a loss of atmosphere or an increase in energy output from the sun.
1. https://en.wikipedia.org/wiki/Insolation