I have not specifically looked for modern, but you can try houseplans.com and you can filter your search. Also try a google search for contemporary house plans. I am sure there are multiple sites out there.

I strongly second One Plan's idea about looking for another architect. If this one is not motivated, all the fame in the world is not going to help. An alternative approach to finding an architect is to find some good contractors who have built things you like. Ask them for architects' names. Make sure they work in your price range. In the meantime, you can find out from your local building department what the set back and height restrictions are. Are you required to build parking areas or garage space, what kind of airspace restrictions do you have for neighbors' views and sunlight, that kind of thing. Often this stuff is on city websites or handouts at the office.

When you use the term "Duplex", you mean that it is a two story house, correct ? In the USA, the term "Duplex" means two separate living units side by side......but in other parts of the world it means a two story residence. Please clarily that you are talking about a two story single familly house...... If so, the footprint that your house will have on the ground floor will be approximately 1000 square feet. Do you need to park a car on the site or is parking offsite? If the parking is offsite, then you have lots of room for a two story, 1800 plus square foot house. The design will be dependent on your personal criteria, and it would be helpful if you could hire a local architect to help you with the layout of the rooms. It should be relatively simple once all of the factors are considered.

also plz suggest elivation plan