How to pass bearer token in $window.open url

I am opening the url without authentication using below code,

   $window.open(downloadUrl);

I want to use below authorization

   Authorization': 'Bearer ' + '123hrwertjwtjwjrtr',

i have used below code but it is not working,

    var params = 
 {
   'Authorization': 'Bearer ' + '123hrwertjwtjwjrtr',
   'Content-type': 'application/x-www-form-urlencoded',
 };
var downloadUrl = somedummyurl;
var url = [downloadUrl, $.param(params)].join('?');
$window.open(url);

Can anyone suggest how to add bearer token while calling the api url. In api am using httpget method and used authorize tag..