diff --git a/src/scgenerator/__init__.py b/src/scgenerator/__init__.py
index 32aa692..043be3d 100644
--- a/src/scgenerator/__init__.py
+++ b/src/scgenerator/__init__.py
@@ -1,9 +1,8 @@
-# isort: skip_file
 # ruff: noqa
-from scgenerator import math, operators, plotting
+from scgenerator import io, math, operators, plotting
 from scgenerator.helpers import *
 from scgenerator.math import abs2, argclosest, normalized, span, tspace, wspace
 from scgenerator.parameter import Parameters
 from scgenerator.physics import fiber, materials, plasma, pulse, units
 from scgenerator.physics.units import PlotRange
-from scgenerator.solver import integrate, solve43, SimulationResult
+from scgenerator.solver import SimulationResult, integrate, solve43
diff --git a/src/scgenerator/io.py b/src/scgenerator/io.py
index f682929..152f84a 100644
--- a/src/scgenerator/io.py
+++ b/src/scgenerator/io.py
@@ -1,5 +1,12 @@
 import datetime
 import json
+from pathlib import Path
+
+import pkg_resources
+
+
+def data_file(path: str) -> Path:
+    return Path(pkg_resources.resource_filename("scgenerator", path))
 
 
 class DatetimeEncoder(json.JSONEncoder):
diff --git a/src/scgenerator/physics/fiber.py b/src/scgenerator/physics/fiber.py
index 274e85d..374023b 100644
--- a/src/scgenerator/physics/fiber.py
+++ b/src/scgenerator/physics/fiber.py
@@ -6,7 +6,7 @@ from numpy.fft import fft
 from numpy.polynomial.chebyshev import Chebyshev, cheb2poly
 from scipy.interpolate import interp1d
 
-from scgenerator import utils
+from scgenerator import io
 from scgenerator.math import argclosest, u_nm
 from scgenerator.physics import materials as mat
 from scgenerator.physics import units
@@ -784,13 +784,12 @@ def delayed_raman_t(t: np.ndarray, raman_type: str) -> np.ndarray:
 
     elif raman_type == "measured":
         try:
-            path = utils.Paths.get("hr_t")
-            loaded = np.load(path)
+            file = io.data_file("raman_response.npy")
+            t_stored, hr_arr_stored = np.load(file)
         except FileNotFoundError:
             print("Not able to find the measured Raman response function. Going with agrawal model")
             return delayed_raman_t(t, raman_type="agrawal")
 
-        t_stored, hr_arr_stored = loaded["t"], loaded["hr_arr"]
         hr_arr = interp1d(t_stored, hr_arr_stored, bounds_error=False, fill_value=0)(t)
     else:
         print("invalid raman response function, aborting")
diff --git a/src/scgenerator/utils.py b/src/scgenerator/utils.py
index 4c7b25e..860684f 100644
--- a/src/scgenerator/utils.py
+++ b/src/scgenerator/utils.py
@@ -17,10 +17,10 @@ from string import printable as str_printable
 from typing import Any, Callable, MutableMapping, Sequence, TypeVar, Union
 
 import numpy as np
-import pkg_resources as pkg
 import tomli
 import tomli_w
 
+from scgenerator import io
 from scgenerator.const import PARAM_FN, PARAM_SEPARATOR, SPEC1_FN, Z_FN
 from scgenerator.logger import get_logger
 
@@ -40,54 +40,6 @@ class TimedMessage:
         return False
 
 
-class Paths:
-    _data_files = [
-        "materials.toml",
-        "hr_t.npz",
-        "submit_job_template.txt",
-        "start_worker.sh",
-        "start_head.sh",
-    ]
-
-    paths = {
-        f.split(".")[0]: os.path.abspath(
-            pkg.resource_filename("scgenerator", os.path.join("data", f))
-        )
-        for f in _data_files
-    }
-
-    @classmethod
-    def get(cls, key):
-        if key not in cls.paths:
-            if os.path.exists("paths.toml"):
-                with open("paths.toml", "rb") as file:
-                    paths_dico = tomli.load(file)
-                for k, v in paths_dico.items():
-                    cls.paths[k] = v
-        if key not in cls.paths:
-            get_logger(__name__).info(
-                f"{key} was not found in path index, returning current working directory."
-            )
-            cls.paths[key] = os.getcwd()
-
-        return cls.paths[key]
-
-    @classmethod
-    def gets(cls, key):
-        """returned the specified file as a string"""
-        with open(cls.get(key)) as file:
-            return file.read()
-
-    @classmethod
-    def plot(cls, name):
-        """returns the paths to the specified plot. Used to save new plot
-        example
-        ---------
-        fig.savefig(Paths.plot("figure5.pdf"))
-        """
-        return os.path.join(cls.get("plots"), name)
-
-
 def conform_variable_entry(d) -> list[dict[str, list]]:
     if isinstance(d, MutableMapping):
         d = [{k: v} for k, v in d.items()]
@@ -207,7 +159,7 @@ def load_material_dico(name: str) -> dict[str, Any]:
     ----------
         material_dico : dict
     """
-    return tomli.loads(Paths.gets("materials"))[name]
+    return json.loads(io.data_file("materials.json").read_text())[name]
 
 
 def save_data(data: Union[np.ndarray, MutableMapping], data_dir: Path, file_name: str):